OST-039: The end of the beginning....

[oldeskewltoy]

from another forum Wrote:Dude,


It will be interesting to see the before and after flow-rate comparisons.

.

oldeskewltoy Wrote:and the results.... (before)

exhaust:
.050" - 29.8 cfm
.100" - 62.4
.150" - 95.8
.200" - 112.2
.250" - 118.3
.300" - 121.3
.350" - 121.8


Intake:
.050" - 39.4
.100" - 79.8
.150" - 118.8
.200" - 150.2
.250" - 171.9
.300" - 177.8
.350" - 180.2

and now with porting, same valves, old valve job (further improvement likely with fresh 3 angle)

Exhaust:
.050" - 30.4cfm
.100" - 64.4
.150" - 96.5
.200" - 114.3
.250" - 125.5
.300" - 129.3
.350" - 132.0


Intake:
.050" - 39.4cfm
.100" - 80.0
.150" - 122.2
.200" - 156.7
.250" - 182.2
.300" - 197.3
.350" - 204.0

.300" = 7.62mm, or just a tiny bit more lift then early stock cams(7.5mm). .350" = 8.89", or nearly 9mm.

So.... flowing through the stock ports I gain 10cfm@ .350" lift on the exhaust side, and I gained nearly 24 cfm on the intake side.