Quote:
Originally Posted by steve25
If your rebuilding a RA4 do use RA4 type tulip Intake valves as they really don't flow any better under dynamic conditions and only add weight to the valve train. If you don't belive me then ask yourself why Pontiac did not use a tulip type Intake in the 455SD, or why the aftermarket heads don't use them!
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I believe you meant DO NOT USE. I have found the same thing, the tulip valves hurt flow. They flow better with the 12° flat valve, and even better with a 10° flat valve. I feel a lot of it has to do with the flat floor of the chamber.
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