Hey guys,
Well I think my 78 F-250 4x4 is no longer. I put a electric fuel pump on to force feed the mechanical last week. Holy cow made a huge difference, it ran great drove her about 25 miles no problems. Anyway went to go hunting Sat morning hit the ignition and valve cover gasket and bolt went everywhere along with an amazingly loud boom. So in the mean time I am buying a 77 F-150 4x4 tomorrow. So my question is the guy tells me it is a 351 but I think it is a 302. My F-250 has a 400 in it, and I think the 351m looks just like it. So can someone tell me the difference just by looking that this F-150 has a 302 in it. Thanks

 

hmmm wierd, i dont think its related to the new electric pump, why dont you pull off the head of the side that blew off to see how bad is it?? post pictures, or what do you see on the top of thehead?

 

Thanks guys for the quick replies. I am going to pull the valve covers either tomorrow night or sometime this weekend. I will let everyone know what I find. Some more info on what I did. It also has an edelbrock 1405 on a performer intake. That is all the perfromance change. I put in new lifters that came with a stock cam from Napa also new timing chain and gears. Just changed oil last thurs 20w -50 because of low oil pressure and one bottle of Lucas. Original rockers and Valve springs but heads were shaved at local machine shop when head gasket blew. That is all I have done.
The F-150 that I am buying has a 4 speed manual that I am excited about hopefully if it does indeed have a 351 I will swap both into my F-250.

 

I have a 351 M from a 77 F150 with a C6 and have had no problems with it, its a great engine!!

 

Sounds to me like you may have pushed fuel into the crankcase thru the mechanical pump. The fuel vaporized and fired in the crankcase, which you are lucky you didn't blow off as well. I have never seen this happen but did hear of it and saw a guy with his head gashed open by the oil fill cap on a flat head v8 hitting him as he tryed to start the engine. kotzy

 

1969/79: No 302's were factory installed in F100, F150 4WD's.

No 302's were ever factory installed in any F250/350.

4WD engine availability:

1959/64: 223 I-6 / 262 I-6 (1961/64) / 292 2V.

1965/67: 240 I-6 / 300 I-6 / 352 2V.

1968/72: 240 I-6 / 300 I-6 / 360 2V.

1973/76: 240 I-6 (1973/74 only) / 300 I-6 / 360 2V.

1977/79: 300 I-6 / 351M 2V / 400 2V.

No 460 4WD's till 1983.

First Ford factory 4WD's: 1959 F100/250.

 

Many electric pumps require a regulator to lower the pressure. The carb can't hold back excessive pressure.