My last data points, then I'll back away from the keyboard and let the discussion continue without me.
Avg of 4 intake port tests on PRH flow bench with 2.20" valve:
.100 - 75
.200 - 151
.300 - 220
.400 - 280
.500 - 326
.600 - 346
.700 - 355
294 cc; Min CSA 2.65; Avg CSA 2.76
This is a true standard port opening that requires no gasket trimming for proper port alignment.
EDIT (and THEN I'll go away): To anyone outside of the Mopar world, those specs would pass for a mediocre -- at best -- 15* SB Chevy head. I've joked around before that building a stock-stroke 440 is basically building a stroker small-block with a really sh!tty bob weight.
My heads are some of the early ones that I opened up to max wedge specs myself, I got these numbers super flow 450 bench at 28 inches clay radius on intake and no pipe on the exhaust. Stock gasket opening like yours.
intake
.100 75cfm
.200 149
.300 219
.400 299
.500 323
.600 330
exhaust
.100 57
.200 109
.300 157
.400 190
.500 209
.600 222
I never flowed them at a higher lift as at the time my cam was just slightly over .600 lift 3,200lb 512 CID, car ran best of 9.65 @ 139mph NSS car with two 750 AFB's So from your experience I don't have much left in porting these heads any more? Any comments or tips is appreciated. On the engine stand now, will be 540 CID with a .740 lift cam for next year.
