Going to Get heads today Quick Question
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Originally posted by DirtyDaveW
Well, just got back from GTP. I took one of my ported LT1 heads over to him on Friday to have the head flowed on one cylinder. I suppose he(Craig Gallant at GTP) just picks a random one or perhaps the convenient one (it was one of the end cylinders anyway).
My porter said that he'd got 283 or 287 out of the heads during his port work. That might have been on one cylinder. GTP's flow sheet, for whatever reason, are lower. This may just be flowbench methods, setup, or like chassis dyno's, everyone's unique.
Here's the tale of the tape, err... flow bench.
Valve Intake MAX CFM: 265.4 Avg CFM: 239.2
Lift Flow
===================
.2014 152.0
.3069 208.6
.4009 243.9
.4532 256.3
.5044 261.3
.5510 262.5
.6038 263.5
.6502 265.4
Valve Exhaust MAX CFM: 200.4 Avg CFM: 174.8
Lift Flow
===================
.2013 115.1
.3002 142.6
.4006 166.4
.4511 175.4
.5030 186.4
.5518 190.9
.6047 196.3
.6512 199.5
.7092 200.4
Well, just got back from GTP. I took one of my ported LT1 heads over to him on Friday to have the head flowed on one cylinder. I suppose he(Craig Gallant at GTP) just picks a random one or perhaps the convenient one (it was one of the end cylinders anyway).
My porter said that he'd got 283 or 287 out of the heads during his port work. That might have been on one cylinder. GTP's flow sheet, for whatever reason, are lower. This may just be flowbench methods, setup, or like chassis dyno's, everyone's unique.
Here's the tale of the tape, err... flow bench.
Valve Intake MAX CFM: 265.4 Avg CFM: 239.2
Lift Flow
===================
.2014 152.0
.3069 208.6
.4009 243.9
.4532 256.3
.5044 261.3
.5510 262.5
.6038 263.5
.6502 265.4
Valve Exhaust MAX CFM: 200.4 Avg CFM: 174.8
Lift Flow
===================
.2013 115.1
.3002 142.6
.4006 166.4
.4511 175.4
.5030 186.4
.5518 190.9
.6047 196.3
.6512 199.5
.7092 200.4
Registered User
Joined: Dec 1999
Posts: 1,791
From: Upstate New York,USA
Unfortunately, I don't have a flow sheet from the original guy. The disparity mirrors (pretty much) another set of heads from the same porter. My friend took these ported units to GTP and his numbers, though reputed to be 280, were somewhat less.
Here's a scan of his GTP flowsheet
http://www.9t4z28.com/images/headschart.JPG
Stacey just dyno'd his heads with a LT4 Hot cam. He got 347 rwhp
Through the cats, full exhaust. His car is an A4 so it has slightly more driveline loss of course.
Here's a scan of his GTP flowsheet
http://www.9t4z28.com/images/headschart.JPG
Stacey just dyno'd his heads with a LT4 Hot cam. He got 347 rwhp
Through the cats, full exhaust. His car is an A4 so it has slightly more driveline loss of course.
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