What a head flows and what you get out of them for power are to totally different things!
Roger that. Best flow with the smallest cross section. Unless it's supercharged, then turn em into sewer pipes.
So looking at these heads, it seems that the exhaust springs only have a damper spring in them, none on the intake. Is that normal? Thanks.
Did they have the rotators on them.. that makes them heavy
The spring on the left has a rotater. They were on exh valves on truck engines. If you were building a mild engine and wanted 340 springs you could not do it. The valves are made for a shorter spring. For what you are doing you will end up with .100 long sb chevy valves or maybe magnum valves. Don't try LS valves, I just did a set with LS valves, and what a PITA
