273ci thoughts?

Slantsix64 said

Use The LA 318 Roller motor pistons they are taller then the other year pistons and they are flat tops

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Sealed Power 526P or 526AP are 9.0:1 (1987 Dodge 318) Yes they are flat tops and would work great with those closed chamber 302 heads that came on them. 920 heads or a 1966-67 273 head would work well.