87fbodyy

its a 350 and behind my dist n the driver side it says 28 gm 3970010. i just wanna know what it came from. thanks, justin

AlkyIROC

010 is the most common casting from the 70's. It' could have been from just about anything.

1gary

Get the casting numbers off the heads.

sofakingdom

iTrader: (1)

It probably came from a Chevrolet or other GM car or truck from between 1969 and about 1980. Most likely a Nova, Impala, Corvette, C10, Malibu, Camaro, Monte Carlo, or Caprice.

Why do you think it matters what the BLOCK "came from"?

Since where THE BLOCK "came from" doesn't make the slightest difference to what the motor IS NOW, maybe there's some other way of helping you find out what you really want to know.

TreeFiddy

Case in point, I've got one of those 'CMJ' suffixed partial vin 010 blocks, that's supposedly an ex 70's police motor according to internet bs. The cops sure weren't catching too many bad guys back in the day with this thing, be lucky if it makes 200hp

87fbodyy

i really just wanna know what car/truck it came from n if I could find out performance specs thatd be awsome. heads# is 3998993 and I think this water pump# is 376444

AlkyIROC

Since it's not in the original vehicle, performance specs won't mean much. The heads, camshaft, carb and maybe pistons probably are not original.

sofakingdom

iTrader: (1)

The thing is, you can take ANY SBC heads and bolt them to ANY block. Then you can use ANY pistons and slide in ANY cam, and come up with ANY power output from 100 HP or less, up to near 500 HP, without using anything too unusual or exotic.

The newest that the block you have could possibly be, is around 22 years old. The odds of a motor lasting for 22 years with its original heads still on it is so close to zero that it's not worth even considering. Whatever that motor was when it left the factory, it is now something completely else.

Therefore, "what the motor came out of" tells you ABSOLUTELY NOTHING WHATSOEVER about what the motor IS NOW.

All of the parts that "match" a motor to an application are virtually always replaced or randomized when an engine is rebuilt.

To know what the motor is NOW, you need to also know what pistons are in it, what machine work (if any) was done to it besides just normal repair type stuff like vatting and boring out, and what cam is in it, in addition to the head casting #. Block casting # is almost completely irrelevant; the block you have was used in 160 HP 350 2-bbl Impalas and "LT-1" Corvettes, and every imaginable application in between.

The head casting # you have was used on alot of the super low-HP motors of the 70s, like the 160 HP truck 350 2-bbl type of stuff. It is also still used on the "260 HP" Goodwrench motor, which once it's installed in a chassis and has things like a water pump, alternator, real-world air cleaner, and an exhaust system, makes about 180 HP with a typical street 4-bbl carb and exhaust manifolds. Maybe 200 with headers on a good day.

If I were the guessing kind, that's about what I'd guess yours makes. But it could make more (though not a whole lot more) or could make less (could be quite a bit less). The devil is in the details.

1gary

The casting numbers do however give you a baseline idea of what you have or don't have I.E. if you thought it was a 350 and found it was a 262 or 305,that might be a determining factor in your plans for what you wanted.In the heads casting numbers if you found it was a 305 head on a 350 or for that matter a Vortec head.A historical casting number knowledge is one pc of the puzzle.

But as stated,what the current output is without a tear down,is very hard to do.And even at that(tearing it down) measuring the bores,finding it was .030 over,had what looked like a weird H/B over any you have seen on a 350 before,finding it has been clearanced on the pan rails,looking at the casting numbers of the crank,what?,it is a 400 crank,then knowing 22 yrs later it is a very early 400 crank stroker.But that is the best case and highly unlikely.

LOL-well one could only hope for you.

Let's get to the core of the issue.How much money do you have to spend??. Are you in the group who wants to spend whatever it takes??.

87fbodyy

well thanks for all your guys help. right now its bored .30 over, afr heads, comp cam, edelbrock performer intake n a holley 750 carb.. + some spray.(; i had the motor for a while now n always wondered what car the block came from

1gary

Oh-you meant exactly what you asked.LOL.

87fbodyy

yeaa lmao