I knew about the J2 3-2's but I wasn't really aware that a performance camshaft was included. I was aware of a "full race" J2 version that really wasn't available to the public, that included the works. It was designed for NASCAR. Lee Petty took a totally stock J2 out on the Daytona Flying Mile and hit 144 miles per hour (remember factory stock) which was 20 miles per hour faster than any other make. We all know that at this point NASCAR disallowed this configuration, claiming it was not available to the public. It did become available but NASCAR stood their ground. Lee Petty won the 57 NASCAR championship with a 4 barrel version.
I am sure you knew all this, as do most Olds ethuiest.
I probably didn't clarify, but my real question is why the 58 371 305hp ran so much stronger than the 57 277hp. Same thing with the 58 312hp vs the 57 300hp J2's. A 58 305hp 4 barrel Super 88 would outrun a 57 J2. This is based on performance numbers I have researched from old road tests, so if someone out there can prove different, I am open to learn.
The 56 although with an improved, more powerful 324, was slower than the 55. But that was because the Hydramatic went from electronic shift to a smoother, but less efficient bladder fluid shift.
I am still looking for a replica dry filter air cleaner. I really can't find an aftermarket air cleaner because they are all 5 1/16" (or so) necks and I measured the Rochester 4 inches across. I wonder what the CFM rating was for the R4?
Keep on keeping on
