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The 68 J and F code heads show to be the same in my information. I think it was Bruce Sizemore that ran an H/MP Maverick that held the class record for a while during the 70s. Edelbrock heads are available in two different versions, with either 1.94- or 2.02-inch intake valves. The Cleveland style head featured a staggered, canted valve arrangement. 2.02/1.60 in Valves. 125 of gap at the front and rear ends and you are running a blower or a turbo then I would suggest making some spacers to take up the gap on the ends because anything over. Boss 302 blocks are used all the time for Windsor headed performance buildups! JavaScript is disabled. There was a guy named CJ Batten who would cut up 3 boss 302 heads and put them on a 300 IL6.The one I remember was on in a rail type dragster. Generator stud kit for 1938-48, use #8506. . Thanks to all who helped us get here. it still has the vista 7 sticker on the palm rest area. Australian car enthusiast with 30 years experience in the high performance industry. Edlebrock is one of the few companies making great performance parts for small block Fords. These features improve an engines efficiency, resulting in more horsepower and torque and improved mileage potential. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Aluminum. 20 Best Cycling Shorts For Long Distance (2023 Updated), 20 Best Cylinder Lock For Storage Unit (2023 Updated), 20 Best Treats For Guinea Pigs (2023 Updated), 20 Best Treats For Goldendoodle Puppy (2023 Updated), 20 Best Treats For Golden Retrievers (2023 Updated), 20 Best Treats For German Shepherd (2023 Updated), 1953 Ford Customline 8 Cylinders 3.9L 2BL. I was trying to find a set of heads that will produce 300ish hp. Even the stock cam should peek higher than 5500 rpm. Age Group: adult. Aluminum heads are affordable, lighter and will make more power. I was actually pleasantly surprised at the swirl polished valves and the large spring pockets for if you want to run larger springs with a monster cam! This combo has been dynod at 460-ish hp at 5000 rpm and 550 ft lbs of torque at 2000 rpm. I would suggest pulling the vavles and wiping everything down. 60 cc Chamber. THE FIRST SET I PURCHASED WERE LIKE THIS AND I INSTALLED WITHOUT CHECKING THEM. Both engines feature a four-inch bore and three-inch stroke, so there are no excuses available for either side regarding minor discrepancies in displacement. Not to mention the 50lbs you lose off the front. These heads use the same valves, valve springs, retainers, and 7/16 in. Small Block Ford. . The connection with metered networks (or connecting to your phones hotspot) appear to deteriorate over time, and causes this error. The result of this engineering effort was the BOSS 302 engine, which became the Trans Am mill of choice for 1969-70 and beyond in SCCA competition. Feb 19, 2016. The power numbers are so close that if we had tested these heads in a typical street car, it's doubtful we would have seen much of a difference in performance among the middle four heads. Enzo Ferrari, and others, were handed their backsides. Low mileage 440 from an RV, Hughes Whiplash cam and lifters, E-Street heads and RPM intake topped with a Quick Fuel Brawler 850 double pumper. These are perfect for the low compression big blocks of the mid to late 70s. FORD 5.0L/302 Cylinder Heads. Otherwise, pair these with some flat top pistons with the correct valve reliefs. And you'd have to replace the factory two-piece valves which are known to come apart randomly for no reason. I was wondering how these heads would work on my 97 5. Cross Boss 302 Mustang off highway use. Pic 3 shows what looks like an area of casting slag that was missed when they were cutting and cleaning out the valve seats and runner. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Expensive mistake. The intake valves all have. 1.90/1.60 in Valves. It was 351C heads, 3 of them, cut up into 6 pieces, then furnanced blazed. Does anyone remember the six cylinder heads they made for Bruce Sizemore. 035 (which I am using). However, there are a few notable differences between the Coyote in the F-150 and the Coyote in the Mustang. Where in the world did you come up with the "347s are not reliable"?. 030 AND 2 OF THEM WERE. I have certificate for it. Plus we used cam dial-in and it was only off a half degree. The runners are as cast and a bit rough. 1.90/1.60 in Valves. Currently I have a set of 1969 302 d0oe heads, and a set of 1965 289 heads, I heard both of those won't do it without spending a lot of money porting etcI was thinking of gt40 heads. Above you see a casting with a D1ZE part number. Ford New Boss 302 w/351C HDS Hex Head Stud Kit. Edelbrock E-Street cylinder heads are ideal for entry level street performance engines. Since the Windsor block was already a thing, the Blue Oval team decided to fit a set of Cleveland style heads to the short-block and create the Boss 302. Neither was really that streetable but of the two the 70 had the smaller valves whick helped a little with the low rpm feel. Click to expand. Cylinder Head. I expected cleanup, but not like this. Cylinder heads casting ID decode for 260 289 302 351 390 406 427 428 429 460FE Boss Shelby. When I set the carb I get a bouncing vacum needle at idle, Ive been told thats a sign of a sticking valve. In 1970 the Boss 302 was a Camaro killer, it could go 0-60 mph in 6.0 seconds. 351C 4V heads (same as Boss 302 heads except where the water exits the head) are really overkill a street motor. 22-25 Ft/Lbs - Iron Heads. To pull this off, we needed a durable mule, so we chose Ford Racing's Boss 302 345-hp crate engine that comes with a set of aluminum heads actuated by a .480-inch lift B303 hydraulic. Ford engineers took the new 351 cylinder head and modified it to work with the Tunnel Port block. The only caveat to all this is that the Twisted Wedge heads do limit valve lift (0.600 inch) and duration on stock pistons due to their repositioned intake valvejust so you know. the second head had not been full deburred from the milling process. The Ford roller rockers use a fulcrum base and a 5/16-inch bolt to attach the rockers to the head. . I think it was based on the Cleveland design. This educational content is not intended to be a substitute for professional advice. from United States. Do 302 cylinder heads increase RPM? That would probably have been the only intake available to work , at that time. To conceive the BOSS 302, Ford had to develop a special forged piston with a significant dome that would reach deep into the 351C heads 64 67cc chambers. 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When the SCCA started the Trans-Am series. Gurney Eagle : Gurney Eagle race heads : Application. This has been done and is generally called a Clevor (using Cleveland heads on a SBF). Both companies decided to develop a 302 combination via the previously mentioned four-inch bore and three-inch stroke. And torque is what gets the car moving from a stop, pushing you back in the seat. Besides the hemi-style heads themselves, the benefits of this new setup are many: For instance, a deck thickness of 0.7 inch to encourage safe use of power-adders, and full water jackets for proper cooling. Classes? They use a Cleveland style quench chamber and standard 302 Boss/351 Boss/351C/351 SVO valve train parts (will accept 2.19"/1.71" valves). We had a grad student at UMR custom design his own crossflow head for that engine and the entire thing was CNC'd from one piece of aluminum. writing. Also, the visual aesthetic is pretty plain, and the laptop doesnt have a sleek feel to it. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! The 4-bolt caps can be seen here. Plus, they give you more power behind the wheel and in your wallet! The RHS heads come out of the box with a very nice-looking casting, and back that image up with respectable performance. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4in. The brute 427 FE Series big block that won Le Mans also reigned supreme in limited production 1964 Thunderbolt Fairlanes in NHRA competition. After its time on the pump, the DZ 302 posted 357 horsepower at 6,700 rpm and 333 lb-ft of torque at 4,300 rpm. Recently, we posted an article in which Richard Holdener dyno tested the five-liter powerhouses put out by the Blue Oval and the General in the 1980s. 1969 mustang fastback boss 429 351 race car front end. 030 shim. Top Rated Seller Top Rated Seller. It collects next to nothing. I have used them for over 35 years and never seen something like this. Maximum output for less money!. We used Comp roller rockers for the remaining heads to level the playing field, but if you are considering a set of these heads, be aware that the rockers and fulcrums need to be considered as well. RHS shipped the heads with what should have been a sufficient single 1.460-inch-diameter valvespring, but the horsepower graph reveals that above 5,800 rpm the power trailed off, leading us to think that perhaps with a better spring this head could have carried the power out beyond 6,000 rpm, which would have improved its peak horsepower number. That tradition dates back to the companys founding in 1903. Huge difference in quality. How can you call it racing if you're putting the brakes on before the finish line? Did you get them at a Chevy garage sale? Much of this gain over the stock 345-hp Boss 302 rating can be attributed to Westech's lower 140-degree engine coolant test procedure and open dyno headers. I didnt and I think some of that lube got burned on the valve seat and causing it to not seal but, will have to open it up to find that out. The Edelbrock E-Street cylinder heads offer American made quality and affordable performance. However, it is generally agreed that aftermarket cylinder heads can provide significant performance gains, and that aluminum heads are often the best choice for racing applications. So, a big head, lots of camshaft, an aluminum intake, and a Holley four-barrel. The Boss 302 and 351C-4V head casting are the same except for a minor difference in water passages. Put on a 351w in a 1979 Tbird. These heads are always perfect, but could use a little bowl work thanks team SUMMIT. ENGINE BLOCKS . A stock Boss head will support way over 500 horsepower, where the Chevy will struggle at 400 horsepower. They had problems with the 69 heads..made some changes in 70 and won the Trans Am races.So 70 or 71 heads are the better heads. These heads are really impressive!!!!!! Im trying to leave this pretty much as is, until I get a few good drives in. Not true! Bought these and compared to the other (PC). edelbrock. I called AFR about the problem and their only suggestion is to install a crankcase vacuum pump. We got our answer. Evidently youre research people are either misinformed, or just dont really care about building anything ford. AFR - Airflow . After a couple of good seasons of running competitively with the big blocks a couple of guys showed up with a custom head that consisted of two V-8 Ford heads that had a combustion chamber removed from each end and were furnace bronzed together in the middle. The intake is off a 1965 Shellby. loading. You can see how the valves are canted in this picture. Though I rated the overall part as good, the areas that really count are just average. unfortunately I missed the return window due to illness. If we've muddied the waters a bit, it's only the result delivering more information on the way to a decision. Moving to the Blue Oval, we see that they went with a milder profile. Absolutely no complaints, tons of flow and tons of fun. I think Im in love, lol!!. If you had the right pistons, you could use 351C 2V heads which are cheap and plentiful and don't have the low end port velocity issues 22GT described. Turbo 300-inch Ford can bang off 10.90s at 120 mph. I work in IT, so I know a good laptop/PC when I use one. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. 02 intake/1. it boots up ok but not as fast as my other i5 laptop. The block is a 1980 302 Winsor. 302 (may have been used on late 68 model year) 4V . I remember reading about it in some magazine and I saw it on another forum recently. Depends on material old school rubber gets lube, the Polytetrafluoroethylene rubber gos on dry. Seems to me that if you get the right kit (ie correct wrist pin centering, rod length, etc), you should have no problem.. aliases: Bossssssman, bosscars, old fart, chat dawg, hey you. ported and polished heads can also provide good results, but they may require more work to install and tune properly. 546hp @5600 rpm also had 630 ft-lbs torq@ 4400 rpm. http://forums.vintage-mustang.com/vintage-mustang-forum/721154-1970-mach-1-h-code-build.html. for use w/ Special Intake. Jeff Speegle Come see us @ ConcoursMustang.com MCA Shelby Judge, SAAC & Team Shelby Judge (in no particular order . AIR FLOW RESEARCH 1402 SBF 165cc Alum Heads Renegade Street 58cc. A guy near here used the advice on the link below, starting with a 67 289 2V engine. If you are looking for a set of World aluminum heads, you can find them at Bill Mitchell Products. Fords great success with its powerful V8 engines is legendary. Sizemore, formerly of Preperation H fame, did considerable valvetrain developement and terrorized the former checvvy stronghold of I and J/Gas. Every time I put a bigger carb on it, it ran faster. Some of the guys were running ford 300 six cylinders with good success. I was going to have my reconnecting rods reconditioned with 5/16 arp bolts. Will these heads work well?. They are also cast with combustion I SENT THEM RIGHT BACK. This could easily cause a hot edge and create premature detonation of the charge. I really liked my 69 428 CJ. Whoever invented that crap ought to be shot. I think the higher RPM one had larger valvesand ports, right? The advantage was better flow because the intake was on one side and the exhaust was on the other. These are perfect for their intended use, the street. Max effort class rule stuff runs over $2K. Other Intakes >> Application. If ultimate power is not the most important point, then you could easily choose any of these heads and make a good decision. The cylinder head is bolted to the engine block and sits above the pistons. The Mustang 5.0L Coyote Engine Gen 1, Gen 2 & Gen 3 differences are explained by Landan with LMR. It was rated at 10.5:1 compression and 230 bhp (Shelby was rated at 250). you need custom pistons, boss intake, boss heads, boss pushrods, custom headers for a 65-66 mustang, 69-70 b2 headers for 67-70 mustang. one of the hotrod magazines did an article on the combo back in the 70's. At RHP reasonably well ported (340+ / 200) set of iron heads with large S/S valves, manganese bronze guides, p/c seals, rocker studs and guideplates are $1,695 exchange. FORD MUSTANG 302 CYLINDER HEADS Pre-Owned $177.50 classicautoresto (4,195) 100% or Best Offer +$199.05 shipping Sponsored ARP 154-4206 Black Ford New Boss 302 w/351C heads 12pt hsk In Stock Ready to Ship Best Deals Fast Shipping Brand New $250.99 partshawk (68,956) 99% List price: $367.99 32% off Buy It Now Free 4 day shipping Sponsored Think of Ford as a free-spirited car company with a rich history, driven by ego, that took big risks much as it is doing today with electric vehicles. SB Ford WP Man O'War iron block/Man O'War aluminum head Head Bolt Kit. If weight is a consideration, keep in mind that these iron castings weigh considerably more than the rest of the aluminum heads. 1970 Fastback (to be finished outside as a Boss 302 tribute), thanks for all the responces! document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Peak power was good, at 349 hp, and torque is also reasonable. To minimize the grief of doing the math yourself, we averaged the horsepower between 3,000 and 6,000 rpm, then divided that into the cost of a pair of heads. The rocker studs are 7/16, not 3/8. First of all. my signature linesnot really directed at anyone in particular.. Exhaust - 1.72 inches. Stroking an engine is not going to reduce your engine rpm. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. in 1969 with Doug Durham and me ,TED FORDMAN EHRHARDT who took a new Boss 302 short block apart and checked all specs. Sign up for a free trial to MotorTrend+ today. Won't work with the 289 stroke. The heads are awesome and fit great! The F code 302-2V was made from 68-73. Roush? The wide and large port heads with staggered valve placement give the 302 H.O. Your email address will not be published. 302/351 X2 Head. 1 on Pg 2 instructs the used to drill 3 holes if a 400 block is used. Ive had several other brands, but HP has been the best. That may or may not make your ultimate choice any easier, but if so, you can thank us later. Edelbrock E-Street cylinder heads are just the ticket. Alum. JavaScript is disabled. The supplied ones are generic and poor fitting. Basically, the DZ 302 shared all the specs with the previous 365-horsepower 327, with the fuelie heads, the Duntov cam, an aluminum intake, and Holley carb. Not all that long ago, the small-block fan's only choice for Ford cylinder heads was the classic 351W Ford heads swap on a 302. The .10 difference in bore spacing( but the bolt pattern is the same square four as the smallblock) makes me think 3. Small Block Ford. With such great success under its seat belt, Ford decided to dabble with the 289 and stroked 302 to see what could be done to further its performance image. Combine Edelbrock quality with excellent power and a highly competitive price, and the E-Street Edelbrock heads strike us as an excellent choice. Sold individually. Great velocity with these heads. They have cast iron seats and guides (titanium valve compatible) and are set up for studs and guide plates. A recent test of a prototype set of Hammerhead's castings bolted on a 427ci small-block stroker produced over 600 hp with a streetable hydraulic roller camshaft and 600 lb-ft of torque. Sign up for a free trial to MotorTrend+ today and start watching every episode of Engine Masters, plus much more! 045. Marvin Shaw built us some nice HP heads for our later 1989 Super Stock Mustang driven by Charlie Ford who set 1/8th mile record under 6 seconds in 89/90 . The push-rods needed to be extended using a 2-piece design w/a small aluminum sleeve (that slides in the block) to join the 2 pushrods. If we were going to use these heads on a street engine, we'd disassemble them and spend the extra bucks to add a 30-degree back-cut to the intake and exhaust valves to improve their overall flow. I was building that garbage in 2nd grade. The cam featured 290 degrees duration and .477 in (12.1 mm) of lift. second time I have been disappointed with Edelbrock. For the Boss 351, the entire Cleveland engine was used instead of simply the heads. Henry Ford II wasnt going to have it any other way. Well, I got about 500 miles on the engine now and couldnt be happier about the build. Ive built 302/347 engines with stock heads, Roush180/Windsor Jr. , and Trick Flow Twisted Wedge heads. Ford Aftermarket. It was a world beater and symbolic of the end of the classic muscle car era. They feature revised valve angles and locations to reduce cylinder wall shrouding and improve flow, along with redesigned combustion chambers to accommodate the more centrally located valves. All in all, Im not a fan of this series from Dell. I was still only available with the special 302ci 290 hp high output engine. They pull much harder through the midrange than the 351W heads they replaced on my 302 Ford. [The Boss] cylinder head came about after Fords experience with the tunnel port cylinder head where they learned lots of head flow equals lots of power, Holdener relates. Aluminum will allow you 1pt up in compression for its ability to shed heat. The Edelbrock heads showed a little weakness in the midrange, something that could probably be rectified by adding a 30-degree back-cut to the intake valve. Im not sure what has happened to Edelbrock, but their quality control sucks. Autozone has a great price on these heads. I passed over a different set of heads at the recommendation of my machinist. After spending an hour on the Edlebrock Tech line we determined the instructions are out of date relative to the current product being delivered of the 5073 head. The cylinder head also contains the spark plug and fuel injector(s). We discovered this was a 1969-70 BOSS 302 head modified for use on a 351C. Just my thought. They show to be suitable for the 221-302 Ford Small Block. which will help take the wait off the rear main bearing. It's all bracket racing. I purchased these because I needed some better than stock, but not full out race heads. They will outperform many of the average aluminum heads. For the testing, Holdener put together a non-numbers matching replica of the DZ 302. There was also drill flash from the machining of the bores for the valve guides and spark plugs. These all-cast heads are designed for hydraulic flat tappet and hydraulic roller cam engines with hefty intake runners, stainless steel valves, Viton seals, and dual springs. However, it also led to a lot of upset Bowtie fans for some reason. Renegade Street. That puts lift over .500 inch .514 according to our calculations, minus the lash, Holdener reveals. It's important to note that this was the only head in our test that required its own separate valvetrain. My build is a 306, 9. These heads are coated with assembly lube out of the box. Something is very wrong with this, a blueprinted stocker should be in the 375-400 HP range. The 306-horse 289 cubic inch High Performance small-block V-8 in Shelby GT350s took on Corvette and the rest and managed to spank Americas sports car in SCCA competition. I am through with their products. High-Quality Details With the Edelbrock part #7129 Performer RPM E-Boss 302 intake manifold, you can build a mock Boss engine by using a standard 302 block and Edelbrock Performer RPM Cleveland cylinder heads #61699. Throw a blue oval flag over the RHS, Edelbrock, and Ford heads, and the performance is very similar. . It was honestly a guess on my part and the Tech had no additional information or opinion to offer. This page last updated: February 3, 2022. Topping off the Boss 302 was a specially designed aluminum dual-plane intake manifold mounting a 780-CFM Holley four-barrel carburetor, covered by a closed air cleaner assembly with a single inlet snorkel and a ribbed, domed lid that was also chrome-plated. When the vacuum is high, the intake is sucking oil through the valves. For Use w/289/302/351 Windsor-Style Engines. http://fordsix.com/forum/viewtopic.php?t=33048, 1971 Ford Maverick - Budget 10-Second Turbocharged Maverick Coupe - Car Craft Magazine. Bob Perkins(WI) located it and restored it to original shape and build special plexiglass trailer for it to display. I installed these on a factory 302 HO in my 94 Mustang. The 300 and the 240 are identical blocks,the heads are different and the 240 is basically a destroked 300 so it will rev a little higher. 1970 Intake - 2.19 inches Exhaust - 1.72 inches. E-Street cylinder heads feature as-cast ports and are designed for entry-level street performance applications operating in the idle-to-5500 rpm range. Great bang for your buck with these heads. Original aluminum Boss 302 valve cover brackets for the spark . . So, instead, they ran a simple 750cfm Holley carburetor, along with 1-3/4-inch dyno headers. 154-4207: Ford Racing Aluminum Valve Covers, Part # M-6582-Z351, SS, 12pt . If it is, then you know what you need to do. Any who, this is a work laptop, and it started out pretty fast, but over time, it eventually slowed down. Street 512 Mopar motor in a Dodge Dart . And, he decided to make that happen. Because the 302 Tunnel Port called for high revs in the 9,000 rpm range to make real power, racers scattered these engines all over racetracks across the country and left feeling defeated. At idle when vacuum is the highest the valve guides leak lots of oil into the intake. If I wasnt on a time crunch, I would have returned these heads. One thing I found particularly awesome about these heads is the spark plug holes and threads. To pull this off, we needed a durable mule, so we chose Ford Racing's Boss 302 345-hp crate engine that comes with a set of aluminum heads actuated by a 0.480-inch lift B303 hydraulic roller cam, and 9.0:1 compression. But, I just came across this website and happened to ask about B. Sizemor's 6. D. Hearne is on the money as usual. 1969 Heads are sold individually. Ford Racing's Z heads (PN M-6049-Z304DA, 63cc chamber, 2.02-inch intake valve, $1,695) are the next step in bolt-on performance castings for small-block Ford engines that see street and on-track . Truth is, a factory original Boss 302 is happiest with a 600 to 650 cfm Holley. The less you know the more you need vacuum secondarys. You may also cruise the online auctions for a vintage 5.0L roller block (F1AZ-6010-B). Cylinder Head 190cc Assembled. It came with aluminum heads that were way too big for the cam and my use. but thesell work on a large engine and flow, too. What I have found out so far, the engine runs. These are perfect for a street build and the price is outstanding!!. Whenever youre running a flat tappet cam, always use a zinc additive, Building Classic Ford 351 Cleveland Power. Keep the RPMs under 5,500 and valve lift is more like. Today's small-block Ford street engine builder has it easy. The BOSS 302 engine could use better cylinder heads with right-size port and valve sizing in a set of Trick Flow cylinder heads and a more compatible roller mechanical camshaft. We'll squeeze all of this into these few short pages, which means we have a long way to go and a short time to get there. I recommend purchasing ARP studs and guideplates for perfect rocker alignment. The Twisted Wedge heads also had the strongest horsepower curve above 4,000 rpm of all the heads tested. disappointed discovering this situation. OK, you can do pretty well on a budget. When it comes to the valve events, Ford and Chevrolet took two different approaches. So get comfortable, slip on your Ford-colored glasses, and hang on. Flat cylinder heads have large water capacity and excellent breathing characteristics. Fords classic 1969-70 BOSS 302 engine was a bold step forward after a miserable season in 1968. "Basically, the DZ 302 shared all the specs with the previous 365-horsepower 327, with the fuelie heads, the Duntov cam, an aluminum intake, and Holley carb. 1.290 in Spring. if you have over. It should be in the product description and specs. Pontiac was the outlaw division. Other than that it was OK. I would guess Im somewhere around 375HP @ the flywheel in this build. Don't know if it's still good. Twisted Wedge and Canted valve (TFS and C302b) in aluminum promote even better performance. Cylinder heads are available fully assembled or as bare castings. GT40 heads use 1.84 intake / 1.54 exhaust. and if you want to use a high-lift cam or supercharger; thats no problem, either. As the 1968 Tunnel Port engine turned into a disaster, someone at Ford Engine Engineering got the idea to put a set of Cleveland heads on a Tunnel Port block and thus was the beginning of what would become the BOSS 302 engine. As you can see from these numbers, the Cleveland-style Boss 302 cylinder heads offer significantly more airflow at each valve opening point over the DZ 302's fuelie heads. detroit metro auto parts "302" - craigslist. The Fora platform includes forum software by XenForo. No drilling is required since it appears they updated the manufacturing process to eliminate this need. The Mustang 5.0L Coyote engine has evolved into the Boss 302, VooDoo 5.2L, and the Predator 5.2L. No stick hole up top. Both engines are solid flat tappet cams, and the Chevy especially responded to changes in the lash. To complete the Boss, we added an Edelbrock Performer RPM intake, a Holley 750-cfm, mechanical-secondary HP carb, MSD distributor, and a set of open dyno exhaust headers, and we were ready to rumble. For those who consider swirl a detriment to producing power this is a positive thing. Find Parts and Accessories Boss 302 aluminum heads KEYWORD and get Free Shipping on Orders Over $99 at Summit Racing! The Ford heads did well during the testing, making a peak of 362 hp. 98 sold legend . They dont flow as well as some of the more expensive options available but they flow way better than OEM cast iron heads. Outperform many more expensive parts.