[hemi joe]

i just ordered a set of iron eagle s/s cast iron heads part#10024364a 165/76cc.are these ok as a replacement for a mild street build.1987 caprice 5.7L/350 roller block.

[my87Z]

yea they should be fine. they will give you some added power at the fact that they will flow a bit better than the stock heads, but they wont wow anyone. i'm guessing nothing else has been done to the motor. i would think that this motor would do a little better with a smaller combustion chamber to raise the compression ratio up just a bit, but as it is you pretty much are taking off a set of 76cc heads and putting another 76cc head on it, but like i said ealier the dart heads will flow a bit better, do you have any other plans for this motor

[hemi joe]

hi 87z,yes i have a comp-cam part#08-408-8 that i'am going to install,along with edelbrock performer intake.i will be using my stock q-jet.i have a new double roller timming chain,and new harmonic balancer,self align.alum roller rockers.just looking for a mild street performer.any info you can give me is really apreciated.also new push rods.

[killerformula]

Those heads will give you good throttle response for that large car. Your cam will work well with the heads, and if you really want to up the street performance, take a look into rear gears and a stall converter. You're only talking a few hundred in parts and the return will really be rewarding-

K

[hemi joe]

thanks for the responce,the rear gears are in the works as we speak.i have a 2500 stall converter in the car now.trans is a 700R4 completley rebuilt with shift kit.

[454C10]

roller blocks with stock pistons were set up for vortec heads. Vortec heads have 64cc chambers. 76 cc chamber will drop compression by a lot.

9.5:1cr 350 with 64cc heads will drop to 8.5:1cr with 76cc heads. Not too low for your cam but not ideal either.

Should have ordered the 64cc chambered iron eagles to maintain stock compression.

[hemi joe]

thanks for the reply,i never thought about that.

[my87Z]

Originally Posted by 454C10

roller blocks with stock pistons were set up for vortec heads. Vortec heads have 64cc chambers. 76 cc chamber will drop compression by a lot.

9.5:1cr 350 with 64cc heads will drop to 8.5:1cr with 76cc heads. Not too low for your cam but not ideal either.

Should have ordered the 64cc chambered iron eagles to maintain stock compression.

not in 1987!

[454C10]

Originally Posted by my87Z

not in 1987!

he says he has a "roller block" in his 87, so one could assume it isn't a 87 block.

[my87Z]

Originally Posted by 454C10

he says he has a "roller block" in his 87, so one could assume it isn't a 87 block.

i can see that, but they did make and use roller blocks in 87'. but i also know from some of Hemi Joe's previous questions that it is the factory block from 87', and that we exlained to him one way to tell if it is a roller block with out tearing down too much was to pull a push rod out and messure it. he found that they were the 7.195" roller pushrods.

[hemi joe]

just to clear any questions,i don't have vortec heads but i do have 64cc heads.

[hemi joe]

thank you 87z you are correct on my previous posts,do you think the 76cc will work with my present set-up.or should i have went with another set of heads.i value your thoughts.

[my87Z]

Originally Posted by hemi joe

thank you 87z you are correct on my previous posts,do you think the 76cc will work with my present set-up.or should i have went with another set of heads.i value your thoughts.

if you do in fact have 64cc heads on the engine now then the 76cc heads will lower the compression ratio by a bit over 1point, say you have 8.5:1 now with 64cc heads then with the 76cc heads it would be closer to 7.3:1 and any gain from the better flow and velocity from the iron eagle heads will be lost by the lowered compression. i originally thought that you had the typicall 70s-80s 76cc heads on there and that is why i said it would help but if this is not true then my best advice would be to sell them and buy a set of RHS pro torkers (the vortecs) RHS makes them so that they fit both the non vortec and the vortec bolt patern intake manifolds. these would be a great improvment and you can't beat the price either at 750ish a pair.

[hemi joe]

update,after recieving ideas from members here i have decided to go with the RHS12410K1 pro torker vortecs.with that being said my question is will they work with edelbrock performer intake.part#3706,rhs says will work with early and late model intakes.i'am just asking has anyone used this set-up..thanks joe.

[built4speed]

Originally Posted by 454C10

9.5:1cr 350 with 64cc heads will drop to 8.5:1cr with 76cc heads. Not too low for your cam but not ideal either.

Blower time