97 gt- PI swap- Head Gasket Size Choice?

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05-02-2009, 02:28 PM

#11

Chris98Gt

3rd Gear Member

Join Date: Apr 2007

Location: Georgia

Posts: 931

Yea I think stage 2 pi's will hit, I think the stage 1 pi cams will be ok tho. Pm 10inchterror (I think thats his name) he would be able to tell you for sure.

05-02-2009, 03:14 PM

#12

jeff37110

2nd Gear Member

Join Date: Mar 2009

Location: Tennessee

Posts: 276

Thanks

12-07-2009, 10:26 AM

#13

TekcisGT

Join Date: Dec 2009

Location: Texas

Posts: 1

Quote:

Originally Posted by Chris98Gt

No they were stage 2 npi cams, only 500 lift, 232/230 duration.

Chris, what compression are you running? After reviewing hci combo's, im going to try KB 6psi on stock NPI sb w/ Pi swap. The numbers should still be decent with a tune..and safe. I called KB on this one and they said it would be fine, just dont get crazy or greedy, no problem.

12-07-2009, 10:29 AM

#14

98redstang

5th Gear Member

Join Date: Mar 2008

Location: NJ

Posts: 2,312

Quote:

Originally Posted by Jcurley5

I was wondering what size head gasket I needed to bring the compression ratio on a 97 gt (with PI heads) back to its original 9:1?

I am going to do a PI swap on my 97 gt with 148,000 miles. I have had this car since I was 15 and I plan on keeping it for as long as I can ( I take very good care of her). My dream is to have a sick turbo setup when I am all done with everything, but I don't plan on spending much cash until I finish my Engineering Degree and get a real job. I want to plan for the future and keep a lower compression ratio for a turbo setup, but I am wondering if I am looking to far into the future. If I were to use thicker gaskets to low the CR, I would probably do the work right the first time and get a set of Cometic gaskets that I hear are great on turbo setups. This could be a few hundred dollars more and it might be a waste if I am going to wait a couple years for any forced induction. I am also concerned about the amount of miles on the rotating assembly and block. Should I use the stock size head gaskets that would make it cheaper but would give me a 10:1 compression ratio? My thought behind this was I could wait till the bottom end busts and then build a bullet proof setup for a turbo.

I use this car for allot of highway miles, dose a higher compression dramatically affect my gas millage? What do you Think?

haha your literally exactly like me. Im going for mechanical engineering and i got my car when i was 16 and im not getting rid of it anytime soon. Im trying to save up to go blown by the end of the summer. This is just plain weird hahaha

12-07-2009, 05:40 PM

#15

Chris98Gt

3rd Gear Member

Join Date: Apr 2007

Location: Georgia

Posts: 931

Quote:

Originally Posted by TekcisGT

I'm running whatever the c/r is on a stock npi shortblock,factory pi heads and factory ford head gaskets. somewhere around 10.5:1 or 11:1. You should be fine with 6-8 psi with an Intercooled Kb setup as long as you stay safe with the a/f ratio and timing.