351 and an 84...

explicitone · 05-01-2002, 01:47 AM

How easy would it be to drop the 351 into the 84 mustang? I would like to go carb'd supercharge, due to the lack of BS for EFI systems on install.....

Thanks for your help

jerrys84 · 05-01-2002, 04:22 PM

any motor, will fit in any car!

just depends on how much work you want to do.. is the 84 a v-8 car??

what rear end 7.5" probly. that's alot of additional hp and torque to try and put through that rear end..

also need to take a look at stopping power....

not sure how much more, if anything, a 351 weighs.. maybe front suspension upgrade??

definately will need subframe connectors..

explicitone · 05-02-2002, 03:55 PM

I have a smashed 87 5.0 lx for the rear end , and brakes , and susp. cause the 84 my buddy is getting it for 300 cause it has a blown motor . and we are thinking about putting a mighty mite c4 in the car for the trans sub frames wear already on the list as we as a 8 point cage.

84LX89GT · 05-02-2002, 07:05 PM

It's pretty easy from what i hear to drop in a 351 instead of a 302. Here's are the only things that may need attention:
First off you need the right flexplate for the imbalance of the engine and has enough teeth that matches up with the starter....but that is easy.
If you want to keep the stock hood you'll either have to find a low-profile dual plane intake (like an edelbrock performer) or single plane intake (offenhauser makes a lo-pro 351 single plane and also a Edelbrock torker II).
The 351 has a taller deck height so you'll need headers for a 351 conversion, which is no big deal because there are lots of header manufacturers who have several 351 options for fox mustangs.
If you run the stock serpentine belt, you'll probalby need an aftermarket bracket to run the stock accessories....which are also fairly easy to find.
You may want to upgrade from the stock 2 core copper radiator to maybe a 3 core aluminum, not necessary, but a good idea.

Other than that it will fit in with no hassle, use the stock motor mounts, has the same bellhousing bolt pattern as a 302 so trans selection is awesome. You should have very little problems with that swap.

As for the supercharger, you could probably convert the paxton kit for mid 80's carbureted mustangs easily to work on what you're building. It has a housing that goes over the carburetor and the system is similar to fuel injected mustangs in appearance. That kit is a centrifugal kit. Also Vortech offers a carburetor housing for adapting one of their mustang kits as well, but it's $500 just for the sealed housing. This is centrigual as well. There are of course, the old style roots blowers out there that would require cutting the hood and are draw-through instead of blow through systems like the Vortech and Paxton kits.
I think B&M makes roots superchargers for 351's, but i can't think of any others off the top of my head.
Hope this helps,

explicitone · 05-02-2002, 09:27 PM

Thanks Guys, that was more then what i was looking for...

You guys Rock!

Unit 5302 · 05-02-2002, 11:21 PM

I believe there is a company out there that makes motor mounts that sit the engine lower for the swap allowing you to keep the stock hood as well.

The 351 weighs about 50lbs more than the 302. The only kmember that will not accept the V8 is the 3.3L I-6, which wasn't available in 1984. The I4, V6, and V8 should use the same K member.

05-01-2002, 01:47 AM	#1
explicitone Registered Member Join Date: Apr 2002 Location: racine ,wi Posts: 691	351 and an 84... How easy would it be to drop the 351 into the 84 mustang? I would like to go carb'd supercharge, due to the lack of BS for EFI systems on install..... Thanks for your help __________________ RUN IT STAIGHT AND RUN IT HARD ________ Novi 2000 60' 1.46 1/4 10.67 mph 126.5 _________

05-01-2002, 04:22 PM	#2
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	any motor, will fit in any car! just depends on how much work you want to do.. is the 84 a v-8 car?? what rear end 7.5" probly. that's alot of additional hp and torque to try and put through that rear end.. also need to take a look at stopping power.... not sure how much more, if anything, a 351 weighs.. maybe front suspension upgrade?? definately will need subframe connectors.. __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

05-02-2002, 03:55 PM	#3
explicitone Registered Member Join Date: Apr 2002 Location: racine ,wi Posts: 691	I have a smashed 87 5.0 lx for the rear end , and brakes , and susp. cause the 84 my buddy is getting it for 300 cause it has a blown motor . and we are thinking about putting a mighty mite c4 in the car for the trans sub frames wear already on the list as we as a 8 point cage. __________________ RUN IT STAIGHT AND RUN IT HARD ________ Novi 2000 60' 1.46 1/4 10.67 mph 126.5 _________

05-02-2002, 07:05 PM	#4
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	It's pretty easy from what i hear to drop in a 351 instead of a 302. Here's are the only things that may need attention: First off you need the right flexplate for the imbalance of the engine and has enough teeth that matches up with the starter....but that is easy. If you want to keep the stock hood you'll either have to find a low-profile dual plane intake (like an edelbrock performer) or single plane intake (offenhauser makes a lo-pro 351 single plane and also a Edelbrock torker II). The 351 has a taller deck height so you'll need headers for a 351 conversion, which is no big deal because there are lots of header manufacturers who have several 351 options for fox mustangs. If you run the stock serpentine belt, you'll probalby need an aftermarket bracket to run the stock accessories....which are also fairly easy to find. You may want to upgrade from the stock 2 core copper radiator to maybe a 3 core aluminum, not necessary, but a good idea. Other than that it will fit in with no hassle, use the stock motor mounts, has the same bellhousing bolt pattern as a 302 so trans selection is awesome. You should have very little problems with that swap. As for the supercharger, you could probably convert the paxton kit for mid 80's carbureted mustangs easily to work on what you're building. It has a housing that goes over the carburetor and the system is similar to fuel injected mustangs in appearance. That kit is a centrifugal kit. Also Vortech offers a carburetor housing for adapting one of their mustang kits as well, but it's $500 just for the sealed housing. This is centrigual as well. There are of course, the old style roots blowers out there that would require cutting the hood and are draw-through instead of blow through systems like the Vortech and Paxton kits. I think B&M makes roots superchargers for 351's, but i can't think of any others off the top of my head. Hope this helps, __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock) Last edited by 84LX89GT; 05-02-2002 at 07:10 PM..

05-02-2002, 09:27 PM	#5
explicitone Registered Member Join Date: Apr 2002 Location: racine ,wi Posts: 691	Thanks Guys, that was more then what i was looking for... You guys Rock! __________________ RUN IT STAIGHT AND RUN IT HARD ________ Novi 2000 60' 1.46 1/4 10.67 mph 126.5 _________

05-02-2002, 11:21 PM	#6
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	I believe there is a company out there that makes motor mounts that sit the engine lower for the swap allowing you to keep the stock hood as well. The 351 weighs about 50lbs more than the 302. The only kmember that will not accept the V8 is the 3.3L I-6, which wasn't available in 1984. The I4, V6, and V8 should use the same K member.