Hi all,
I asked this over on Inliners too, no firm answers yet.

I'm doing a comparison of all the Inline Six engines I can find and weight of course matters.

For the 235-261 I have about 560 lb.
I weighed a 194 once at just over 400 lb, and a 292 at about 460 lb.

Guessing the GMC is heavier than any of those but really no idea.

Also of course looking for dyno test data on the GMC, I only know of ONE test so its pretty sparse.

Info Appreciated!