I just recently purchased a gm 350 HO with the vortec heads, and don't know what the correct temperature thermostat would be. Even if no one knows what gm recommends, is there any harm in putting a 180F or 195F (like my stock one) in the new engine? Hopefully some of you that also have this engine have gone through the same thing. Thanks in advance.

A 180 would work fine

My 350 HO Deluxe uses a 180.

JamesC

I've ran 195, 180, and 160 in mine. Go 180.

Thanks guys for replying, now I know 180 it is.