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Old 10-22-2012, 10:33 PM   #1
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PI HEAD SWAP

Hey guys, I've been searching the forum for a couple of answers I need but got tired of reading lol. I have a 98 GT with cai and full exhaust. Thinking about do the PI swap with my tax return. Heard good things about it and sounds like the best mod for power gains money wise. Just wanting to get a list of everything ill need and maybe if someone has a link to a writeup about it. Thanks!
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Old 10-22-2012, 10:45 PM   #2
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A guy down the road from me has an 01 4.6 out of a gt lower end is seized though. Idk if bending the valves is possible on them either.
Anyways, he's wanting $50 for the whole thing, throttle body to oil pan. So I am thinking about doing that swap too on my 97
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Old 10-22-2012, 11:17 PM   #3
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My 96 has pi heads i think it deff improved it with everything else i got. It does bump ip compressiin to 10.52:1 if i remember but deff an improvement from our non pi heads. Many will say trick flow heads are better and that is true too....though some wallets aint deep like others lol
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 10-23-2012, 04:31 AM   #4
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The write-up I used when I did mine back in early '06 was on a forum that no longer exists, but I found this one. Merry Christmas.

1996-1998 Mustang GT PI Swap - DIY Tech Guides for 1994-1998 Mustangs V6 & GT
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Old 10-23-2012, 01:00 PM   #5
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So what all do I need? Im looking at the heads on LMR for $399 each. What else?
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Old 10-23-2012, 01:23 PM   #6
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Read the link I just posted. And buy used heads.
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Old 10-23-2012, 02:29 PM   #7
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Quote:
Originally Posted by GSRGuy94
Read the link I just posted. And buy used heads.
+1 go to a junk yard. That's prolly bout the cheapest place.
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Old 10-23-2012, 02:32 PM   #8
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Car-Part.com--Used Auto Parts Market
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Old 10-23-2012, 10:04 PM   #9
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Quote:
Originally Posted by taylor98gt View Post
+1 go to a junk yard. That's prolly bout the cheapest place.
+1 deff alot cheaper than buyin them new cause its probably only heads ur gonna buy from lmr and u also need the intake manifold for the pi swap. best bet is either junkyard or someone on craigslist selllin them also helps. as to installing them shouldnt be hard at all, go by the link that he posted on this thread and you will be fine.
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Old 10-24-2012, 03:00 PM   #10
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What kinds of gains could be seen by converting to a DOHC top end setup similar to 97/98 cobras?
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Old 10-24-2012, 08:55 PM   #11
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Anybody? ^
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Old 10-24-2012, 11:34 PM   #12
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Much better than a 2v...id say atleast 300hp bph
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 10-25-2012, 04:48 AM   #13
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Quote:
Originally Posted by 1996mustang
Much better than a 2v...id say atleast 300hp bph
I'd expect more than 350. I'm doing bout 350 on SOHC 2V, 04 PI head swap.
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Old 10-25-2012, 04:53 AM   #14
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Quote:
Originally Posted by LAS97GT

I'd expect more than 350. I'm doing bout 350 on SOHC 2V, 04 PI head swap.
What else have you got other than pi heads?
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Old 10-25-2012, 05:18 AM   #15
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^what he asked. If I could get 350hp out of pi swap that'd be great. What are your other mods?
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Old 10-25-2012, 06:58 AM   #16
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Heck I had a fully built 5.0 stroker 2valve, heads, stage 3 cams, Vic jr intake and good tune and only laid down 425hp
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Old 10-25-2012, 10:20 PM   #17
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*subscribed* good luck im planning on doin the swap myself i already have the pi heads n cam of an 02 gt just need to save to get the pi manifold and gaskets n stuff..
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Old 11-18-2012, 11:18 PM   #18
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So I found used heads and cams for $250, and an intake manifold for $100. Should I jump on this?
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Old 11-19-2012, 12:39 AM   #19
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Absolutely. As long as they are in good shape. I'd have the heads milled down just enough to clean up the surface; as small as a machine shop recommends. You'll want a 93 octane tune as well, because the compression is gonna be higher (duh).
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