Here is an update for any out their interested;

Dean, I know you were curious


PostPosted: Sun Feb 03, 2008 1:14 pm Post subject: Reply with quote
Okay Guys,

I have an UPDATE for you. These mildly ported Thor Gen II heads have an intake runner volume of 475 cc's. The exhaust runner volume is 234 cc's. The chamber volume is 67 cc.

With a 45* seat angle valve job,,, did I say 45* Seat Angles Question ,,, NOT 50* or 52* or 55*. Yes, 45* seat angles for long running continuous duty cycles, we have the following flow numbers.

Intakes; average of 4 ports.
.200=160.8, .300=240.3, .400=321.3, .500=399, .600=459.5, .700=495, .800=519, .900=530, 1.000=539.5 cfm.

Exhausts; average of 4 ports, WITHOUT a test pipe.
.200=125.3, .300=176.3, .400=233.3, .500=299.8, .600=335, .700=351.5, .800=361, .900=368.3, 1.000=372 cfm.

With a test pipe put on at 1.000" lift, the flow jumped from 372 to 405 cfm. Testing was done on a 4.625" bore @ 28" H2O. I was very pleased with the flow numbers and the next set, that's already here, will have the steep angle valve job. I'm expecting higher flow numbers above the .800" lift, but the trade off (as always) will be lower flow numbers in the mid range lift area. I'l post that data in a couple of months.

I hope you find this data interesting,
_________________
Charlie Evans