Looking to get some head work done on my 088 rec ports.

What are the best perf marine guides for BBC iron or alum heads?

Full bronze guides or Bronze Liners?

Iron guides in Iron heads?

What do you like for stem clearance?

Blown vs NA Hi-Perf

Guide seals? Umbrella style for exh? Positive on intake?

I did bbc heads manny years Liners for old iron most aluminum have bronze already