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Discussion Starter · #1 ·
I got my open chamber heads back fro the shop 18 months ago and and after after the engine started and settled down i noticed a clattering after a medium reving of the engine. I have a very tame cam and new hydraulic lifters with 65 PSI oil pressure. The engine runs smooth besides detonation, but thats another topic. I suspect valve lash. Where can I find the spec for valve stem protrusion. I had him level the valve stems but I don't know if he kept them in spec. Does anyone know where I can find this information. I know there is a tool to place around the stem before install, but I don't have it. Would it be safe to use lash caps on the stems? As long as there is no coil bind of course. :confused:

-George
 

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Discussion Starter · #3 ·
The heads are 3462346 a 71-73 head and the chamber was measured at 89cc. I had the exhaust valves replaced, so I think that changed things from stock. And new hardened valve guides. The ping is from the too high a compression, pistons, 11:1, calculation error. I have stock 9:1 pistons ready to be installed, as the whole reason for the the engine tear down. The timing can only be safely be set to about 3 degrees and I still can't floor-it without knock on 91 octane. Even with 100 octane, I can still hear the knock at 7 degrees. All new roller timing gears from edelbrock for their cam.

The clatter is definitely in the valve train. Stock stamped rockers.

I really just need the protrusion height information to do some checking.

Thanks for any help.
 
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