it's not that much of an extreme exhaust port, still left the sleeve in.



How's about this one!!



Running in about 8 or so engines so far, mostly street driven 12a, 13b, bridgeport, PP and turbos.



Have had NO apex failures.

 

Gotta agree with Peril 787b, not very extreme at all, I've done wider. You would be suprised how wide you can actually go. I've done 10mm from the edge of the housing with no noticeable wear, on a motor that was daily driven for over a year on stock 3 pc 2 mil apex seals. If you went up about 8mm and down about 3mm on that port you would have the port in my old car that spent the last 3+ yrs on the street at over 450whp regularly revved to 10k.

 

How far out would you port a street car? Anything special on the closing edge?.



When you say 3 years, how many miles would you estimate?

 

The customary bevel on the closing edge. I would port a street car the same as I described in my last post. When you build your own and replace whats warn, life is much easier(cheaper), I actually started hoping the damn thing would blow so I would have to take it apart and then try something else. The car is still on the road, it has about 50,000km since it was last rebuilt, and that was only because a freeze plug rusted out.

 

I'm finally going to assemble that engine