My literature shows that the 702 and 351 have identical wrist pins at 1.240".
Bore is a nominal 4.562 (4-9/16) with standard oversizes at 0.020 and 0.040.

Rods are the same as a 401 V6, and I believe a 351 also.

Looks like Kanter sells parts, I have requested their catalog.

I think hydraulic Lifters are the same as a 235 / 261

I have seen Egge pistons before, while suitable, I don't think they are as good as the real thing.
I too think Ross could make them, but at what price?

I am still thinking that there will be some genuine GMC pistons out there somewhere, or some NOS replacements? Or even new ones from a regular engine parts store.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-