Re: clevo heads onto 351W
G'day LTD351, -12 outlets should be enough, I ran -12 outlets out the front of my heads and it never overheated, it was n/a street motor though. I ended up changing it to a windsor style manifold though cause not having a thermostat was a true pain in the arse. Felpro 1021 head gaskets are the go, they are specifically for boss motors, and are quite different to both the clevo and windsor head gaskets.(check that number before ordering). In the installation instructions it tells you to drill some holes in the block and heads, you basically just driil all holes that dont line up with the holes in the gasket. This eliminates steam pockets, ect, that could lead to cooling probs.