Bought a '71 parts truck with a running engine. At least it was a year or so ago. This engine has been swapped into 2 different trucks and I'm "told" it came out of a mustang. It's had external mods so I'm not even sure if the water pump is the original model. Where do I start in trying to figure out what it's original configuration may have been and what it, possibly, came out of? I'm pretty sure it's an HO 5.0/302. Intakes been swapped with Edelbrock and serpentine belt system installed. It has casted in oil cooler ports at the oil filter mount and studs sticking out of the water pump instead of just bolted on like the original 302 in my '70 F100. I tried to get it started using 15426378 but all I got was backfire. When I switched to 13726548 I got it to hit a couple of times but the 4bbl holley wasn't shooting gas right so never did get it to start. It has the 28oz weight on the flex plate and the harmonic balancer is lighter looking than the one on my '70. Also has the smaller car plug threads in the head instead of the larger truck plug thread. I'm going to take it apart and replace all seals and gaskets, including head so what should I look for while I'm doing it to try to nail this down some? Oh yeah, it came with a C4 tranny bolted to it.

 

hey
i just did this myself, look at the block at the rear just above the oil pan
i cant remnber which side its probably covered with dirt/grease
anyways it will tell you what it left the factory as......as mines like c90e-

once you get that number you can post it or call a ford dealer

 

Block casting number is to the rear down near where the starter mounts, head casting numbers are between the center intake ports on the head gasket side. From the description it sounds like you either have an '86 Mustang motor or a late '80's Crown Vic 5.0, if you can measure cam lift that will say for sure. You don't need to pull the cam to do this either, just setup a dial gauge on one of the pushrods with the rocker removed and rotate the engine 1 full revolution by hand.

 

Ok, found the block casting numbers. It's E3AE 6015 BA 22 and under that 4F18. Anybody decipher that for me? I'm gonna google around and see what I can find on it. Thanks! I'd never have found it if you guys hadn't narrowed it down for me!

 

try here: https://www.ford-trucks.com/forums/3...6-10-06-a.html

 

Yeah, checked there first. The more I search, the more conflicting information I find. Many sites says it's a 351W out of a full size car. Some mustang sites say it's still a 302. I'm going to tear it down some more and research more of the parts. I'm thinking the water pump will tell me something. There's some good detailed info here on water pumps. When I get it off and compare it to the pics I should be able to narrow that down. Isn't the VIN number of the car it come out of stamped on the block somewhere?

 

No vin on the block, the intake is wider on the 351 and the water pump mounting points are a little lower... there's a good pic of the differences on here but I dont have a link to it.

 

The block casting numbers won't ID the engine displacement you have to do that visually. One of the more obvious visual clues is the position of the distributor flange on the engine block with respect to the intake gasket surface, if they are at nearly the same level then it's a 302 but if the flange is about an inch below the intake surface it's a 351. This also applies to the waterpump inlets on the block, the top edge is flush with the head gasket surface on the 302 but about an inch below the surface on the 351.

The pic below is a 302 longblock for example...

 

For comparison here's a 5.8 shortblock..

 

Woohoo! Thanks Conan! It's a 351. About an inch difference in height from the distributor to the intake. The guy I bought the truck from said it was a 302 out of a mustang. Small (5/8 socket) plugs says it's a car engine, doesn't it? Since the cast date on the block was June 1984 that narrows it down to a Crown Vic. It had serpentine pulleys on it but I don't think it was original. They didn't line up well and the alternator bracket had washers behind it to shim it out. Probably doesn't have the right water pump on it either 'cause there's a piece of gasket showing that had a squarish orifice in it, passenger side, near the top. There's some info on water pumps on here but I can't find it now. I'll start disassembly and see if I can get more info from the casting numbers on the heads, timing cover, etc. I just want to know what year/model parts to ask for if need to go the parts store. Anything in particular I should look for that would be more definitive?

 

may be off the wall here, but that may be something interesting. If I remember right, ford used to use that 6015 number for cool stuff.
Another thing you can look for is a little protrusion sticking out on the drivers side front of the block, those were cast in Mexico, and are supposed to be thicker and stronger. Don't remember whether that was 302, 351, or both, but know it was at least one.

 

I don't think the 14mm vs. 18mm spark plugs is related to truck or car usage, it's simply that early heads used the larger 18mm. Sometime in the late 1970s or early 1980s Ford switched them to the smaller 14mm.

Another difference between 302 and 351 is that the former uses 7/16 head bolts while the latter uses 1/2.

 

There's nothing special inre to 6015.

6015 is nothing more than the bare block casting basic number, regardless of the engine size. Ford has used 6015 since 1908.

The Ford basic part number for every bare block is 6010, and has been since 1908.

Casting numbers cannot be cross referenced to actual FoMoCo part numbers. And...usually the casting/part basic numbers are different.

 

Thanks for input guys. The only thing I'm sure at this point is that it's the 351 block. I know it's not a Cleveland 'cause the water inlet's in the intake, not the block. I'm going to pull the valve covers and check valve lift and duration and then pull the heads and check bore and stroke. Also pull the bearing caps and plastigauge the bearing clearances to get an idea on the wear on the crank. Just looking for a decent motor for my '70. The original 302 has 260K miles on it and she's using oil with low oil pressure. No smoke yet so that's good. Bought the parts truck mostly for the fender, inner apron and power steering setup. The engine and tranny are just a nice bonus. She's a daily driver but I wouldn't mind a couple extra horses if I have to pass somebody. I never tow and follow the speed limit always. Fortunately, it's 70 on the highways around here Mostly looking for a sound engine that'll last me awhile. I only put about 5K miles on the road a year. Just trying to figure out what it may have came out of so I'll know what parts to ask for at the parts house.

 

If it was running before and you only drive 5k miles a year, I'd be inclined to throw it in there and see how it does