Thread: 6-71 supercharged 302 help needed

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I am not sure about what cam to use, but I figured on keeping the compression ratio in the 8:1 - 8.5:1 range. I have heard that this is an ideal range for a blown engine. Do you have any suggestions on a camshaft?

Originally Posted by V8juggernaut

I am not sure about what cam to use, but I figured on keeping the compression ratio in the 8:1 - 8.5:1 range. I have heard that this is an ideal range for a blown engine. Do you have any suggestions on a camshaft?

I would either run a cam that has 112 or 114 lobe seperation.
You would need to run 10 degree's more exhaust duration.

just fill the block part way and go ahve fun with it. if it blows salvage the internals and start over

No way I would consider that much boost on a stock Windsor block!!!! Investing a lot of money that a lot of which is going to get blown out the side when the block breaks!!!!!! Much as I love my Blue Ovals, I wouldn't consider even putting a blower on anything other then one of the SVT blocks....even then I'm not sure you could run enough boost without risking a major blow up to justify the expense.... The blocks are just way too week on the bottom end, if you go with the splayed caps and or main cap supports then it will split right down the valley......

Originally Posted by Dave Severson

No way I would consider that much boost on a stock Windsor block!!!! Investing a lot of money that a lot of which is going to get blown out the side when the block breaks!!!!!! Much as I love my Blue Ovals, I wouldn't consider even putting a blower on anything other then one of the SVT blocks....even then I'm not sure you could run enough boost without risking a major blow up to justify the expense.... The blocks are just way too week on the bottom end, if you go with the splayed caps and or main cap supports then it will split right down the valley......

What Dave says here times two.
Been there done that to many times.

well you guys can stick with your blue ovals. i'll stick with my bow ties. a buddy of mine built a mustang II cobra 4 banger car into a 302 car by changing a bunch of parts and alot of $$$ where gm just drop in a V8 with a th350 and go, even the 7.5 rearends hold up to V8 abuse.

Originally Posted by speedy55779

well you guys can stick with your blue ovals. i'll stick with my bow ties. a buddy of mine built a mustang II cobra 4 banger car into a 302 car by changing a bunch of parts and alot of $$$ where gm just drop in a V8 with a th350 and go, even the 7.5 rearends hold up to V8 abuse.

The 7.5 rear ends might hold up a little while, but as soon as you make that car "hook" you may just shove the spider gears through the rear cover.
We us to break these 7.5 ring gears with about 375 lbs. of torque and a 9 inch wide slick.

Originally Posted by erik erikson

The 7.5 rear ends might hold up a little while, but as soon as you make that car "hook" you may just shove the spider gears through the rear cover.
We us to break these 7.5 ring gears with about 375 lbs. of torque and a 9 inch wide slick.

seen many break not that hot of a rear end not chevy best the old 10 bolt is much better

Originally Posted by pat mccarthy

seen many break not that hot of a rear end not chevy best the old 10 bolt is much better

I think I broke one I had in a 86 Camaro now that I think about it.

Originally Posted by erik erikson

I think I broke one I had in a 86 Camaro now that I think about it.

Erik you would know when you break one ! The Tow bill is a good reminder There is a guy at the track with a FORD 8.8 rear end . But the COOL thing it's in a 1984 G body Monte Carlo with a SB Chevy 383 .

My only experience with a supercharger was on a tiny 1300 cc VW with a positive displacement vane-type Judson compressor. So far nobody has said anything about heat. For a 10-12 second run in the quarter mile this may be the least of worries but reading the original beginning of this thread he says only occasional drag use with probably a street cruiser use most of the time. Adding 30% more fuel-air mixture means 30% more heat. In my case it meant a melted piston while on a trip from Virginia to Florida and two trips to emergency garage service to get home. The first stop was to replace the melted piston but the VW mechanic did us a favor by washing down the engine with Varsol. The second stop was about 90 miles up the road when the combination of engine heat and Varsol melted the wiring loom. Amazingly the second stop at another VW agency only cost us $12 for the complete engine wiring loom (plus meals and another night's lodging!) For regular running of a supercharged engine probably lower psi is adviseable for longer engine life and forged pistons would seem to be a good idea but don't forget provision for extra cooling too!

Don Shillady
Retired Scientist/teen rodder

It is what it is ! Twin Turbos ? You still need the HD 302 block . You can build one of the 5.0 GT40 long blocks to make good power for a street / strip build with one carb . And yes it will Smoke the tires .

I know what you mean Stovens, I have the typical hot rodder's dilemma: I want the "go", but my budget is low.

I have found a reasonably priced twin turbo setup that might be cool. But by the sounds of things, I probably won't be able to use my "stock" block for that either. I don't mind doing mods to the engine to be able to run either one of these (blower or turbos), but apparently, my block won't handle it. Guess I won't get my HP fix until I win the lottery.

Just how much are the custom blocks?

Originally Posted by stovens

Just how much are the custom blocks?

A new HD Bare block is around $2200 to $2400 Bucks . I would check your local Craigs list and E Bay for a HD block . With all them Fox Mustang 5.0 guys . There must be some good HD used blocks or even short blocks .