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Pull the valves out and you might see something. I've had a couple that had valves pounded right in that didn't warrant a look.

Great quick way to measure, I would still get an inside mike to measure out of round to help my decision.

Now this was a 5.2 I put LA heads on with external oiling and a 284/484 purple shaft flat tappet for my son, going by memory. It was 2-3 degrees advanced and had room all over except when the intake valve was chasing the piston, it started to get tight, maybe .090 thou. With no valve...

Last time I needed one I found a selection at T.S.C..

Have you tried more accelerator pump shot or a larger discharge nozzle? Adjustment and nozzle change are easy to to do.