Thanks for the advice. I am now on the hunt for a set of HP manifolds to fit my 69 Super Bee with 383.

Can someone explain what the heat riser valve thing is on the HP manifold? I have noticed that used ones sometimes say they are stuck, or do not have one. Is it needed? If I get a used set, is it easy to replace the heat riser valve, or should I look for a new set, like the ones the Year One sells?

Thanks, Mike

Thank, Mike