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08-29-2010, 12:26 AM

#11

Dj_Seph

4th Gear Member

Join Date: Jul 2009

Location: Arizona

Posts: 1,127

I have ported GT40p's and they're great! Did suck having to get the MAC shorties but at $100 for the heads, I was willing to live with it. I have stock cam and 24lb injectors and it works just fine.

08-29-2010, 09:10 AM

#12

nitrous_bob

6th Gear Member

Join Date: Oct 2005

Location: st clair shores MI

Posts: 6,028

Quote:

Originally Posted by 89GTnoob

Any HP estimates on GT40s? I think even 30hp for ~300 bucks is considered worth it, is it not? ..........It falls on it's face after ~5500. Will heads help this problem, or is my cam to blame?

im telling you , you can make 300 on gt40's. port the exhaust and do a comp valve job. do 1.7 rockers and anything other than stock intake unless you found a extrude honed stocker. cobra is a decent choice and cheap. dont use an explorer. you want the lower intake part number to end in -AA

NOT -BA, or -BB or -AB

and yes thats more of a cam issue rather than airflow. try a shift lite with a 5200 chip in it... you'll be shifting right on 5500

08-29-2010, 11:29 AM

#13

89GTnoob

2nd Gear Member

Thread Starter

Join Date: Apr 2010

Location: Maryland

Posts: 164

Any idea how much porting and valve job will cost? (What is the valve job anyway?) I thought I read not to go over .500 with the gt40s? I have .498 lift right now with this cam. 1.7s will put me at .529

Last edited by 89GTnoob; 08-29-2010 at 11:31 AM.

08-29-2010, 02:17 PM

#14

projectresto83

M.A.D. Motorsports

Join Date: Jul 2006

Location: Indiana

Posts: 8,014

No one mentioned it but the 24's are not needed either. You can run just fine with 19lb injectors.

08-29-2010, 04:40 PM