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block numbers


joe68
10-30-2006, 08:20 PM
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

joe68
10-30-2006, 08:50 PM
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

silicon212
10-30-2006, 10:04 PM
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.

joe68
10-30-2006, 10:45 PM
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.

joe68
10-30-2006, 10:53 PM
my mistake

too many hours working

3970010 not three zero

15k427850 not six
will remove pan tommorow

Blue Bowtie
10-31-2006, 09:35 AM
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.

Blue Bowtie
10-31-2006, 09:41 AM
One thread per question, please. Trust me - We'll find it.

joe68
10-31-2006, 01:10 PM
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.

joe68
10-31-2006, 01:17 PM
when and what car was the last 327 put in? and when did they start the the 305?

silicon212
10-31-2006, 06:38 PM
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.

joe68
10-31-2006, 08:14 PM
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

capriceowns
10-31-2006, 08:40 PM
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.)

joe68
11-01-2006, 08:21 PM
ok guys lets test your expertize

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

joe68
11-01-2006, 08:23 PM
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!

capriceowns
11-01-2006, 08:43 PM
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

joe68
11-02-2006, 04:16 PM
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.

Blue Bowtie
11-02-2006, 08:40 PM
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.

silicon212
11-02-2006, 09:26 PM
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.

joe68
11-02-2006, 10:15 PM
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?

joe68
11-02-2006, 10:16 PM
a v6 between 1960 and 1966? in a truck?

jveik
11-03-2006, 08:47 AM
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.

GreyGoose006
11-03-2006, 09:43 AM
10K may be a little high, but 8-9K is possible with light pistons in a 283.

Blue Bowtie
11-04-2006, 07:19 AM
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.

seattletri
11-27-2011, 01:21 AM
joe68,

I was reading your following expertise test and found out that my block casting number match your test. I read further and found out I have a 302ci from a 1969 Camaro Z28. Where would I find the 'right front pad' number? I am new to muscle car code identification and just need some help. Mine is a 1968 Impala and was told I have the original 327 :-) Doesnt seem to be the case.

ok guys lets test your expertize

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

silicon212
11-27-2011, 02:04 AM
joe68,

I was reading your following expertise test and found out that my block casting number match your test. I read further and found out I have a 302ci from a 1969 Camaro Z28. Where would I find the 'right front pad' number? I am new to muscle car code identification and just need some help. Mine is a 1968 Impala and was told I have the original 327 :-) Doesnt seem to be the case.

ok guys lets test your expertize

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


This is a pretty good necropost here ...

The "right front pad" is actually on the block, directly above the right water pump outlet (on the LEFT when looking at the front of the block head-on, the even numbered side). It's a machined extension of the cylinder deck, where information regarding the block is stamped (usually information pertaining to the assembly factory plus a part of the VIN, usually the last 8 digits of the VIN for a '69 through '80 vehicle).

A '68 will have a large journal block, whether it's a 327 or 350. The block identification would be the same on either (as above, usually these were 3970010 - alternatively, just 010 - blocks).

To determine whether your engine is a 327 or 350, you could measure the stroke or pull the pan off the block and check the crank casting #. I've given the relevant numbers above. The 327 uses a 3.25" stroke where the 350 uses a 3.48" stroke. A 302 would have a 3" stroke. All would use a 4" bore, and beginning in 1968, a common block.

seattletri
11-27-2011, 02:29 AM
Thanks Silicon for the fast response. In this post thread, a 19 in front of GM then block code 3956618 is from a 1969 Camaro Z28? Here's what I have, without measuring the stroke, can you tell me the engine size?

block cast number 3956618
cast in front of gm is the numbers 19
right front pad v0422pa

Again, I am totally new to this engine decoding. I just purchased a 1968 Impala Convertible cloned SS327 and a 1968 Corvette Convertible with a 396 from a 1965 Corvettte. I didn't have a problem decoding the engine from the Vette. Thanks in advance.

maxwedge
11-27-2011, 02:36 PM
See this link. http://www.nastyz28.com/sbchevy/sblock.php

seattletri
11-27-2011, 07:48 PM
Thanks MaxWedge - I looked at the engine block suffix again and it's FA instead of PA. The NastyZ website confirmed it's a 1969 327. Thanks again.

joe68
11-30-2011, 08:10 PM
sorry guys this was reposted somehow from a long time ago!
can't explain it! but anyway motor was done and in car and running, hope to finish this winter, thanks for all the help

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