3/8-16x1 1/4 Grade 8
A 350 Oldsmobile engine has a different bolt pattern than the Chevrolet engine. The 350 Olds and 350 Pontiac engines have the same bolt pattern. The 350 Chevrolet and the 350 Buick engines have the same bolt pattern. Unless you have a dual bolt pattern transmission (there are some out there) in that Chevy, the Olds engine won't bolt into the Chevy transmission.
Only if the transmission has a dual bolt pattern. Chevrolet and Buick 350 engines have the same bolt pattern. Oldsmobile and Pontiac 350 engines have the same bolt pattern. There were some TH 350 transmissions that have dual bolt patterns.
Water coming up by your head bolt (regardless of engine size) probably means you have a loose head bolt or a blown head gasket.
Yes.
It will if it is a turbo 350 with a Chevrolet mounting pattern.
Yes if the 89 had the same size motor as the 95 the 95 motor will bolt right in. The Chevy 350 did not change from 88 to 95. In 96 it went to the vortec 350 its a little different.
yes
Only you can determine what is best.
60 ft-lbs
3/8-16x1 1/4
Not usually. Most of the transmissions that have the Oldsmobile bolt pattern do not have the Chevrolet bolt pattern.