17th Jan 2014, 11:26

Guys, there's nothing wrong with the 307, it's reliable, durable, cheap. I had many in Oldsmobiles - Delta 88s and 98s, and one in a Cadillac. The thing about the 307 was that the ones in '85 and after were a bit weak, but '84 and before were pretty good, power wise. Something about the heads.

And as far as making the gears lower - good lord, wouldn't that defeat the whole purpose of driving a Cadillac: quiet, smoothness, and relaxed high speed highway cruising? I never thought of a Cadillac as focused on acceleration.

18th Jan 2014, 22:44

An Olds 307 conversion is straightforward. Adding anything larger would require you to do some modifications to the engine compartment to make room for the larger engine. Not to mention that most of the auxiliary components and transmission are a straight carryover from the 4.1 to the 307.