351 swap

Reply Subscribe

Thread Tools

Search this Thread

Oct 7, 2007 | 05:53 PM

handsomerob

Thread Starter

Senior User

Joined: Sep 2007

Posts: 222

Likes: 0

351 swap

O.k. I know that this has been covered a bit before on here but I'm gonna ask it again. I have the opertunity to get a running 351W it is Carbed, My current 302 leaks oil and burns oil, I was going to get another 302 and rebuild it but I can't pass up a FREE 351W so my question is:

Can I rebuild the 351W as an EFI? I have no experience in rebuilding motors this will be my first and I was going to make it a winter garage project. I want to rebuild it so in the spring I can pull the tired out 302 and just plug in the 351W and have no worries.

If anyone has experience with this or knows a site or magazine or book that can assist in this please help me out.

Thanks.

Oct 7, 2007 | 06:45 PM

kcb37

Senior User

Joined: Jun 2006

Posts: 493

Likes: 0

I think you can. So long as all your sensor will plug into the block. You should have to get another intake manifold. I would suggest calling summit or jegs.

Oct 7, 2007 | 07:44 PM

Midnight88

Freshman User

Joined: Oct 2007

Posts: 39

Likes: 0

Well, depending on the year of you truck, you EEC wont work. If it's equiped with SD rather than MAF, the computer will either A) need re-flashed or B) Replaced. SD works on precise inputs. CID being one of the biggest ones and CFM through heads and intake manifold. You'll also need a different cam that the computer will at least somewhat like. I'm getting ready to do a simular swap on my 88' 150 but mine will be a 408 stroker on a lopey cam with a custom EEC tune. Hope thats somewhat helpful.

Oct 7, 2007 | 07:50 PM

Mr. M

Elder User

Joined: Oct 2006

Posts: 843

Likes: 1

From: Redmond, WA

This will work with a MAF SEFI setup or a reflashed ECU. You will also need a 351 intake, a wider fuel rail (you can modify your 302 rail) and wider Y pipe.

Oct 7, 2007 | 09:19 PM

handsomerob

Thread Starter

Senior User

Joined: Sep 2007

Posts: 222

Likes: 0

My question now is, is it worth the work getting a 351W carbed engine ready to drop in my truck or should I just build up a strong 302 so I can just drop it in hassle free? What would be the advantages of the 351 over the 302? and how many horses can I squeeze out of the 302 and still keep it reliable?

Oct 7, 2007 | 09:22 PM

Mr. M

Elder User

Joined: Oct 2006

Posts: 843

Likes: 1

From: Redmond, WA

The free 351w would be cheaper. The 302 takes a mean cam, massive head work, and other go fast parts to be worthy toting a truck.

If you could find a wrecked 351 to part out accessory brackets, EFI intake etc. the swap would be quite painless.