1964 Buick Riviera 425 Nailhead. The 401 in the skylark was also red. Fits the following Buick nailhead vehicles with 401 425 cid engines.
General Specifications for the 1966 Buick 401 and 425 Cubic Inch Engines The following information has been directly complied from original Buick service manuals for the respective year of vehicle manufacture. Electra 1964-66 Estate Wagon 1964 Gran Sport 1965-66 LeSabre 1964 Riviera 1964-66 Wildcat 1964-66. The BNH2 is for Buick Nailhead 401425 V8 engines in 1964-Up Buick Rivera.
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Turns out it was a 425 Nailhead with some deeply scored cylinder bores two pirate pistons 6 were Buick un-bored originals and 2 were unidentifiable oddballs and all the rod numberspistons had been thrown back in by a blind mechanic. I own the shop manual but no diagram there. The exception is in the skylark. Note the difference between it and the 1966 401 block shown above.
