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41-48 vs. 49-54 pistons for 6 cylinder

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The Pontiac parts catalog indicates 1941-51 are the same and early 1952 is too if they have a set screw pin retainer (later 1952 had a snap ring pin retainer). Then 1953 and 54 are listed with a different part number from those. The connecting rods apparently changed to reflect the new design too. Hope this helps, Todd C

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if you are going to use aluminum pistons, make sure there is enough clearance, because pontiac straight eights and sixes with cast iron pistons could run with tighter clearances due to both block and pistons were both made from cast iron. aluminum pistons will expand at a faster rate. charles coker, 1953 pontiac tech advisor.

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