1 BLOWN V8

iTrader: (17)

Hey all:

First I am in California so I have to stay within the smog laws. I am not worried about visual just passing the sniffer. With all my mods and a great tune by Jeff Creech I passed with no problem with all my mods in my sig.

I always run the best gas I can which is Chevron 91 which is the best we have out here.

I am buying some heads but one problem. They have been milled to 57cc which will put me around 10.7:1 compression. Is that going to be a major problem. Can I purchase thicker haed gaskets to help lower the compression?

I really need some advise people so PLEASE chime in and give me your input.

Thanks

oange ss

iTrader: (50)

57 cc will be more like 11.5:1

iamsickofitall

iTrader: (18)

CR sounds about right to me too

what size cam do you have? there may very well be P to V issues with heads that are milled down to 57cc

1 BLOWN V8

iTrader: (17)

I have the 224/224 cam with 580 lift at 114 lsa.

If the compression is correct at 11.5:1 that is way to high for me since I live in Calif and our best gas is only 91 oct.

PREDATOR-Z

62/63 cc is what you are looking for.

Nasty N8

iTrader: (33)

You can get thicker Cometic gaskets to raise the compression back.

Nate

J-Rod

A thicker gasket could end up causing more detonation if you ruin the quench area.

On a stock motor with a piston .007 out of the hole, and a .053 Cometic gasket a 57 CC head is 11.3:1

http://www.c5frc.com/calculators/Com...Calculator.htm

You really don't want more than about a .035 to .045 quench.

So, your choices are to find other heads, or run 11.3 with 91 Octane...

JZ'sTA

iTrader: (23)

I noticed this yesterday in the forsale section.
I have goten in trouble pointing out things in the past by mods in the forsale section and therefore kept my mouth closed.
Those TEA heads are milled a lot.
You will have too much compression for California, and the flow numbers suffer due to the amount milled.
I would call TEA and have them do a nice set for you.
Unmilled will get you to your goal if you using a 5.3 head.
Flow numbers will be higher as well.
Good luck.

TD's z

yep

1 BLOWN V8

iTrader: (17)

Yea I backed out of the heads. They where just to much compression.

I am looking into getting some Precision Porting heads from Bob. He has great review's on the GTO and Corvette forums.

Question I do have is what would you guys advise would be a safe compression I could run and be safe but pick up a litlle more power?

Also my tuner is Jeff Creech.

Thanks again Ken

JZ'sTA

iTrader: (23)

Many of us run 11.5+ Compression in FAL heat with 93 octane and a damn good tune.
I would go between 10.5-11.0 somewhere.
Probally right in the 10.7 range like you were looking for.

PREDATOR-Z

With 91 octane you could go up to 11.0:1 SCR but more important is your DCR.