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The exhaust flow is above 260...numbers are: .200 112 .300 181 .400 229 .500 257 .600 271 .700 278 .800 281 .900 284 These numbers are flowed without a pipe extension. The real intesting part is that my engine builder has built an engine for another customer with supposedly identical...

richdubbya, Thanks for the response. You are correct, it is a port designed to direct flow all around the valve's diameter but it does create some swirl in the combustion chamber. My problem is that the engine simply doesn't make the power it should and the mfg only can say that the heads are...

I'm definitely not an expert at flow but I'm just calling turbulent when the flow sound changes dramatically (gurgling sound sort of) and flow goes backward.

I've been told over the years that a swirl port design is not necessarily a good thing for high compression engines...i.e. 15.5:1 to 16.3:1 compression ratio. However, I have bought a set of SB Chevy cylinder heads from a reputable company for a high end drag race engine and am struggling to...

I don't know your application but I do have a bit of experience with drag race engines. I have found that the best pan is the largest volume pan you can fit under the car without any crank scrapers or windage tray. I have seen a perpendicularly mounted crank scraper kill 20HP on a 850HP small...

Does anyone have experience using Dynomation Software? If so, have you found it useful in optimizing engine performance? Thanks, Brian