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Unread 01-24-2010   #1 (permalink)
98mustanggtbbk is offline Apprentice


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Question 1998 GT 5.4 Ford lightning head swap?

I have a 98 gt and i found some heads off a ford f-150 harley davidson edition with the supercharged 5.4. i was wondering if these heads would work on my 4.6 2v? also could i use the p.i manifold? and what would have to be moved? thanks
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Unread 01-25-2010   #2 (permalink)
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if the head off the f 150 is a 2 valve it should work i believe. the new trick flow heads for 2 valves are the same head that can go on both the 4.6 and 5.4 so im just guess that they would though maybe someone eles can give u a little more info... i think the only problum u might run into is the coolant flow make sure they meet up in the right places
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Unread 01-25-2010   #3 (permalink)
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They are the exact same head as the 4.6 PI head.
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Unread 01-26-2010   #4 (permalink)
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Default mustang heads

so the 5.4 2v heads are the same as the 4.6 2v pi heads and are interchangeable cause i have 1998 f150 5.4 and 1998 mustang gt.
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Unread 01-26-2010   #5 (permalink)
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Yes, 5.4 heads and 4.6 heads are identical. Both of your vehicles have the same NPI heads on them.
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Unread 01-26-2010   #6 (permalink)
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i dont remember the exact specs so im not going to correct anyone. ill check back in once I know for sure.
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Unread 01-26-2010   #7 (permalink)
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Quote:
Originally Posted by oneFASTmustang View Post
i dont remember the exact specs so im not going to correct anyone. ill check back in once I know for sure.
What correction? I know for a fact that the Lightning/Harley Edition 2V heads are the exact same heads as what's on a PI GT. There are minor differences between the Romeo and Windsor heads, but those are readily known.
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Unread 01-26-2010   #8 (permalink)
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My correction is more of a point.... The corresponding intakes need to be used because the gasket flange is unique.

Just needed to check where I wrote down the differences and commented to remember to do just that later in the day.
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Unread 01-26-2010   #9 (permalink)
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He'll just have to get the intake and gaskets for the 4.6 PI Mustang along with the coolant tube, there's nothing special involved, it's a standard PI swap.
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Unread 01-26-2010   #10 (permalink)
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How much hp would you think this would bump me up too? the heads are rebuilt and port/polished. i have a cai plenum full exhaust throttle body what would you think my hp is at
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Unread 01-26-2010   #11 (permalink)
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Quote:
Originally Posted by Bullitt5339 View Post
He'll just have to get the intake and gaskets for the 4.6 PI Mustang along with the coolant tube, there's nothing special involved, it's a standard PI swap.
yup. I just thought it was worth mentioning to him.
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Unread 01-27-2010   #12 (permalink)
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Quote:
Originally Posted by 98mustanggtbbk View Post
How much hp would you think this would bump me up too? the heads are rebuilt and port/polished. i have a cai plenum full exhaust throttle body what would you think my hp is at
A typical PI headswap with all the trimmings adds about 50rwhp. It all depends on who ported the heads as to what gain that adds, home/amateur/non-4.6 guy ported heads typically don't perform as well as stock, while heads from Patriot, Fox Lake, MHS, etc are worth 20-30rwhp.
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2001 Dark Highland Green Bullitt
12.25@110 naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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