Thread: can i use 400 pistons

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however if you use the 400 rods----

The 350 and 400 use the same compression ht pistons---you can use your 350 4.060 pistons with the 400 crank with turned down mains to fit the 350 block main size. the piston bottom of 350 pistons and the 400 rods will be closer to counterweight of the 400 crank, altho you will need to check for skirt clearance at and near bottom center---the 400 has less mass in the counter weight and needs to be external balanced where the 350 ( 2 pc seal ) cranks are internal balance-

There are several configurations of 350 pistons and most of the performance type( say z28/vett ) can be used with careful checking--some of the cheaper cast rebuild pistons have longer tangs and may contact the crank

There was a time when guys used to use Buick rods resized.They are 5.85 long.Little better than the stock 350's and not quite 6".Stroker use required serious pan grinding.