pi swap
I ♥ Acer
Joined: Oct 2004
Posts: 327
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RE: pi swap
Before year 99 mustangs had what is called NPI heads. After they started using PI heads. A GT with NPI heads makes about 180 rwhp, a GT with PI heads makes about 220 rwhp. So swap in newer heads to get more power.
This swap is usually comes with porting, polishing, a valve job, improved valve train. Sometimes people install forget pistons and increase compression, in these cases a set of new cams is also used. With such mods 280 rwhp is possible with 2v 4.6L.
This swap is usually comes with porting, polishing, a valve job, improved valve train. Sometimes people install forget pistons and increase compression, in these cases a set of new cams is also used. With such mods 280 rwhp is possible with 2v 4.6L.
6th Gear Member
Joined: Jul 2003
Posts: 14,917
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3rd Gear Member
Joined: Sep 2004
Posts: 998
From: Amsterdam, New York
RE: pi swap
well eventually i wanted to do an engine rebuild....after researching a lil bit it looks like this is a main component to a rebuild.. so basiclaly i would just wait till i did that right?
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