Camshaft valve clearance

Road-race engines and ancillaries - general discussion
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Robhi
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Joined: Sat May 11, 2013 11:09 am
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Camshaft valve clearance

Post by Robhi » Tue Aug 13, 2013 11:32 am

Having taken the head of my 2L TC Montecarlo engine to sort a blown head gasket, I have been idling around and took the opportunity to measure the valve clearances with the cam covers off but I don't have any data to compare these too. Can any one please help?

The Exhaust valve clearances appear reasonably consistent at 0.019/0.020/0.021/0.019"
The inlet valves clearances are less consistent at 0.020/0.014/0.021/0.017"

So I guess there are two questions:
1. what should the target clearances be, and
2. what are the tolerances?

The head is a VX head, originally modified by GC with GC 3D cam set up (other mods include Forged GC HC race 84.4 Bore pistons; inlet/exhaust seats mod to GC Road-Race spec 43.5/38, gas flowed head and GC inlet manfiold (40) ; thank you to GC for digging into his archives (paper work with car was somewhat absent); the car also has webber throttle bodies and a Redline ECU fuel management and full electronic distributorless ignition set-up and a sports exhaust.
GC_18

Guy Croft
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Re: Camshaft valve clearance

Post by Guy Croft » Tue Aug 13, 2013 3:54 pm

if both GC 3D cams;

inlet cold 0.016"
ex cold 0.018"

tol +/- 0.002"

gasket settle - tighten up and leave overnight & next day retighten cambox bolts to 14-16lbf ft before checking final clearances.

G
Guy Croft, owner

Robhi
Posts: 9
Joined: Sat May 11, 2013 11:09 am
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Re: Camshaft valve clearance

Post by Robhi » Sat Aug 17, 2013 10:01 am

Guy, Many thanks for the very speedy response. Robert
GC_18

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