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well im into buliding my 360 now and i need some info on the heads. will post cast # tomorrow. think there 596 . anyways, i need too know when is it time too reguid them. theses have no inserts, but valves seem a little sloppy in the bores , will i need a dile indicator too measure them> waht is the allowable clearances? the faces and seats look good. and whats with this big hump in the exhaust runner? can i mill it out?going too be swithing too flat face valves and milling 20 too 30 of the heads soon .
 

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If you can feel or see movement they need to go
 

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I believe they can have new valve stem inserts machined into them. The hump is for a smog port. You can grind it away if you want but not much help in the way of flow. On small blockheads the flow hugs the top side of the port. Have the heads checked for cracks also.
 
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