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As noted, factory manifolds did not use gaskets. First, have the manifolds inspected for cracks. Second, have them checked for flatness and ground if necessary. Third, use a straightedge and feeler gauge to check the exhaust flange surface of the head for flatness. Finally, if all is good, install the manifolds without gaskets. Torque the bolts per spec. Use the factory style lock tabs to prevent the bolts from loosening. Drive.
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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
86 Caprice wagon (w/307 Olds)
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