[ponyakr]

"...what flow numbers are possible from a 670 head with professional CNC porting? "

When I went back I read this, I decided to check on the SD CNC porting deal.

To my surprise, SD no longer fools with iron heads. I suppose I'm the last to know.

http://www.sdperformance.com/listPro...?categoryID=53

I suppose he has much more than he can do, with just alum heads.

So, who now has the best CNC program for iron Pontiac heads ?

Butler says they do more Pontiac heads than anybody else in the world.

https://butlerperformance.com/i-2445...tegory:1234782

I suppose there are several members here who do hand porting. I assume most members know who these guys are. Any who wish to advertise their porting services can. Don't know who now does a lot of CNC Pontiac iron head porting.

KRE shows lots of alum head CNC porting. But there is no mention, specifically, of porting iron heads.

http://www.krepower.com/Pontiac%20Cylinder%20Heads.htm

Nitemare shows Pontiac iron head porting services. Not a recommendation. Just a possible source.

http://www.nitemareperformance.com/cylinderheads.html

Got this from a Google search.

https://headsandmanifolds.wordpress....-head-porting/