Re: Looking for information
As Ed said, look at the engine number to check the actual displacement. The 401 ci (if true) should have been swapped in from a larger truck. The 351 was an option in the pickups in 66 and 67 (68 too?) and is much more desirable over the base 305 ci V6.
When pulling spark plugs, be sure to blow out the spark plug cavities in the cylinder head using compressed air.
The 66 should have a unique hood with the V6 emblems and the GMC turn signal lenses.
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