L92 Flow numbers
L92 Flow numbers Working on a couple projects with our head porter, and decided to toy with a couple sets of L92 heads. This is a very MINOR cleanup of the bowls and nothing major in the runners at all really. Probly about 6 hrs of hand work really.
Lift In. Ex.
.200 148.9 118.1
.300 220.3 163.0
.400 271.4 199.3
.450 288.4 215.2
.500 303.5 225.3
.550 318.4 232.2
.600 327.2 234.8
.650 336.0 243.6
.700 343.0 246.8
I was fairly impressed with such good results with such minor work. Will have some dyno numbers with these heads on two different 408's. One will be somewhat mild (C6 vette street car) on pump gas. And the other (99 T/A) will be more wild. T/A should be done in about 3 weeks.
Lift In. Ex.
.200 148.9 118.1
.300 220.3 163.0
.400 271.4 199.3
.450 288.4 215.2
.500 303.5 225.3
.550 318.4 232.2
.600 327.2 234.8
.650 336.0 243.6
.700 343.0 246.8
I was fairly impressed with such good results with such minor work. Will have some dyno numbers with these heads on two different 408's. One will be somewhat mild (C6 vette street car) on pump gas. And the other (99 T/A) will be more wild. T/A should be done in about 3 weeks.
Pretty good job. Anymore intake flow is going to require reworking the intake valve seat. GM has done a pretty nice job with these head castings. Also, nice job on the exhaust side too. Did you test it with a pipe?
They should make great power for the money spent.
Good luck with your 408 builds.
Richard
They should make great power for the money spent.
Good luck with your 408 builds.
Richard
Last edited by Richard@WCCH; Feb 16, 2007 at 09:32 AM.
Originally Posted by Richard@WCCH
Pretty good job. Anymore intake flow is going to require reworking the intake valve seat. GM has done a pretty nice job with these head castings. Also, nice job on the exhaust side too. Did you test it with a pipe?
They should make great power for the money spent.
Good luck with your 408 builds.
Richard
They should make great power for the money spent.
Good luck with your 408 builds.
Richard
I firmly believe that mid lift numbers are going to be the key to making these heads work for at least the time being. Once an intake is bolted on, the peak flow numbers come back down to earth similar to the LS7 heads/intake.
Richard
Richard
