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after a valve grind there appears to be little to no clearance between exh and int valves when seated. is this cause for concern? new valves are non ferrous.
 

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Maybe post a pic, many moons ago I built a whole host of SBCs with 2.02 heads. You couldn't see any head between the valves.
That's SBC, I've not built Pontiac engines from the ground up, so like you, I'm looking forward to the Pontiac engine builder's input.
I'd wager though, generally speaking, it's the same.
 
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