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Old 11-04-2013, 07:14 AM   #1
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Hey I have a 1997 mustang gt 4.6 2v auto. I want atleast 300hp. I bought the car in Dec 2011 it had 131,000 miles but odo clock doesn't work. Runs fine no problems. Burns a quart oil every 5,000 miles. Real miles unknown. Wanna do a little upgrade atleast 300hp. Was looking at mmr part #400600RA that the street mod 4.6 forged rotating assembly. If I get this what else needs to be done to the engine, heads? what esle shoud i buy and upgrade? Btw motor is stock with AM cold air intake. I plan on a shop doing the work. What price am I looking at for the upgrades? Any help we be appreciated
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Old 11-04-2013, 08:12 AM   #2
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Are you wanting 300whp or 300bhp? A PI head swap should get you in the 270ish to the wheels
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Old 11-04-2013, 08:22 AM   #3
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Whp. With a PI swap kit would i need to rebuild engine? Dont know how many miles
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Old 11-04-2013, 08:24 AM   #4
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You wouldn't need to rebuild it, but you can of you want. Unfortunately it takes a lot to reach the 300whp mark on a N/A modular. If you're looking at a new short block then I would just look at piecing together a Vortech at the same time.
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Old 11-04-2013, 08:29 AM   #5
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So a PI swap would give me maybe 270hp?
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Old 11-04-2013, 08:39 AM   #6
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I would tear it down rebuild it pi swap it heads cam call it good. Maybe nitrous if you want more
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Old 11-04-2013, 08:50 AM   #7
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About how much would that be $3000?
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Old 11-04-2013, 08:56 AM   #8
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Well a pi intake is like $190. Skip pi heads and use truck flows and depends on what ones you get on the price. Cams are $600 and nitrous would run around $600 unless you can find a local off CL.
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Old 11-04-2013, 09:18 AM   #9
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I see whole PI kits like $1400 is it cheaper to piece it
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Old 11-04-2013, 09:20 AM   #10
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That's with heads. You might as well get truck flow heads since they flow better out if the box than ported pi heads.
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Old 11-04-2013, 09:24 AM   #11
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Buy a set of used PI heads for like $500 (at most) have them rebuilt with a port and polish if you wish, toss in some cams, and then use the rest of the money for other bolt-ons or a rebuild.
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Old 11-04-2013, 09:26 AM   #12
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After port and polish he might as well have bought trick flows.
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Old 11-04-2013, 09:28 AM   #13
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Ok thanks for the help guys
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Old 11-04-2013, 09:28 AM   #14
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A port and polish doesn't run that much. He's looking at $1500 at most, I don't know the price of a good P&P off the top of my head, but I do know they don't cost more than a grand.
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Old 11-04-2013, 09:40 AM   #15
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It's pretty tough to break the 300whp mark in a modular 2v motor. The easiest is to go forced induction.

If your burning that much oil, and are serious about doing the PI swap, It may just be easier and cheaper to find a whole PI motor and swap engines. Do some checking at local salvage yards. The PI motors were in just about everything after '99. I have found many crown Vic's in salvage yards with low miles... My buddy just picked one up for $450 that had 70,000 on it.
As long as they weren't old police cruisers your usually good. These cars were mostly driven by older people who took them in every 3,000 for service.

After finding your new motor, put it on an engine stand and build it up before sticking it into your stang.

This was going to be the plan on my 98GT before it was totaled.

---------- Post added at 10:40 AM ---------- Previous post was at 10:35 AM ----------

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Originally Posted by 1lowGT View Post
That's with heads. You might as well get truck flow heads since they flow better out if the box than ported pi heads.
Do you mean trick flow? Yes if you have the cash! Defiantly go trick flow.
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Old 11-04-2013, 09:40 AM   #16
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Originally Posted by Skulls98GT View Post
It's pretty tough to break the 300whp mark in a modular 2v motor. The easiest is to go forced induction.

If your burning that much oil, and are serious about doing the PI swap, It may just be easier and cheaper to find a whole PI motor and swap engines. Do some checking at local salvage yards. The PI motors were in just about everything after '99. I have found many crown Vic's in salvage yards with low miles... My buddy just picked one up for $450 that had 70,000 on it.
As long as they weren't old police cruisers your usually good. These cars were mostly driven by older people who took them in every 3,000 for service.

After finding your new motor, put it on an engine stand and build it up before sticking it into your stang.

This was going to be the plan on my 98GT before it was totaled.
When you say build it up you mean cams etc
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Old 11-04-2013, 10:01 AM   #17
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When you say build it up you mean cams etc
Yes all the major stuff. Cams, pull the heads and have them ported/polished ect... These things are way wiser to do on an engine stand.
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Old 11-04-2013, 01:26 PM   #18
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Yes trick flow lol. OP they flow better than PP pi heads. I'm not sure how much a good PP cost. But if he pulls a JY pi motor it'll have high miles too unless you find a good one but then if he plans on doing PP on then he might as well do his original motor. Unless it's your dd. Then you could get a JY motor and work on it while you still dd your car then drop it in.
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2003 GT - full bolts ons, suspension, and drag radials
1998 cummins - 150hp injectors | FASS fuel kit | 4" straight pipe | 5" lift | BHAF | 20" wheels | edge juice w/ attitude | built auto trans with stall | closing in on 900tq | bigger turbo soon..

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Old 11-04-2013, 02:09 PM   #19
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Yes trick flow lol. OP they flow better than PP pi heads. I'm not sure how much a good PP cost. But if he pulls a JY pi motor it'll have high miles too unless you find a good one but then if he plans on doing PP on then he might as well do his original motor. Unless it's your dd. Then you could get a JY motor and work on it while you still dd your car then drop it in.
Yes that was my suggestion. Just run what he has for now while you build up the Salvage Yard motor. If you were going to swap heads anyway... ( gaskets, bolts, and a once over/possible rebuild) may as well pull them off the JY motor, PP and do the cams while it's on the stand. Once the JY motor is all done drop in Stang and then sell old motor for mod money.

Ultimately! Yes Trick Flow all the way. If you have the money and if you have another vehicle to drive while said parts are getting installed.
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Old 11-04-2013, 02:34 PM   #20
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Exactly!
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