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O290 pistons?

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EAABipe40FF

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I should take a picture but I forgot.... I've been meaning to ask about the pistons I found in the O290G engine I recently converted to accept the O320 cylinders. The pistons are different, not like the pistons in the Spezio's O290. They have 4 rings. The normal 3 rings on top and an extra ring towards the bottom?

Maybe O435 pistons?

Jack
 

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