4.6 PI swap?
4.6 PI swap?
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Joined: Feb 2004
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From: windsor ont canada
PI heads will not solve the plug problem only 03 heads have the added threads.Even then there has been a few 03s with blowouts and it's still early in the game.For an extra 11hp it's not worth it .Don't forget a ported npi head will out flow a factory pi head.PI heads were more of a selling point than anything.
Last edited by matt_97xl; Sep 19, 2006 at 01:14 AM.
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Joined: Jul 2002
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From: Long Island USA
matt is correct, the PI heads do not automatically fix the plug problem.
What does help the plug problem is regular maintenance of the plugs at 20-25K mile intervals.
And yes, porting non-PI heads make them outflow stock PI's.
And while you're getting them ported, get inserts put in for the plugs and be done with it
What does help the plug problem is regular maintenance of the plugs at 20-25K mile intervals.
And yes, porting non-PI heads make them outflow stock PI's.
And while you're getting them ported, get inserts put in for the plugs and be done with it
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From: windsor ont canada
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From: South Kitsap County, WA
Originally Posted by jlouv420
What does that mean? What is PI? Sorry, newbie here.
Ford redeisnged the heads and intake for a performance gain. When added to a non PI block, the heads raise compression - something like 9.5:1. This may require an ECU tweek to keep the risk of detonation. I've never seen the numbers on a straight up non-PI to PI swap... with the additional compression and ECU tweek it's probably more than 11hp gain, but not enough of a gain to warrant the time and effort without more done to the engine simultaneously.
-Kerry
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