I have a 1966 425 engine in a Century wood boat. The engine sits in the boat facing to the rear. I think all old GM engines had a firing order of 18436572. The valve covers on this engine (old ones from the original 401 Buick engine) have a different firing order. At any rate. I need to know what the correct firing order is an advice on setting the distributor into the engine.

Thanks
Century63@aol.com

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Steve B.
GSCA #2173 (1986)
67 GS 525 Stg IV
66 GS Convertible
65 GS HT
63 Riv