This is for 340 builders

I didn't know that about the old 318 crank, good info. I never thought to look into those engines.

Are your rods floaters? or press in pins?

It's been quite a while since I messed around with stock 340 parts but from memory, the 340 has a .984 floating wrist pin from 68-late 71 and some of the cast crank 340's had floaters but a few of the cast 340's I had just had a press in pin which are smaller in diameter than the floaters if memory serves me correctly. It sounds like yours are press in.

I had twelve 340's sitting here at one time that I gathered over the years but didn't see the need to keep them anymore and sold all but four off. I practically gave a few of them away, I guess we all make dumb moves now and then.