heads
Drifting
Joined: Feb 2003
Posts: 1,973
Likes: 1
From: San Antonio Texas
CC is Cubic Centimeters. You can block one opening of a port and fill it with liquid from a measureing device. This shows the size (volume) of the port, not how much it can flow. Some heads; with a 190CC port for instance, can flow much more air than another, with the same volume port. It's design, and engineering. Generally speaking though, a large port can flow more, but at a slower velocity. This makes for a less torquey, less responsive motor; in the lower RPM ranges, if it is used on too small a motor. Too small a port on a big motor is responsive, and torquey, but won't make big HP. It's getting the right combination that makes for a winner.
Racer
Joined: Jun 2007
Posts: 367
Likes: 0
From: Springfield MA
Team Owner
Joined: Sep 2001
Posts: 62,066
Likes: 1,722
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Drifting
Joined: Feb 2003
Posts: 1,973
Likes: 1
From: San Antonio Texas
There were two heads used in '86. Early units were cast iron; later aluminum. I think the late heads were 58 CCs. If you put 64 CC heads on the late block, you would lose compression. Heads can be milled, for smaller CC chambers... sometimes you also need to mill the intake faces of the heads, to allow the intake manifold to fit properly afterwards. Depends on how much material was removed from the deck of the heads. Can't be sure if the heads you're looking at can be milled that much. Check with manufacturer. Pistons can be changed, and thinner or thicker head gaskets can also be used to change compression ratios.
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 32
From: The Top of Utah
Originally Posted by LayZ
What is the diffrence between a 187cc, 54 cc chamber head. Vs a 200cc, 64cc chamber head? both aluminum.
Originally Posted by LayZ
Does any one know the stock cc on the 86 vette? I found a head I like but it only comes in a 64cc.
RACE ON!!!
Melting Slicks
Joined: Aug 2003
Posts: 3,377
Likes: 387
From: Lakeville MI
If small cc chambers and maintaining compression ratio is desired in an off the shelf head, you may want to check out the trickflow 175 cc head.
This head has 56 cc chambers and flows about the same as an LT4, vortec, or LS1 head. They're inexpensive and available in several valvespring, intake bolt pattern and valve cover configurations.
I think its a good cost-effective choice for an L98 upgrade.
http://trickflow.com/product/chevycy...3degree175.asp
This head has 56 cc chambers and flows about the same as an LT4, vortec, or LS1 head. They're inexpensive and available in several valvespring, intake bolt pattern and valve cover configurations.
I think its a good cost-effective choice for an L98 upgrade.
http://trickflow.com/product/chevycy...3degree175.asp
Last edited by tequilaboy; Aug 2, 2007 at 03:53 PM.
, na I have a good 86, it has the aluminum heads 
. What is the address to your website vader? I hear it's an great read for a build up.