351W transplant help needed

cardude · Jun 25, 2008

I scored a 351w from a 91 F-250 with 40K on it. I need some pointers on what needs to be done to get it to fit into a 66 coupe.

I know its FI and I dont have the harness or ECU, so should I go find one and keep it EFI or go carbed. it also has the hump/saddle oil pan and was not sure if that would fit and if not, what is the best approach to changing it out? will 289 pan fit? will 289 oil pump work in it?

Any skilled knowledgable help would be greatly appreciated!

D.Hearne · Jun 25, 2008

You'll need a front sump 351W pan. The 289 pan doesn't fit 351's. Easier to carb it, just swap the intake and distributor. The 289's timing cover will work too. But you'll have to adapt the accessory brackets for the higher head position.

rc4mike · Jun 25, 2008

i am in the process of doing the same with a 94 bronco 351 efi. After doing a little research i decided to trash the speed density efi in favor of more modern mass air flow. So had to get new intake, harness, computer, etc. Tossed all the smog junk as well. In the end i took it down to a bare block and am having bored and stroked to 408 with new heads, etc. Could have bought a block for 350 from my engine guy....but it sure was fun learning how to pull the engine and strip it down. If you stay efi then you also need fuel pump, return line, regulator, etc. Man is this harder than i thought. Should be great when done. SHould have engine back in 2 weeks.

Mike

cardude · Jun 30, 2008

thanks for the help so far!! I have the intake and distributor on order now, was wondering if a 7psi or 14 psi pump be better running 650 CFM carb??

Looking at the engine with the stock logs it looks way too wide, any suggestions on best approach to clear the shock towers??

Lastly, can I still use the Z-bar or do I need to switch to cable clutch??

thanks again!

SMOKEDYA · Jun 30, 2008

you might need to massage the strut towers to get it to fit? i dont know a whole lot on these older stangs. hey i'm in vancouver wa and building a 351W for my 93 coupe. will you kick down the EFI intake and fuel rails to me if your going to trash them or sell them to me for a super super cheap price? I have some 1974 351W heads in good shape i could trade you if wanted? also i would be intrested in the dizzy out of the engine for EFI also!I'm trying to do a budget build for now on mine. P.M me or call 360 241 8025 or email me at ugot8byaford@yahoo.com peace

john

cardude · Jun 30, 2008

not sure if you want this stuff its out of a 91 F250, does not use the MAS air flow, instead uses speed density unit. it is also a huge beast, and I am sure it would not fit under a hood. I will send you the details though!

SadbutTrue · Jun 30, 2008

As someone with a 351w in a 66 coupe ...

You should not need any 'massaging' to the shock towers. If you have headers, a couple plugs are gonna suck, but it'll be worth it (351s are basically big blocks in these little cars).

I believe the entire 289 water pump/timing cover will work.

I've always been told carbs like ~6psi. Not sure where I heard that, but I think 7 should be fine.

I use carb. There are lots of people who use EFI and like it. I don't think its worth while unless you are in a cold environment and/or demand your car be a daily driver. Its easier and cheaper to get performance out of carbs.

I actually have some 1970 heads (D0OE) that I just pulled off my engine, along with some other parts if you wait a week (performer intake, 600 cfm edelbrock, etc). The 69 and 70 heads are generally considered the best stock 351w heads, and the ones off my car are in excellent shape. Lemme know..

cardude · Jun 30, 2008

great yes I would be interested in some parts... okay now to sounds like a real newb.... do I need to change the timing cover with the 289 or can I just run what is on it?? I am going with the electronic fuel pump so I dont need to access hole for the manual pump. I just keep hearing this so it raises a flagin my brain to ask why?

thanks!

SMOKEDYA · Jun 30, 2008

cardude said:
not sure if you want this stuff its out of a 91 F250, does not use the MAS air flow, instead uses speed density unit. it is also a huge beast, and I am sure it would not fit under a hood. I will send you the details though!

Well i would like it! i have all my mass air stuff off my 93 that will work. the hood is no biggie i just want to get it in and running, i plan to go with a cowl hood anyways. are you the guy on craigslist here with this stuff for sale? peace

john

cardude · Jun 30, 2008

yup thats the stuff on craigslist! I will give you a call later after work.

SadbutTrue · Jun 30, 2008

cardude said:
great yes I would be interested in some parts... okay now to sounds like a real newb.... do I need to change the timing cover with the 289 or can I just run what is on it?? I am going with the electronic fuel pump so I dont need to access hole for the manual pump. I just keep hearing this so it raises a flagin my brain to ask why?

thanks!

I'll send you a pm with what I have (if all goes well, there should be a post in a few days in classifieds too, fingers crossed).

I believe 289-302-351 timing cover assemblies are all compatible. The one issue you have is with different accessory brackets, so you need to make sure you match all that up. If you have a complete 289 timing cover/water pump/alternator/power steering assembly, it'd probably all work together, for example. But there are a lot of different combos so I can't make an all-inclusive gaurantee.

Not sure on the electric water pump. I would thinkt he cover itself wouldn't change, but don't have experience enough to say for sure.

SMOKEDYA · Jun 30, 2008

cardude said:
yup thats the stuff on craigslist! I will give you a call later after work.

ok thanks i called your number and left a message this morning didnt know it was you tho. peace

john

D.Hearne · Jun 30, 2008

cardude said:
thanks for the help so far!! I have the intake and distributor on order now, was wondering if a 7psi or 14 psi pump be better running 650 CFM carb??

Looking at the engine with the stock logs it looks way too wide, any suggestions on best approach to clear the shock towers??

Lastly, can I still use the Z-bar or do I need to switch to cable clutch??

thanks again!

All carbs need the lower pressure pump. The only function the pump has is to resupply the fuel bowls with fuel. The lower pressure is needed to avoid pushing the float down into the fuel in the bowl. The pressure does not pump fuel into the engine. This isn't fuel injection. The pressure differential in the carb venturis while the engine is running is what pulls the fuel from the bowl into the throttle bores. Too much fuel pressure and you have the pressure sinking the floats, opening the needle vavle (this is what the float controls) that allows fuel to enter the fuel bowls, if the pressure sinks the float, fuel continues to fill the bowl and eventually it over runs up and out the bowl vents and either runs into the throttle bores and floods the engine, or runs out onto the top of the intake manifold, creating a fire hazzard. A 351W will fit between a 65-66's shock towers (unless the chassis has weakened and the towers are bent toward each other) Hedman makes a set of swap headers for the 351W into these cars. The Z bar clutch can be retained, but you'll need the adapter bracket for the pivot hole that's missing from your newer block. Many of the classic Stang vendors sell this bracket.

351W transplant help needed

cardude

D.Hearne

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rc4mike

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cardude

SMOKEDYA

cardude

SadbutTrue

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SMOKEDYA

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D.Hearne

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