Thread: Big block head help

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I have a 427 69' camaro it's got edelbrock performer oval ports with semi open chambers and 10.7 comp. I want more and was thinking about11.5 to 12.5 to ones... but can I ??? Is there a company that makes these pistons ? Will these heads support that much comp ? The car see very little street time and I don't have a problem running race fuel, Thanks guys

J E SRP makes a endelbrock dome piston so they could make them$$ i would look more in to getting it out to 496 with a roller cam and pump fuel if looking for more punch .427 can run good i really do not know what you just abit more is ? do not think you will see much on one point for the add cost for the fuel and pistons

The car has been 10.20 with a two stage nitrous setup 150 first stage, 250 on second stage, I'd like it to go 10.50's or faster without the bottle. It has a hydraulic roller already, If I have to buy new heads I guess I can sell the old ones. I would hate to have to buy a new crank and rods, It already has a forged crank and h-beams. Is it really worth that much going to a 496?

The car has been 10.20's on a two stage 250 shot, well I would like to see it run around that fast with no power adders. It already has a roller cam and all the right parts to go fast I just wonder if these heads will let me go faster without the spray. I would really like to stay with the 427 only because a good chunk of money was spent on the rest of the bottom end and to have that stuff just sitting around would suck. Is the differance that great to move up to a 496 or 489 ?

Originally Posted by Bee's69camaro

The car has been 10.20's on a two stage 250 shot, well I would like to see it run around that fast with no power adders. It already has a roller cam and all the right parts to go fast I just wonder if these heads will let me go faster without the spray. I would really like to stay with the 427 only because a good chunk of money was spent on the rest of the bottom end and to have that stuff just sitting around would suck. Is the differance that great to move up to a 496 or 489 ?

yes your talking more CID like 69 more even one hp per cube69 hp more that is not hard to do more like a 100 hp over your build and the TQ would go up to it could be hard to get 10.20 even with your old parts on a 496 part s combo could be off for no shot on engine

So if I were to go with a 496 what compression and heads would you suggest to reach my goal ?

I Need More Info Every Thing Cam Carb Cfm Intake Weigth Of Car Trans Gear Header Size All That And I May Look In To It If You Want Me To Pm Me With Every Thing And If Your Ever Going To Spray The 496

Originally Posted by Bee's69camaro

So if I were to go with a 496 what compression and heads would you suggest to reach my goal ?

with them heads they only look like 12.5 cr is what they make in a srp i would be looking at more cr

It's a 69 camaro that's back halved with 486 gears on a 31 in tire a 400 trans with a brake and a 3800 conv it currently has a 595 lift 324 dur cam plus 1.8 roller rockers but I was planning on changing the cam a holley 4150 hp 950 carb -10 fuel lines with aeromotive pump and reg msd digital 6 ign and distributor 2" primary headers with 3" collectors and 3" exh

12.5, Is that with the heads I currently have?

Originally Posted by Bee's69camaro

12.5, Is that with the heads I currently have?

that would be with a 496 and your head you can look it up on srp i do not think you can get that much with the 427 you would need a custom dome