Port velocity average target fps?

What average target fps should you be shooting for and how much for different levels of builds like daily driver street to like pro stock?

Is there kind of formula or guild or rule of thumb for target fps?

So far mainly from Speier Racing Heads that he seem to target 310-350, he stated 350 fps is like a a Pro Comp engine and 330 fps for bracket racing didn't say what 310 fps was for.

How to figure needed cfm and csa was given but not target fps (velocity),Formulas given.

Min CSA = b x b x s x rpm x 0.00353 / 613.8
Cfm demand = cid x rpm x 0.0009785 / 8
Average CSA = port length x 16.387 / port volume
Average fps = cfm x 2.4 / CSA




On a side note what I find keel piece of info found a long the way looking into this was, max tq per cid was 1.67 which is about a max 135 VE% and max hp for a cylinder head is about 2.5 hp per cfm and to get max hp is by moving max tq per cid up in the rpm range to get max peak hp on wedge is in the mid 9,000 rpm then you have to go staggered & canted to go high 9,000 rpm to 11,000 rpm, the straighter the high rpm which ends at the Hemi head for 12,000 + rpm for around max hp per cid is around 3:1. Seems to be the limits of NA gasoline engines at the moment.

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