hi guys
have not been on in a while,but maybe somebody can help
i recieve this engine with a car i bought and need to know what it is?
left deck number=15k427650
check mark 0529cmj
back block number=gm 39700010
thank joe68

hi guys
put this post in a few other to get a quick reply,i recieve this motors with a car purchase and need to know what it is?
deck number" batteries side deck number or passenger side=15k427650
then a check mark and 0529cmj
gm block 39700010
thanks joe68

The 010 block is an older 327/350 block. It's among the first of the large journal 4.000" bore blocks. It won't be a 327 if it's newer than 1969 or has 4-bolt main caps.

well,not really sure,but i think it a 1975 ,but the three zero throw me off,and the more i try to find out the more i am confuze. i remove one head so far and measure bore and it look to be 4.0. will do more tommorrow.

my mistake

too many hours working

3970010 not three zero

15k427850 not six
will remove pan tommorow

The numbers stamped on the RF deck are as follows:

http://72.19.213.157/files/SBCCaseID.jpg

The numbers on the LR ledge (behind the distributor and oil pressure port) are as follows:

http://72.19.213.157/files/SBCCastNumbers.jpg

You can check the casting numbers at www.mortec.com which would reveal:

3970010....302.....69....4 Bolt...Z-28 Camaro
3970010....327.....69....2 Bolt...Trucks and industrial
3970010....350...69-80...2 or 4 Bolt

Basically, you have the generic 4" bore block used for about eleventy-jillion engines. At least it isn't a 305.

The design number will give you a little more information. You can decode some of that at:

http://www.nastyz28.com/sbchevy/sblock.html

If the engine is disassembled to any degree, you can usually find some hints in the timing chain area and at the flywheel end. If you find the numbers "010" and/or "020" cast into the block at those locations, that indicates the block is cast with an additional 1% tin and/or 2% nickel to aid durability, casting stability, and machinability. The tin also helps resolve inherent gray iron casting porosity. These blocks are generally considered better candidates for building to higher power levels, even if they are "only" two-bolt main caps. Actually, the two-bolt block are better, IMO, since they can be fit with aftermarket splayed 4-bolt caps which are stronger than factory 4-bolt (straight) caps.

One thread per question, please. Trust me - We'll find it.

sorry about that,so i thanks you for the information,but is their a way to ,
to detimed if it a 350 or 327? do they use the same block and crank? what make them diff? the heads? can i be safe to have this rebuild and expect a solid running motor out of it? it going in a 68 chevelle and not too concern on getting it to really really high hp.just a solid street motor.

when and what car was the last 327 put in? and when did they start the the 305?

when and what car was the last 327 put in? and when did they start the the 305?

1969 = last year of 327
1976 = first year of 305

If you follow the date/time code solution that Blue Bowtie posted above, you will pretty much determine what it is.

The two engines use a different stroke. The crank you're most likely to run across for that block in a 350 is casting number 3932442. 3941174, 3911001 or 011 puts it at a 327. These numbers are for cast cranks (small parting line).

There are more casting #-s here - http://www.mortec.com/cranks.htm. You can determine what you have with these castings - the only displacements you're interested in with that block are 302, 327 and 350.

well i gave up on trying to upload pictures, so i found the date code to be on the other side ,the crank is a two bolts, and the casting on the crank is=3932442 and date code =e285 block date code is e275

well i gave up on trying to upload pictures, so i found the date code to be on the other side ,the crank is a two bolts, and the casting on the crank is=3932442 and date code =e285 block date code is e275

Then you have a 350 on your hands. (silicon posted your crank number above your post.)

ok guys lets test your expertize

block cast number 3956618
cast in front of gm is the numbers 19
right front pad v0307hu

Then you have a 350 on your hands. (silicon posted your crank number above your post.)
thanks guys for the help,talk to machine shop and we are going to build it for the chevelle.taking ideas for this project,i looking for a solid street,dependable,fast but not high hp needed,i like to drive!

ok guys lets test your expertize

block cast number 3956618
cast in front of gm is the numbers 19
right front pad v0307hu

302 from a 69 camaro :P

Its not hard to find out were it came from, go to google type in "chevy block casting numbers" and trhe first site is a mortec one, look for the number there. They tell you engine size, year, and number of main bolts

am i right in my thinking,that the only way to tell the 302 from the 350 block is in the bore? beside the casting on the crank.

1976 = first year of 305


Oooh! silicon is usually right on the money - Let's see if we can trip him up on trivia...

Are you saying that the 305 did not exist (in a Chevy) in 1960-66?


BTW - The 302, 327, and 350 all have a 4.001" bore. The only way to differentiate is the stroke, or the resultant crank casting number. Since some builders assembled 302s with 2.45" spacer mains (or aftermarket medium journal cranks) even the mains sizes don't always follow suit. If you have a ruler graduated to at least ¼" resolution, you should be able to determine what you have. It is even easier if at least one of the pistons/rods is still installed. A 302 has a 3" stroke, a 327 has a 3¼" stroke, and a 350 has a 3½" stroke (3.48" actually, but your scale probably isn't graduated in hundredths). Besides, true 3.500" stroke cranks are commonly available, but I'm confusing you enough already.

Oooh! silicon is usually right on the money - Let's see if we can trip him up on trivia...

Are you saying that the 305 did not exist (in a Chevy) in 1960-66?

Not as a V8, but it certainly existed as a V6 usually found in trucks such as GMC and the Apache... IIRC, it was a 6-cylinder version of the 409.

now you talking , that was a really good explaination for me.
very well put! i thanks you for clearing that up for me.
so if i set up a idicator off the block and onto the piston and crank motor
i will get exact stoke?

a v6 between 1960 and 1966? in a truck?

yeah and the 4.3 v-6 that was always in old s-10's is actually a 350 with two cylinders missing, i believe anyways.

also, wouldnt a 302 rev pretty damn high with that short stroke? i have heard stories of 283's revving up to 10000 but i dont buy it unless maybe they had a lot of mods, especially in the valvetrain.

10K may be a little high, but 8-9K is possible with light pistons in a 283.

now you talking , that was a really good explaination for me.
very well put! i thanks you for clearing that up for me.
so if i set up a idicator off the block and onto the piston and crank motor
i will get exact stoke?

Yes. But you really don't even need an indicator. If a head is off (or oil pan is off) and you bottom a piston, measure to the deck, then stroke the piston to its opposite end, you should have the stroke. Since there is a quarter-inch difference between cranks, a scale should show the stroke. If you have a 4" travel indicator, that would work, too, but it's overkill.

Yup - Couldn't fool silicon212. He picked up on the V-6 out right away. You can usually trip up some people asking about the "305" with that one. That engine family included the 305, 351, 379, 401, 432, and 478 V-6s, plus the 637 V-8, and the 702 V-12.