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The 68-70 W-31 motors used the flattop pistons with the 64 cc chamber heads with no problems. You won't have any problems either.
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Joe Padavano
64 Jetstar 88 Conv
66 442 L-69 Conv
68 W-30
69 H/O
69 442
70 W-30
72 442
84 Custom Cruiser
86 Caprice wagon (w/307 Olds)
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