i recently bought a 86 trans am that has had its engine swapped. trying to figure out what it was swapped from and exactly what it is. numbers on the flange the trans bolts to are 39700014. under the valve cover on heads I found 3932441 k8. and in front passenger side behind water pumpi found T1113Cnn. Also what i think is a partial vin but was very faded and looked something like 10L15948C.

from what I've found its a 350 out of a 70's camaro. but not sure if all my referencing is right. hopeing someone with more experience with these have a better idea what it is/from.

thanks ahead of tome for any help.

 

Don't think you are far off ; the production years of the block casting # are consistent with the CNN engine suffix code

 

You have a garden variety 350 block from the late 70s. It has early smogger heads from the early 70s.

The numbers are UTTERLY WORTHLESS for telling you ANYTHING USEFUL WHATSOEVER. Here's why. Blocks are basically all the same; for any given casting # (or for that matter, any given bore size) from 69 to 85, they are all equivalent and interchangeable. The factory installed 4-bolt caps on some of them, but on no particular casting #; you can't even tell that from any of the "numbers" although a truck block would have been more likely to get those than one that was used in a car.

The things that are different from one motor to another are the pistons, the heads, the cam, the intake, the carb, and the exhaust. However, you already know that the block is from one year, the heads are from another, and the cam has been replaced, the intake and carb are most likely the ones for your car and not for the motor or are aftermarket, and the exhaust is DEFINITELY the stuff for your car and not the other one. Given that all that other internal stuff has been changed out, the short block has probably been "rebuilt", which means the pistons are now different, and instead of whatever they came as, they're now some aftermarket replacement ones (NOBODY uses "original" pistons in a "rebuild"). Therefore, no matter what the "number" would tell you the motor "came from" even if you were to find out exactly down to what color the car was and whether it had a tape player instead of just an AM radio, the motor you ACTUALLY HAVE NOW bears no resemblance whatsoever to what the BLOCK "number" originally meant, except that it's probably still a 350. But since all 350 BLOCKS are the same, functionally, that means exactly .... nothing.

Instead of fixating on the number, look at the parts and see what whoever built it, put in it. The number isn't going to help you make some decision; for instance, what parts are most likely to break, or what the next logical improvement will be. They won't tell you how much power the engine makes: if you really want to know that, take it to a dyno or the track. Whatever you need to know about that motor, the "numbers" aren't going to tell you, because the motor no longer is whatever the "numbers" represent.

Tell us what you REALLY want to know, and maybe we can tell you what to look at to find out. I can 100% iron-clad guarantee you though, those "numbers" aren't going to be the way to find anything useful out about it.

 

When I bought the car it needed freeze plugs so I took out the engine to replace those. While I had it out I replaced the oil pump with a hi flow 1 and while I had the pan off i looked around the lower half with my untrained eye and all I could really determine was it was a 2 bolt main. It has a 1406 edelbrock carb and edelbroke performer intake manifold. Also while i had the engine out i cut out the old exhaust manifold and put in headers.

Right now the we are putting in sub frame connectors sense its a t-tops and the floor is rotted out. So before we patch the floor we are tossing the sfc in.

I wanted to know what engine I had so I could it stared life as cause I figures it would give me a ball park to work with on horsepower and torque and where to make my next upgrades.

 

But just like sofakingdom says, it doesn't.