Stage 2 heads

[Reggie West]

Sorry turbobitt I thought you were Norbs. My apologies.

 

[norbs]

Sorry turbobitt I thought you were Norbs. My apologies.

He drives his car, I don;t you can;t confuse the both of us! Mike, I will look into your numbers..You really need to take backpresure readings on your turbo to see where you stand..

 

[turbobitt]

Sorry turbobitt I thought you were Norbs. My apologies.

No worries, long winter.
AG.

 

[turbobitt]

I drove Terry Houston's Stage 2 headed street car. It was a 4.1, 3.4 stroke, 8:1 compression, stage 2 heads, 76 Q-trim .85 3 bolt (old 11 blade Q), TH400 with a Precision converter probably a 0 pump, 218/218 solid roller. It had as much bottom end if not more than my old 245" 109. It spooled the 76 way faster and started making boost lower rpm. Now at 26psi, it went 10.20@136, where my old 109 went 9.86@138 on 23psi. At the time we both had 76GTQ turbos and I was running a 0 pump Vigilante 5disc in a 2004r.

I agree on Your assessment but with this exception, when I had an old t-netics 76mm 11 blade Q-trim with .96 A/R I was able to spool it very fast as well. But I was also able to get down in the 9.80's about 12 years ago at about 20 psi boost on a bad tune and on DOT's. This was with the same 242 cam I was running for a while. I never pushed that combo to its full potential.
AG

 

[bison]

I agree on Your assessment but with this exception, when I had an old t-netics 76mm 11 blade Q-trim with .96 A/R I was able to spool it very fast as well. But I was also able to get down in the 9.80's about 12 years ago at about 20 psi boost on a bad tune and on DOT's. This was with the same 242 cam I was running for a while. I never pushed that combo to its full potential.
AG

That was with an on center pos housing and converter slip way higher than we'd ever see today too.

 

[forcefed3.8's]

There were other issues with the car. It was running a stock MAS, which I am sure was costing some power, the valve springs were probably whopped, but at the time my valves were floating too, the car wouldn't 60'. I am just sharing my experience on the stage 2 heads having no bottom end. I thought the car drove and acted no different than a production headed car. There was alot more in the car no doubt. The guy who owned it was a friend of mine. He wouldn't listen on how to tune it, wouldn't spend any money on making it right. His mind set was it is a built stage 2 car, it is bulletproof. After 3 sets of headgaskets, 2 ruined cranks, and many popping, misfiring wot blasts, he gave up. He was determined on it being faster than my car. He is the guy that makes our cars seem like headaches.

 

[norbs]

Once I find my HP book, Ill put the math to show the rpm where the port dimensions , come to life.

Looks like its 10,000 RPM for a 231 ci motor and its 8800 rpm for a 274 CU motor..will be the maximum rpm before the stage II port dimensions start to LIMIT HP. To sum things up you need RPM to make these things works...

 

[turbobitt]

Once I find my HP book, Ill put the math to show the rpm where the port dimensions , come to life..

Who cares about math. Show us the dyno results !!!!!
AG.

 

[norbs]

Who cares about math. Show us the dyno results !!!!!
AG.

I agree with you but, I'm still dealing with family issues, and we have seen a recovery in my dads condition, which is good news!

 

[turbobitt]

I agree with you but, I'm still dealing with family issues, and we have seen a recovery in my dads condition, which is good news!

I know, Believe me when I say I'm just trying to be a positive motivator. Good to hear about your Dad.
AG.

 

[norbs]

I came across this Mcfarland calculation...It shows for a 231 cu motor with a port area of S II head 2.776 sqin. peak torque will occur around 6359 RPM........So if your thinking 3000-4000 rpm its physically not possible to make gobs of TQ.

http://hotrodenginetech.com/porting-pointers/

 

[rag231]

What's the port area of an unported stage 2 head? That calculation would no doubt drop the rpm peak torque number a bit.

 

[norbs]

What's the port area of an unported stage 2 head? That calculation would no doubt drop the rpm peak torque number a bit.

I just used the gasket dimensions in the power source book.. I would have to go measure a set of un ported heads which I have in stock.