im buying a what i think is a 350 engine block tommorrow evening.
that casting numbers are 3970010.
i forgot to check the casting for the date.
i was reading on a site saying that if its from 1968 its a 327 from 1969 and above are all 350s.
is that true?

and how do i tell what the engine it came from?
im wondering if it came from a car or a truck.
where do i look for that?

ill post some photos of the block tommorrow when i get it.


the bore size is 4.000

 

Same block It's the crank stroke that changes, and pistons are different. Besides, your torque flatens out quicker than a 350. Think 383, its stroke for torque!

Also crunch the numbers to rebuild a stock 327 vs. 350. Depending on what you want any build will get pricey.

To find what it came out of, try googleing chevy engine suffix. It'll show where and what to look for.

Good luck, just remember don't buy junk.

 

'68-'69, could be either a 327 or 350. As stated, it's the crank (and pistons) that make the difference. Pretty good odds that it's a 350.

What it came out of is pretty much moot. The only difference that makes is 2- or 4-bolt main, cam, and heads. The number of main bolts is also moot. Cam and heads are better to change than run what came in/on it, anyway.

 

i have a 68 327 from an impala SS, blew the doors of plenty of IROC'S i love my 327

 

Ditto for my 305 on steroids.

The 327 was a decent engine in its day (had more than one myself), but really isn't anything particularly special.

 

if it is a 327, its a truck engine from 1969 and is 2 bolt mains. if it is a 350, it could be anywhere from 1969 to 1980 and could be either a 2 or 4 bolt mains. so if its a 4 bolt, you'll know its a 350. but if its a 2 bolt, on the back of the engine there should be the engine size in liters, 350 is 5.7, im not sure what 327 is.

 

They didn't put the engine size on the casting back then. Obviously, since they used the same casting for two different engine sizes, that wouldn't be a wise thing to do.

 

i wasnt sure if they did or not, i just saw a 350 in the shop the other day with "GM 5.7L" cast into it. and since they used the same casting numbers for 2 engines, id figure it WOULD be a smart idea to also cast the engine size on it. unless u meant using the same casting number wasnt smart.

 

Also be aware the 327 came in small and large journal on the rods. I believe it was around 67 they changed.

 

An 010 casting is large journal. It first appeared in the '69 model year.

By the time they started casting "5.7" into the block, they weren't making the 327 anymore. And, as I said, they used the same casting for both the 327 and 350 (and, I might add, the '69 302). It didn't know what it was going to be until the crank and pistons showed up.

 

Why would you want to use a non-roller block from the 60's in your late-model car with a roller block in it??

 

You could add "one piece rear oil-seal" as another advantage of the later (87+) blocks.

However, if you want "all out power", the blocks from the 1960s had a higher nickel content which made them stronger and better able to handle high power levels.

 

thanks for the info
i whent to take some photos of the block but batteys dead!!!
i just got to take it in to a shop to check if there are any cracks in it.
im hoping there isnt.
anyways thanks for the info again