Anyone have any coments on the 428 big block found in the 1968 Grand Prix....I found on for sale..all stock / no door panels?(strange) , buckets and console, hidaway lights...don't know anything about that motor..are the good? bad? expencive to fix? any advise would be helpfull..thanks.
The 428 is derived from the 421-ci V-8 that debuted in 1961 as Pontiac's Super Duty version, and was used in NASCAR stock car racing...
Long Journal
The 421 and the 428 were the first of Pontiac's big "long journal" V-8s, with the 421 featuring large 3.25-inch main journals, a 4 3/32-inch bore and 4-inch stroke....
Bigger is Better
The 421 was produced until 1967, when the 428 debuted with a larger 4 ¼-inch bore and the same size stroke and main journals.
Slight Changes
Pontiac stopped using steel crankshaft in 1961 and shifted to cast iron, but used a stronger alloy in the cast iron for the 1969 428.....
Short-Lived
The 428 was only available in large Pontiacs, and a few were factory installed in GTOs and Firebirds before being replaced for 1970 by the 455.....
