Thread: New guy needs Gen V 454 help.....

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no there is not have used stock 454 mark4 pistons in more that one mark 5 -6 they are the same stroke .the ring pack in a mark 5-6 has a small oil ring low tension and the mark6 502 has 2.0mm1.5mm4.0mm set . a stock mark 4 are not 1/6.1/6. 3/16 or 5/64.5/64. 3/16.so you could not just use one piston with your stock mark 5-6 ring set .you would need rings to fit that one mark 4 speed pro piston it would not be the same as a stock mark 5 -6 ring pack that is the only thing that i can see i bore have bore them out and put speed pro pistons in the mark5-6