EFI 351

Mustang5L5 · Sep 14, 2010

Tossing some motor ideas around. Would really like to get something on a stand and build it up and then toss it in my car.

Was thinking of grabbing and explorer motor, but then thought why not a 351?

What is the weight difference between a 302 and 351? I know adding weight to the nose isn't good, but this is a weekend car...I'm not really road racing or anything.

I need a starting point 351. What is a good motor to get out of what car? Were the police crown vics roller motors? What about later trucks?

I want to use my cobra intake, so I'll need to track down a 351 gt40 lower. Can I put my gt40p heads on it? Will I need a different exhaust? Does it push the headers apart slightly?

Will it fit under stock hood?

What do I do about accessories? I need all of them....ps, ac, smog, alt, crank.

Worth it? Or just grab an explorer instead look into something else instead?

Shaolin Crane · Sep 14, 2010

Mustang5L5 said:
Tossing some motor ideas around. Would really like to get something on a stand and build it up and then toss it in my car.

Was thinking of grabbing and explorer motor, but then thought why not a 351?

What is the weight difference between a 302 and 351? I know adding weight to the nose isn't good, but this is a weekend car...I'm not really road racing or anything.

I need a starting point 351. What is a good motor to get out of what car? Were the police crown vics roller motors? What about later trucks?

I want to use my cobra intake, so I'll need to track down a 351 gt40 lower. Can I put my gt40p heads on it? Will I need a different exhaust? Does it push the headers apart slightly?

Will it fit under stock hood?

What do I do about accessories? I need all of them....ps, ac, smog, alt, crank.

Worth it? Or just grab an explorer instead look into something else instead?

Weight is about 75-100lbs more
GT40 heads will go on it, they both have E7's depending on the year, but even the gt40's are a bandaid for power on a 302, figure even worse on a 351

Ive seen people get them under the stock hood wit rubbing with drop mounts, but they are solid, so expect some shakin

Your accessories should work on 351, might have to mod the brackets a bit to fit them.

I say its worth it, if you get some aluminum heads to offset the weight and get some type of aggressive cam to help it breath. You'll need some type of swap headers so you might as well go long tube. But patriot, brodix, and pro comp heads are all very decent and well priced heads to get it going.

ttopstang · Sep 14, 2010

I think they started the roller motors in 94.

Your accessory brackets will work, I swapped all mine from my 302 and don't remember making any modifications.

GT40p's will work, but like shaolin said, they are only decent on 302's, so on a 351 not so much.

I've been told any long tube header would work, don't know if its true, I went with the bbk long tube swap headers and 351w swap h-pipe also from bbk.(would've been cheaper for an exhaust shop to modify my old h-pipe, not much different)

The gt40 lowers are pretty easy to find, they show up on ebay regularly.

mob · Sep 14, 2010

The GT40p's will work you just need to drill the bolt holes to 1/2". Only problem is you will need to use swap headers you will need to find some swap headers that will work on the P heads. A 351 swap is going to be a lot more expensive (relative), than just throwing in an explorer motor. An explorer motor (technically) should be a direct swap, the 351 will require purchasing new parts. Also if you go 351 I think it would be worth looking for a roller motor.

But like others have said, (I've always used this saying) 302 parts on 351 engines, make 302 power. Maybe not exactly but they will hold you back.

vristang · Sep 15, 2010

Here is a link to all the info I collected when performing/researching my swap...
351w Fox Body Swap

I did clear the stock hood, but it took some work...
Polymer mounts, 351w Lightning lower, comp cams polymer upper...
Had to mill down the upper intake an additional .700" IIRC
Some intake heights are listed here...
351w Intake Manifold Heights

Let me know if you have questions,
jason

ttopstang · Sep 15, 2010

Mine doesn't clear the hood, but I am also running a 1 inch spacer with solid motor mounts.

I couldn't connect the throttle linkage without the 1 inch spacer. I have the un-professional products upper/lower.

I would love to clear the stock hood.

95Vert383AOD · Sep 15, 2010

Go 351!

If you have the time to build on a stand why not go 351. Get a swap pan H/C/I. Whatever you want. Remember even with 302 parts on it, it should still outperform a 302. NO it wouldn't be optimal.

BUT

You have so much more room to grow. Take the slight weight disadvantage (motor will make up for it in Torque) And keep adding to it.

Roller motors would be the 95-97 truck motors.

Honestly if i had it to do over again....i would have built up a 460 block into a 557. One day...MAYBE

NIKwoaC · Sep 15, 2010

Aren't you a mod?

Taken from our own website:

http://www.stangnet.com/mustang-forums/589036-i-need-very-specific-website.html

StangNet noob.

For the love of God, don't put 40Ps on it. I'd be embarrassed to have that many cubes on tap and then barely make 300 to the tire because I cut corners on cylinder heads. Sounds like you're going to take your time on it, so might as well do it right... Go big!

EFI 351

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