Has anyone done this? Rules for a class I'm interested in allow angle milling, but require valve angles of +/- 3* of factory. This would mean ETPs have to be changed to 12* to be legal...

 

i don't see why that would pose a problem,your headers should still clear easily and the slight diference in the angle shouldn't hurt the way the intake bolts up either.i wouldn't thing a 1/2 * in geometry should hurt that much.does people in that class actually get tore down and checked ? i can see why someone with a 23 *sbc verses an 18 or 15* sbc would be handicapped but i was just wondering if other racers protested or what.

 

Since between the purse and contingency the potential proceeds to the winner can exceed 2000.00, I'd imagine protests are possible.

 

It probably could be done by a good machinist (correcting the intake flange might be tricky, but do-able). It will take about a zero-.150 angle mill with the material obviously coming off the quench side of the chamber, not the sparkplug side which is obviously more common. You may even need less if the heads are really closer to 11.3 degrees etc., etc. I would check with the guys at ET and see the exact angle the heads are currently configured for (or simply measure with quality instruments).

Good luck....sounds like an interesting project.

Tony

 

Or you could angle mill a TFS 13.5 degree head to 12

 

11.3?? is that from your CMM??

 

I think that was a general statement

 

I think you'd be way better off angle cuttin the et's to 12 then messing with with trick flow stuff. IMO.