Hi all, hope someone can help me with my mystery motor. Recently bought a 51 Chevy and the previous owner told me it had a rebuilt 250 motor and Powerglide trans out of a 76 Nova. The first thing that got me wondering is I found out that 76 Nova's didn't even come with Powerglides that year. Next flag went up when I went to tune up the car and the spark plugs the shop gave me were the smaller 5/8" plugs when the plugs that are in the motor are 13/16". Someone, (of questionable knowledge) who looked at it said it's a 235. the casting number on the block reads 3877178 and the serial number is F0301PX. Is there a sure fire way to figure this out as I am about to buy some Langdon's headers and would love to know what's sitting in that engine compartment!
