I had forgotten the old 440 had mismatched heads on it, and that was all I had to use in 1988 when dinosaurs roamed the earth.

It had 346 on one side and 213 on the other....same basic ports, just different numbers. This is the 213 head.

Look how the copper coat is intact between the two outside cylinders and the two inside cylinders......but right in the middle, it's black and burned.

Heat: It's got nowhere to go.