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Thread: Porting potential of GT40 Vs early 351W heads
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11-02-2007, 12:20 PM   #3 (permalink)
blkfrd
 
Join Date: Sep 2001
Posts: 937
Re: Porting potential of GT40 Vs early 351W heads
Quote:
Originally Posted by ou812 View Post
The GT 40's will make more power. How much depends on your build but typiacally it's around 20-30 more HP.
It's not hard to improve upon the stock sb stuff...
Are you talking stock form? I would be surprised there would be much of a difference between the two after porting. I believe the GT-40s referred to here are the GT-40Ps and the 351w heads are either '69 or '70 C90E or D00E heads.

I correct myself, I just read the Ps didn't come along until 1997 and your heads are coming out of a 96 Explorer.

Found an article that has some comparison data for stock GT-40 and GT-40Ps here under "Articles"

StangPro.com

Here is a site that has comparison data for ported GT-40s and '70 351w heads (DOOE)

Cast Iron Heads
______________________________________
Tracy Blackford: Anaheim Hills, Ca
'65 FB Mustang 331, 282S cam, ported 351W heads. T5z, 3.50 posi.
new rebuild...single plane, more head work, 360 RWHP goal.
Last edited by blkfrd : 11-02-2007 at 03:02 PM.
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