I've always heard that Quad 4's were one of the worst engines GM ever made? Their head gaskets weren't up to the power the engine was putting out and the heads cracked really easy. I drive a 2.5 in our delivery vehicle and I can't stand it...no power, noisy, etc. Why not stuff a 4.3 in? They're decent engines, albeit the noise.

Chad

1955 Chevrolet 210 2 door Sedan
a 30,000 mile UNMOLESTED original, now my daily driver! Original 6 cylinder with a rebuilt '66-'69 Saginaw 3-speed Overdrive. Synchro low! Otherwise, everything original down to the spare tire. Interior is like new. Needs paint, but absolutely zero rust.