I have updated my cylinder head flow spreadsheet with some new information. I have broken it down by LS1, LS6, 5.3, and 6.0L
If you have flow information for a set of cylinder heads that you'd like to see added, please forward it on. The more information on the heads, flowbench, etc... The better. If there are any features you'd like to see added, please chime in.
__________________ 2k Silverado
4.8, Free Mods, LS1 Fans, Custom CAI, RV Tranny Cooler, 207/198 .500 .500 115.5, Nelson Tune and PaceSetter LT's and Y-pipe. Nevermind, Evil Kanevil pulled out in front of me.
Hard to tell, was that with or without the CNC work? The way he said it it looked to be without....I can't wait to get my hands on a set of these, my 6.0L's flow nearly the same at .625"!
The midlift numbers are good but the .600-.700 could be better. Should work well for what I'm doing, although i don't know what kind of port size they are nor what kind of velocity they cary. Just gonna slap em on and find out though. My 434 shouldn't be as sensitive to a lazy port as a smaller motor.
Hard to tell, was that with or without the CNC work? The way he said it it looked to be without....I can't wait to get my hands on a set of these, my 6.0L's flow nearly the same at .625"!
-Bryan
"These numbers represent the last version we had the opportunity to flow before the final changes were made to the casting to accommodate the CNC machine work for production runs"
It sounds like they were flowed with no final CNC work, but at least had some port work done to them to reach the projected goal.
__________________
06 Trailblazer AWD SS ---------98 Trans Am LS2 402
JRod, i have flow numbers from my latest work, the port is developed with manifold intact. Instead of seeking max flow with clay radius, i have increased flow with manifold to 280+cfm@.600". This latest work has proven to be superior to chasing big numbers method. If you think this is worth adding to your chart i will send it to you.
Jeff (formerly LS1derfull)
__________________ 2001 Z28 Camaro 346" LQ9 ported heads M6, Best Et:11.4@121.50mph 1.60 60 ft. 7.0@97mph 1/8 3700lbs race weight 9" rear
1968 Chevy II 402" L92 all alloy LS2 650 FWHP/545FWTRQ all motor pump gas everywhere but So.Cal.
3250 lbs 10.30@129.25 mph note: slicks are only good for one year and 5 foot wheelies can equal broken oil pans! lol 1.40 60 ft
1999 Silverado RCLB 5.3 Tow vehicle and Daily driver,lowered 10 yrs old still nicer than any Tundra...
Updated Cylinder head flow numbers spreadsheet 
