90’ Grand Marquis 5.0 Build


Active User
Nov 19, 2017
Hi everyone I just got a sweet offer on a good running 1990 grandmarquis 5.0. I have a 98 gt and either wanna buy a foxbody or 5.0 swap this? First off is a 5.0 swap possible? And second off I don’t know much about the marquis 5.0 and want to know if it’s worth building or if it’s similar to the fox 5.0
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CarMichael Angelo

clearly, I’ve got something going on in that hole
SN Certified Technician
Nov 29, 1999
Birmingham, al
I don't know nothing bout birthing no babies.

I also don't know nothing nothing bout the different versions of a 5.0 between models and model years
So......lets put it where there is a high likelihood of somebody else seeing it that does.

There.....see how easy that was? @karthief
Last edited:


Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
Box behind Walmart
I think @LaserSVT might be able to answer this but if not, maybe knows who can.

I can tell ya that "any" motor swap into that car will likely not be financially feasible but other than that, you can put pretty much any motor into any car.


i'm familiar with penetration
Mod Dude
Feb 18, 2001
Not much is usable off it. You are pretty much going to spend more money searching for all the odds and ends you will need. The ECU is batch-fire, and the wiring is speed density as well. Injector harness is pinned incorrectly for the non-HO firing order. The heads are E6SE heads, the intake and Tb are the early 1986-style Mustang manifold which is tiny. Cam firing order is the non-HO order.

I wouldn't buy the car for a 5.0 swap. Buy yourself a 96-01 Ford explorer/mountaineer 5.0 engine and then find a clean 4-cyl and do a carb swap setup, or if you want EFI you'll have to search down the expensive 5.0 Mustang ecu and wiring.

However, If you already have a 1998 GT, just do a 99-04 PI head/cam/intake swap to that car, with an aftermarket plenum and TB and full exhaust and you'll be at the 300 crank HP range anyway. I don't even know why you'd bother with a 5.0 pushrod swap unless you are swapping in an AL-headed 347 or something like that. You can probably buy the PI swap parts for about what you'd pay for the marquis.

PI swapped '98 2V 4.6L > Gran Marquis 302 engine


I didn't really have an issue with the stink...
SN Certified Technician
Mar 2, 2015
I vote to stay away from the Marquis. The engine isn't worth it....neither is the transmission.

There are a lot of differences between your car and a fox.

Grab an old running Lincoln navigator and take the 32 valve engine out of that. You'd be better off.
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