[25stevem]

Here’s what a stock 670 casting flows with just a good valve job freshen up that takes the valve seat OD out to 2.10.

This rework mainly effects the flow numbers above .200”


.050”. 40.2
.100”. 82
.150”. 119.9
.200”. 150, this is a killer number that only the 670 casting can produce.

All the next fat flow numbers are due to the details of the valve job tweak.
.250” 178.3
.300”. 198
.350”. 210.4
.400”. 212.7
.450”. 213.9

I have to try and dig out my truly stock 670 intake flow numbers for you.