Chevy TBI head exhaust throat experiment, Increase to 83% throat. Winner or loser?

[@andrewburlock2653]

Hi Charlie. Thanks for the update. Keep up the good work. Like I said before, you're the only guy that shows the details like this. Andrew

[@servediocylinderheads]

Thanks

[@approachingtarget.4503]

2 things. The valve guide boss doesn't need to remain square to the valve seat. It can also be slanted. And something that could speed thi gs up if you have the equipment. A bowl hog can open the throat precisely to 90% and than be blended by hand from that point. The noise can tell you exactly where the restriction is. The higher the pitch of the noise, the closer to the valve seat is causing restriction. A low pitch is from further into the bowl.

[@servediocylinderheads]

I only have Sioux stone valve seat kit. Using the Sioux pilot on an angled guide is problematic for me. I like my seats .001" or better. Thanks

[@mikkokuorttinen3113]

Thanks Charles for the update! The port seemed to liked the opening. Perhaps some more...

[@servediocylinderheads]

You bet. Stay tuned!

[@bcbloc02]

Getting close to that 300, just needs a bit more. 🙂

[@itseithergonnaworkoritaint7852]

Winner, winner you deserve a chicken dinner.😎👍

[@servediocylinderheads]

I actually had chicken tonight!

[@itseithergonnaworkoritaint7852]

@@servediocylinderheads
You earned it BROTHER!😁👍

[@servediocylinderheads]

@@itseithergonnaworkoritaint7852 Thanks!

[@Doober12082]

More great info for us novices... are most production SBC exhaust ports the same? I'm trying to follow your 083 methods on Speedtalk based off the contours I see for an L98 C4 project, hoping for the best.
Thanks again 🤘

[@servediocylinderheads]

They are pretty close but not the same. I got good numbers out of the 083's. They have the same exhaust port as 193's. Thanks