06-11-2014, 12:57 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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I meant between 360-370 on the intake side.
Tony sent me a flow sheet from a typical Stage 3 head:
.3 212 172
.4 268 210
.5 313 240
.6 331 266
.7 353 276
.8 371 281
.9 376 285
Those are with the 11/32" valves that they normally use. The 5/16" stem valves will be lighter, which will be good since it will allow me to drop the spring pressures down a tad, plus the smaller stems *may* add a few cfm to the mix.
If you extrapolate the flow numbers up above for a .750" net valve lift, you'd be somewhere around the low 360's on the intake side and high 270's on the exhaust side.
Keith will flow these actual heads for me so we can see where we are with the smaller valves, and I usually flow them here as well when I get them. Not that I don't trust Keith, but it's good to compare flow benches/dynos/etc when possible. So far, the SF600 that I have access to has been pretty much dead on with Keith's SF1020.
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