Although I guess it really wouldn't be that much better than checking static flow at a fixed opening. You don't have the varying pressure and shock waves from the piston slamming up next to the head.

Exactly: you would need to simulate valve train action, piston movement, intake and exhaust lenght etc to grasp the 'full monty', I agree. However, this basically means building all the mechanical parts of the engine. A 'stock' flow bench however, can still just indicate how well a constant air flow can flow through a port and past a valve. The 'full monty' flow bench your describing, would basically be a dyno run...

Does anybody have a nice link as how to build a Do It Yourself flow bench? I guess you could setup something using a vacuum cleaner or maybe a leaf blower? That would give me some oppertunities to experiment on an old head or so. B30 heads can be bought cheap over here, and they have 12 ports. Which would give me 6 changes for each port to find out how NOT to do it...

cheers!

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P131, '65, B20B+M47. P131, '69, B20E+AW71L+LSD. (www.tinustechniek.tk)