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Author Topic:   Valve guides
posted July 13, 2004 08:54 PM
Had a set of heads rebuilt about 10 races ago. Machine shop put iron guides in. I lost a cam last race and was tearing down the motor and noticed 3 valve have noticable movment (side to side) How much is to much and can I check this with a dial indicator with the spring still on.

posted July 14, 2004 06:53 PM

posted July 14, 2004 09:51 PM
If you can see noticeable movement with the spring still attached, then it's too much. The correct way to check your guides will be with a dial bore gauge that is designed for valve guides. If your guides are shot after only 10 races, then you have a major geometry problem with the rocker gear, or your machine shop did sloppy work to begin with.

I assume your running 11/32 valves. If so, the proper clearance for the intake's would be .0016"-.0018" and .002"-.0022" for the exhaust on a dirt car. I would also suggest bronze guides.


Hendren Racing Engines
Rutherfordton , NC
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posted July 14, 2004 10:35 PM
Thanks for the info and heads are going to a different shop.

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