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So many ways to achieve a result. No way should be considered the only way. We all are after different level of result.
We typically flow the whole intake system which for us is the Cyl head, manifold and filter assy. This way we get a flow number that to us is representative to what we will see in the car. The only difference should be a positive one if we were to gain any increase in pressure from any ram effect. We do it this way when we design our camshafts, head work and valve train parts.
We use 25" as well as this is where our bench is calibrated. 28" is often used but I have seen where the conversion factor is never applied and the flow numbers come out larger than real life. Its like HP, big numbers sell head work.
Absolutely nothing wrong when flowing a head without the Intake, but the numbers are more representative when comparing one head against another.
If this endeavor is to give the PCA some info to rule by, make sure its correct and relevant. If an aftermarket Intake system and EFI system can be used in this category, can I assume the PCA are open to suggestion? Ask if the engine internals are judged by weight and not stock part numbers.
If the crankshaft, Rod or pistons are to weight, why should it matter what brand is used. It opens up the opportunity for business in the aftermarket. The race customer needs the aftermarket support and visa versa.
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