How Many Of These Monster GM Engines Do You Remember?

[hclarkx]

Nice array of motors. It's interesting how many of them grew from the 348 cubic inch motor of the 50's. I've heard the 348 called a "truck motor" but mine was factory installed in a 1958 Impala Convertible (280 HP). It had three two-barrel carbs and a close ratio "heavy duty" three-speed manual. Gears for that transmission were a special order item and I had to order gears three times in the five years I had that car (1961-66). At 110K miles I rebuilt it. The crank bearing clearances were within factory new spec but I turned the crank anyway and put 1959 police spec heads and cam in it (335 HP) with Jahns 12.5:1 solid skirt pistons (7.5 thousandths clearance) and some other goodies. Drove it another 50K and stupidly sold it (long story). Anyway, loved that motor more than the 400 in my 1968 GTO or the 300 HP 327 in my 1967 Corvette).