Indy LA-X heads on 68-71 340?

dano said

Depending on your deck height and rod length they could be anywhere. Measure them all in the 12, 3, 6, and 9'oclock positions to be sure.

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This is important.... there are several variations that effect piston heights: rod lengths, crank grinding accuracy and so forth. If the 340 pistons are .020" out of the hole in a coupla spots, the .053" gaskets will be a bit marginal IMO.