TF & Speedmaster Flow Tests

Earlie A said
Maybe some of the other guys can jump in here. I'm not going to pretend to be qualified to give advice. My concern would be the large 200cc port on a small(ish) 360 that may not turn high rpm. But it would probably be better than stock 1.88 valve heads.
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If you use those formulas, but don't forget those formulas are based on 100% VE, engines above 100% need less rpm and or more cc.

A 360 with a 200 cc head = 7500 rpm
A 360 needs 330 cfm @ 7500 rpm
A 360 with a 161 cc head = 6000 rpm
A 360 needs 266 cfm @ 6000 rpm

The heads cfm and cc rpm requirement for a 360 is miles apart 6000 rpm vs 7500 rpm, even with a 408 would be miles apart just at lower rpms.

I'm sure the head will make power in between 6000 and 7500 probably around 6500 rpm with the right cam cr etc.. I don't think these engines are as sensitive as people try to make them out especially at lower efficiencies.

My guess 360 with an 1.20 lbs-ft per cid x .9 = 388.8 x 6500 / 5252 = 481 hp @ 6,500 rpm, 432 tq @ 5,300 rpm, max 360 with an 1.25 lbs-ft x .9 = 405 x 6500 / 5252 = 502 hp @ 6,500rpm, 450 tq @ 5,300 rpm.