99 StangGT v/s Grand Marquis Engine - Mustang Evolution

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Old 05-01-2006, 08:05 PM   #1
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99 StangGT v/s Grand Marquis Engine

I have a 97’ Auto Trans. Mustang GT with high mileage engine (185,000)

Junkyard is selling me a 99’ Marquis engine ($800) all included.


Main difference between the 99’ 4.6 Mustang engine and Grand Marquis?

Are PI heads the same?

Intake manifold?

Crankshaft 6 or 8 bolts?

Compression ratio I think is not same.

Can I do the swap with confidence?

Would I get same HP? …as if, I do the same swap with a 99 Mustang engine.
Thx!

Of course, fuel injection and computer stuff out of discussion. Just engine block, heads, and intake.
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Old 05-02-2006, 06:09 PM   #2
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Re: 99 StangGT v/s Grand Marquis Engine

If you are driving a 97 GT, you do not have PI heads. Those started in 1999.. I believe the blocks are pretty close the the same, although I would still have a knowledgeable engine shop mess with the swap. If you are on a seriously tight budget, I would recommend getting the heads on the grand marquis motor ported and polished before you put them back on and have the intake port matched while it was out...
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Old 05-06-2006, 08:12 PM   #3
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Re: 99 StangGT v/s Grand Marquis Engine

Quote:
Originally Posted by bullitt482
If you are driving a 97 GT, you do not have PI heads. Those started in 1999.. I believe the blocks are pretty close the the same, although I would still have a knowledgeable engine shop mess with the swap. If you are on a seriously tight budget, I would recommend getting the heads on the grand marquis motor ported and polished before you put them back on and have the intake port matched while it was out...
Work schedule tight, sorry for the late THX!!
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Old 05-06-2006, 09:22 PM   #4
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Re: 99 StangGT v/s Grand Marquis Engine

will have to swap over oil pan, oil sump, possibly front cover (depending on locations..) and the upper/lower intakes (as far as I know.. I might be thinking the PI motors on that note..) once your old motor is out just compare to see what needs to be swapped, but they are modular motors for a reason haha
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