90’ Grand Marquis 5.0 Build

[Slowstang98]

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

 

[General karthief]

I believe the are not ho engines, maybe if it's a cop car (p71?) But not sure. Maybe @madmike1157 or @Noobz347 can chime in

 

[CarMichael Angelo]

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

 

[Noobz347]

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.

 

[LaserSVT]

Not worth the build. Its a $400 car. A pushrod 5.0 can be built up cheaper and easier than a Mod swap.

 

[rancorkeeper]

... 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

In a word, no. It's a non-HO motor - I believe they were rated around 150hp & 270tq. Much better stock V8 options out there if you're looking for a pushrod motor to do an engine swap.

 

[Mustang5L5]

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

 

[90sickfox]

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.