C4B heads
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From: hertford
C4B heads hi i have a holden hsv gts 300 and am trying to find out info on the engine before i start doing some mods my question is does anyone know what the heads flow or would i do better getting somthing like a set of afr's
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From: Miami, FL
TECH Enthusiast
Joined: Dec 2004
Posts: 627
Likes: 4
From: Miami, FL
Stock camshaft is 212/222. Valve lift would be what you are after. The C4B camshaft is .560/.569"
You have Titanium retainers as that is part of the package. Compression is slightly less at 9.95:1 due to machining of the combustion chamber. Heads are CNC ported by Callaway.
Is your throttle body anodized red in color? That was standard equipment. It should also be a larger bore than a standard LS1.
I know some Aussie LS1 folk. I will send a few emails for you.
You have Titanium retainers as that is part of the package. Compression is slightly less at 9.95:1 due to machining of the combustion chamber. Heads are CNC ported by Callaway.
Is your throttle body anodized red in color? That was standard equipment. It should also be a larger bore than a standard LS1.
I know some Aussie LS1 folk. I will send a few emails for you.
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From: Miami, FL
C4B heads were modified for higher valve flow lifts above .300"
Flow the same as LS1s to .300 at .350 they flow 250cfm and then flatten out at 260cfm after .400"
Very similar to LS6 heads as the LS1 flow almost identical to .300" and then I believe LS6 heads are at about 265cfm @28" at .600"
Hope that helps there.
Flow the same as LS1s to .300 at .350 they flow 250cfm and then flatten out at 260cfm after .400"
Very similar to LS6 heads as the LS1 flow almost identical to .300" and then I believe LS6 heads are at about 265cfm @28" at .600"
Hope that helps there.
Last edited by Felix C; Feb 24, 2011 at 09:27 AM.
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Verdad Gallardo TECH Enthusiast
Joined: Dec 2004
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From: Miami, FL
I recall there were some other build issues with the engine but the heads were not one of them.
Last edited by Felix C; Feb 24, 2011 at 10:09 AM.
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From: hertford
thanks for everyones replys there is problems with the valve springs on these heads which i'am going to change when the new cam goes in
its the flow rate i worryed about i'am going to fit a comp cam 323/234 @.50
595/598 lift 112lsa but also going to fit a harrop 8itb intake but if the heads don't let enough air i might have to go a different route
its the flow rate i worryed about i'am going to fit a comp cam 323/234 @.50
595/598 lift 112lsa but also going to fit a harrop 8itb intake but if the heads don't let enough air i might have to go a different route
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From: Melbourne
Wikipedia the c4b engine. It has a half assed CBC job and the springs are shocking. Hsvgtsr contact me mate. I'm in aus and i can guarantee a setup for your car you will love and be able to drive on day in day out.
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From: hertford
