It's a dual pass "be cool" aluminum radiator. I got it from summit racing as a kit for an s10/blazer v8 swap. Probably wouldn't reccomend it as it doesn't leave alot of room for the motor and it's not quite enough to keep the engine cool on the street (only drag racing). I have plans to get a triple pass and do some fab work to the front end so I can mount an electric fan behind the radiator instead of in front of it. Thanks for watching!