Advise please Purchasing some heads for my 02 Z-28 and have a very important question
#1
Advise please Purchasing some heads for my 02 Z-28 and have a very important question
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
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
#3
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Originally Posted by oange ss
57 cc will be more like 11.5:1
what size cam do you have? there may very well be P to V issues with heads that are milled down to 57cc
#4
Originally Posted by iamsickofitall
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
what size cam do you have? there may very well be P to V issues with heads that are milled down to 57cc
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.
#7
6600 rpm clutch dump of death Administrator
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...
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...
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#8
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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.
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.
#10
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
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