[billschroeder5842]

Thanks Guys for the responses and ideas.

I've done a radiator swap before on my ZR1, so I had a good idea of what to expect and this radiator is not was was expected. I ordered a OEM "direct fit" meaning DIRECT OEM fit with zero alternations as I'm kind of a OE guy and don't race.
The radiator core (Dewitts knows this as they included shims) is too wide, the upper filler neck is too big for the hose, the lower petcock drain protrudes 1 1/2 inch and the reservoir inlet protrudes 3/4 more than stock all causing "snags" when installation--- I broke my shroud trying to make this work.

I'll call DeWitts on Monday and work a trade in for a correct one. If they don't have one, I''ll get my money back and order a Delco OEM.