As you may have read in my other post, I have just today picked up a donor motor from another forum member who dropped in a ZZ4. (A big THANK YOU to mg62) The engine was thought to be original, a 1974 L-48 bolted up to a 3 speed auto.

Here's the number's

Block ... 3970010

Intake ... 346250

Heads ... 3782461 **

** from what I could find, these were from a 62 to 67 327 :confused:

Any one out there have a good source to check these out?

Thanks

Michael

[Modified by 75Rag, 5:44 AM 6/1/2003]


[Modified by 75Rag, 5:45 AM 6/1/2003]

 

MSA-1 lists them as

block 3970010 - '69 - '79 302/350

Intake ... 346250 - '76 - '82 350 Qjet

Heads ... 3782461 ** - '61 - '70 302/327/350 - 1.94/1.5

Steve :steering:

 

You are correct.

The block is from a 74, and the heads are from 62-66 327 c.i.

Look on the engine pad on the passengers side and get the suffix code # and the engine # and we can tie it down more.

The suffix code will be something like a three letters. Example CKZ, CLC, CWT.

 

Ok...

off the engine pad, 2 numbers

V1015C2R and 171128699

now, these heads ..... is it possible to determine from the given serial # what exact hp 327 they came from and if they are "good" ? (read: valve and chamber sizes)

I also notice the pistons were marked .030 and were flat with recessed areas for the valves, that's not stock ... is it?

This entire set up seems to be in relatively good condition, no scoring, no obvious wear. I plan on using this engine for a mild build up, and would like to know what I'm starting with. Thanks again.

Michael


[Modified by 75Rag, 5:42 AM 6/1/2003]

 

This is what I know:

V1015C2R means V=FLINT 10=OCT 15=15th day

171128699 is the partial VIN number from the original car.

C2R block is a 305ci 155HP (probably from a Monte Carlo)....probably 1982, there should be a date stamp near your block casting number 3970010 to confirm this....

Heads 64-66...327......Camel hump,no accessory holes,160/62cc port volumes,62cc chamber....

Hope this helps.........

 

GAWD.....
:nonod: not likin' the sound of that ..

 

That's what I get too, but the casting number 3970010 should definitely be from a 4" bore engine... as in 302(z28) 327 and 350. So it seems to me that the stamp pad doesn't match the casting number. BTW my '73 L48 casting number (which is sitting in a tire in the garage) is 3970010, and my stamp number matches the vin number on my car, so I would tend to think that you have the correct engine (by the casting number which you can't really change) and somehow the stamp number has been altered???
sorry guess that didn't tell ya much


[Modified by BB73Chris, 12:53 AM 6/1/2003]

 

BB73CHRIS is correct to a point, I did not cross reference the block casting number 3970010 with the engine ID code V1015C2R. One source of information I have says that the block casting number 3970010 was produced from 1969-1980, which obviously doesn't line up with an '82 Monte Carlo....this means that the engine ID code has been re-stamped or that the block casting number 3970010 was actually produced beyond 1980. You need to tell me the block casting date code , located near the block casting number 3970010, so we can determine the true origin of this motor.

I believe the block casting number 3970010 may have been produced beyond 1980, because there's a lack of information available to cross reference.

Also, the engine ID code in this instance is a more reliable source. I don't think your engine ID code has been restamped. The engine ID code is removed when the block has been machined after a rebuild and most mechanics don't bother to restamp the pad. Most restamping is done to deceive, and I hardly think anyone wants to copy a 155HP Monte Carlo....

These numbers are only really important if your trying to match a motor with a car. Since this is a donor engine, the best way to find out what you have is to put the motor on a dyno and to run a compression test to see what this motor is making in torque and horsepower..........

BTW....new info I've found on your heads indicates.....intake 1.94 exhaust 1.5........

 

You need to tell me the block casting date code , located near the block casting number 3970010, so we can determine the true origin of this motor.

Another # on the opposite side of the block reads J146, does that help?

 

what's the significance of the camel hump? what is that?

would these heads be better for a build up than the stock 350 heads??

 

I had a 3970010 block that I just removed from my Corvette last year when I reinstalled the original engine.
I was told by my local Chevrolet dealer that the 3970010 was a stock. over the counter (Service Replacement) Chevrolet V-8.
I purchased it new from Chevrolet in 1972, over the counter.

 

Over the counter replacement engines used the same blocks as original engines did at that time. 461/462 heads were also used in SHP engines with 2.02/1.60 valves and with the same part numbers. As far as I know, the only way to tell the difference is to measure the valves. Keep in mind that the 1.94/1.50 heads were produced in much greater quantities.

 

When you say "opposite" do you mean passenger side???? If so, then J146, could mean OCT 14 1976.......I'm quite happy to eat my own comments about the engine ID code, but are you positive about the C2R numbering???

Vetterodder is correct about the 2.02/1.60 valves being available for performance versions of your heads....I've assumed you have the more common type.

I hope you're learning something about all these numbers :)

 

The camel hump is a slang term for these heads because of the protrusion on the front of them that looks like.....you guessed it.......a camel's hump. These are cast iron heads, also known as Fuelie heads (first used on'62 Vettes), and the small valve versions are good for street performance.

If you're wanting to race, then aftermarket alloy heads are probably better, because you can buy cheaper off the shelf for your intended end use, rather than modifying an existing set of cast iron.....at any rate, if you've got a '69, your "stock heads" could be Fuelie anyway, or at least an offshoot version.....

 

Why did you buy a new engine in '72????? Was it for your '68 or for another car????

 

Yes, passenger side.

Yes, 100% positive, C2R is there.

I'll measure these, but I think it may be the 2.02/1.60, I can't see how you could possibly get a larger valve in there. Maybe I'll post some pics?

I'd really like to learn ... but I think I'm more confused now....

Are these parts a good start for a build up? Everything "looks" fresh, no ring ridge, no obvious wear .... and are these heads worth keeping, messing with?

 

Wow, ... I'm totally confused. Glad it's not my motor!

:lol:

 

Check out http://www.nastyz28.com for Chevy engine block identification. See if that is any help.

 

crm711 .... great site, all GM product/part listings, not just blocks but cams, pistons, cranks heads. This will be extremely usefull as I tear into this thing.

BTW, anyone out there tell me, when an intake valve measurement is given (say 1.94 or 2.02) where exactly is that measurement taken? The head opening or the face of the valve?

 

don't get too confused....the most reliable number you have is 3970010, and that's a '69 to '80 block.

J146 "could" be the date code.....on my car the date code is near the block casting number on the driver's side...I have "T2" and "CONV2" on the passenger side. What I'm saying is there could be another code on the block that would line up with the engine ID code and partial VIN.

It's also possible that the C2R code is a Canadian designation???? I haven't been able to find anything concrete on that though.

In the end, all these numbers have to match for you to determine the exact history of the motor......if they don't match, then you have to make some assumptions.

BTW...nastyz28 is an excellent source of info...I used that to find the C2R code....

.....with the valve measurements, I'd suggest a new topic...I'm sure someone out there will help....

Let me know if you find anything else.....