GM Performance 25534446 Vortec Large Port
 

Which head porter has a lot of R&D with these castings?max effort porting but no welding is allowed,need to make 2.3hp per cube .single cast manifold, compression unlimited,flat tappet cam. 320cid

Re: GM Performance 25534446 Vortec Large Port
 

You probably need to get Ken to move this to the Comp and Modified section.

I'd call Slawko.

Re: GM Performance 25534446 Vortec Large Port
 

As I understand, Glenn Knowlton in Minnesota did the cylinder heads for the SS/CS Firebird owned by Randy and Michael Mans.
I been told Glenn passed away earlier this year; however, there amy be someone still running his shop.

Re: GM Performance 25534446 Vortec Large Port
 

Hettler has a program

Re: GM Performance 25534446 Vortec Large Port
 

Travis Knowlton (Glenn's son) is running the shop

763-784-0687

Re: GM Performance 25534446 Vortec Large Port
 

Is Hettler still working at Rick Watters?

Re: GM Performance 25534446 Vortec Large Port
 

Nope, he is back home in PA.

Re: GM Performance 25534446 Vortec Large Port
 

Since when did he go back ?
Is he running his own shop ? :cool:

Re: GM Performance 25534446 Vortec Large Port
 

About a year and a half ago..
Pretty much just does cylinder heads..

Re: GM Performance 25534446 Vortec Large Port
 

If somebody has his contact details can you PM me thanks :)

Re: GM Performance 25534446 Vortec Large Port
 

hi clevo what class are you running in.

Re: GM Performance 25534446 Vortec Large Port
 

We do the heads for James Antonette's SS/CS engines with those heads.Not going to be easy to make that power with flat tappet cam. He has been 9.20's with the car in that class.

Re: GM Performance 25534446 Vortec Large Port
 

Call Dave Layer at Heads Up.

Re: GM Performance 25534446 Vortec Large Port
 

Is there a better cast iron 23deg head out there ? :(

Re: GM Performance 25534446 Vortec Large Port
 

Dart has recently came out with some decent stuff but, your asking alot with that combo. I don't know how good they are.

Re: GM Performance 25534446 Vortec Large Port
 

I do not think there is a program for the new Dart head yet or a piston to fit the chamber.

Re: GM Performance 25534446 Vortec Large Port
 

As I understand, the new Dart offering is based on the prior offerings from Racing Head Service (RHS) when they got rid of all their cast iron heads.

Re: GM Performance 25534446 Vortec Large Port
 

The spark plug location on the RHS is to low if you cut the head.

Re: GM Performance 25534446 Vortec Large Port
 

Yupper

Re: GM Performance 25534446 Vortec Large Port
 

[QUOTE=Dyno;332213]I do not think there is a program for the new Dart head yet or a piston to fit the chamber.[/QUO What kinda program? Piston to fit chamber?