Iron vs aluminum heads
- Thread starter aquickv6
- Start date
DMan
buh bye
- Joined
- May 25, 2001
- Joined
- May 26, 2001
We did this a couple years ago on a local T-R. The difference was awesome with the out-of-the-box GN-1's!
Of course this is expected when you have a 1.90" intake valve vs. 1.77" and 1.60" vs. 1.50" for the stockers and ports to match.
Of course this is expected when you have a 1.90" intake valve vs. 1.77" and 1.60" vs. 1.50" for the stockers and ports to match.
jasjamz
THS Racer
- Joined
- Sep 30, 2004
We did this a couple years ago on a local T-R. The difference was awesome with the out-of-the-box GN-1's!
Of course this is expected when you have a 1.90" intake valve vs. 1.77" and 1.60" vs. 1.50" for the stockers and ports to match.
What type of gains did you see ET& MPH wise?
I would also take into consideration the durability of the TA head if you might ever step things up in your combo you won't have to worry about cracking with the TA heads.
Dr.drivability
9 second wannabee
- Joined
- Oct 1, 2005
gn1's
Cracking? hope not I just installed a set of race ported gn-1's on my beast!!!!!!
The latest version GN1s don't crack...it's the earlier versions (forget which years). I ran a set of GN1s for 3-4 years out of the box and no problems. HUGE difference between those and stock heads unported. I went from 11.50's to 11.00's on the same turbo by just switching heads.
If I had it to do over again with mods on my car, GN1s would be at the top of my list. My car ran 12.6's(108mph) at the track with a stock turbo on pump gas(no alky) with them at 16lbs of boost. Just drove to track, put on slicks and ran. Plus, Tom has always been great to deal with as I have drove down to drop off/pick up heads at his shop several times having them freshened up on rebuilds. He did the work himself on one occasion.
