Senior Tech Team
Join Date: Sep 1998
Location: Mustang, OK USA
To put an Olds motor into a Chevy, or a Chevy motor into an Olds, or, whatever, here is what has to be done. IT IS TO EASY! For the sake of an example, let's say that you want to install a Chev 454 into a 71 Cutlass. The Chevelle and the Cutlass are both GM A bodies, and the chassis are basically the same 68-72 for both (Chevelle, GTO, Cutlass, etc). Use the Chevrolet frame brackets in the Olds chassis and then the 454 drops right in just as though it were going into a Chevelle. And if you wanted to put a 455 Olds motor into a 68 Chevelle, just bolt in the frame brackets from a Cutlass then drop in the Olds motor. All of the GM cars, within the same group and same generation, such as the A bodies, will have the holes in the cross member for the various make of engines.
As mentioned, the Chev and BOP have different bell hlusing bolt patterns, therefore, only a bell housing or auto tranny for a Chev will bolt up to a Chev block and the same for BOP. Although, in later years, GM started making dual bolt patterns on the trannys.
In regards to manual trannys, whether its a Chev or Olds, Pont, etc. engine, from the flywheel surface rearward, all is interchangeable. The 11in clutch, throwout bearing, bearing fork and linkage, Muncie, etc, will all swap from the Chev to the Olds to the Pont to the Chev. Tranny mount on the cross member wil be the same also.