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Originally posted by 1Sicgt:
blah, blah, blah. Low 14's. Well I got 14.3 @ 98.4mph on CAI, and cat-back on my 97 GT. So all that crap everyone else is feeding is blah. PI swap, blah. Don't waste your time. Some people sware by it, but lots of people haven't got the numbers to back the cost of doing the swap. Plus as explained, find a good machine shop, not ones blue97gt (glen) looked into. Ported non-pi heads would and do out flow ported pi heads. Just a fact. Better to put the little extra into the heads you have, to get more gain in the long run, then wasting the money on the swap and getting less out of it. Basics first, get mid pipe back. Stock is a joke. Next gears 3:73's or 3:90's. 4:10's are good but the GT motor doesn't rev up enough to get the true gain out of 4:10's. Then CAI, fuel filter (I say this, becuase it probably hasn't been changed. If this being the case the car will wake up.), pullies, tb, and upper plenum. But don't do the upper plenum and tb, if you plan to swap uppers completely. ie; Bullitt or something better. Bullitt full intake kits are about 800-900. Also, be very careful in what muffler you choose, you wiill notice a big differnece if you use to restrictive of a muffler. I myself have had about 6 muffler, and mid-pipe combos on my car, so I can fairly say I know what works and what doesn't on the NA 96-98 set-up. Also, believe it or not, swap driveshaft. It will get a little bit better acceleration. Remember you don't have mad hp. so anything to lighten the load on whats moving is good. Just before you go head over into it, change all the fluids, give it fresh stuff to work on. It will love you for doing so.

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i said the same thing u said in less words!

i have p/p 97 heads and yes they do out flow p/p pi heads.
and for blue 97gt when my car was stock other then a mid pipe and flowmaster on street tires my car ran 14.08 at 98.
there is nothing freakish about it,its just learning how to drive your car

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"formally 4.6 eatin gm's"
white 97gt n/a 320rwhp/325rwtq
01 sierra rcsb lsx 408 (murdered out)
03 ecsb sierra 6.0 on 22's
2011 Tahoe

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Originally posted by Blue97GT:
okay so you rana 14.3 with just CAI and catback. thats hella good for a 97. i dont know how you did it. factory freak maybe? but in anyones case...if you know that mostly everyone with a 96-98GT they will mostly ALL tell you to do the PI swap. Yes porting and polishing some non pi heads will outflow a ported pi head on our blocks...BUT it IS expensive and the cheapest way to gain a good amount of HP/TQ is the full pi swap. and it will only cost you bewteen 4-600 bucks.

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Originally posted by 4.6 EATIN GM'S:

quote:

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Originally posted by 1Sicgt:
blah, blah, blah. Low 14's. Well I got 14.3 @ 98.4mph on CAI, and cat-back on my 97 GT. So all that crap everyone else is feeding is blah. PI swap, blah. Don't waste your time. Some people sware by it, but lots of people haven't got the numbers to back the cost of doing the swap. Plus as explained, find a good machine shop, not ones blue97gt (glen) looked into. Ported non-pi heads would and do out flow ported pi heads. Just a fact. Better to put the little extra into the heads you have, to get more gain in the long run, then wasting the money on the swap and getting less out of it. Basics first, get mid pipe back. Stock is a joke. Next gears 3:73's or 3:90's. 4:10's are good but the GT motor doesn't rev up enough to get the true gain out of 4:10's. Then CAI, fuel filter (I say this, becuase it probably hasn't been changed. If this being the case the car will wake up.), pullies, tb, and upper plenum. But don't do the upper plenum and tb, if you plan to swap uppers completely. ie; Bullitt or something better. Bullitt full intake kits are about 800-900. Also, be very careful in what muffler you choose, you wiill notice a big differnece if you use to restrictive of a muffler. I myself have had about 6 muffler, and mid-pipe combos on my car, so I can fairly say I know what works and what doesn't on the NA 96-98 set-up. Also, believe it or not, swap driveshaft. It will get a little bit better acceleration. Remember you don't have mad hp. so anything to lighten the load on whats moving is good. Just before you go head over into it, change all the fluids, give it fresh stuff to work on. It will love you for doing so.

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i said the same thing u said in less words!

i have p/p 97 heads and yes they do out flow p/p pi heads.
and for blue 97gt when my car was stock other then a mid pipe and flowmaster on street tires my car ran 14.08 at 98.
there is nothing freakish about it,its just learning how to drive your car

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Ya, I knew you would agree. Been there done that.

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14 Focus TS ST3 full Stg3, ready for bigger Turbo
2003 Cobra Track Car

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Originally posted by 97HEADSWAP:
There is nothing better than a pi headswap, besides a power adder. 1sicGT is right, seriously hogged out non-pi heads may outflow the pi heads on the intake side, and only at high lift. I believe it is greater than ~.500 lift(don't quote me). The valves lift .500 or greater only a very small portion of the time. So for nearly all of the time, the pi heads outflow the the non-pi's. The power improved heads have a whole different/better design and will outflow the non-pi's on the exhaust side, and anything below .500 lift on the intake side. Who cares how high your peak cfm is, if it is at over .500 lift. These are not efficient heads. What did your car dyno at with the ported non-pi's 1sicGT? What was the quarter mile at? Do a search online and see what others can do with the non-pi's. I originally had ported non-pi's with bigger exhaust valves, etc. I got rid of them for ported pi's, and good thing I did. With stock 03 intake, heads/cams and shorty headers I made 270/311(untuned). With a better cam and tune, I would have been ~ 300rwhp. I have never seen this happen with ported non-pi's and a pi cam equivalent. Or for that sake, even a more agressive cam. Plus with the pi swap you gain nearly a point in compression, that gives you a greater and broader torque curve. Look what 10.25-1 compression did for the Mach-1's. This is not meant to flame 1sicGT, I just can't believe people are still trying to compare non-pi's with pi's. No matter how much you port the non-pi's, they are still going to be an inferior design. My engine builder ports both pi's and non-pi's, and says no matter what you do to the non-pi's, they will never match the better flowing pi's. Go with the pi's and you won't regret it.

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