1970 fj40 piston (1 Viewer)

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I think the bore is different (90 vs 94mm).

The dome-top 94mm pistons are definitely a bugger to find (which I think your 79 has) - I managed to snag one of the last sets around of the 0.5mm over for my ongoing rebuild, and everywhere I look has been out of stock since. Apparently you can also upgrade the head to the '81+ (ish) and get back to 94mm flattops, which are slightly easier to find...the dometops are in that 75-79 (ish) range.

(Not 100% sure on year splits and/or any market differences...or if your block is also a 79.)
 

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