I have an engine that the guy told me was a 427. Any way to tell what it came from?
Block casting number 3855961
Date by pass side freeze plug hard to read looks like A 14 6
Numbers on front of pad TOII9IVR
6R16 6 427
Head casting number 3917215
Head dates G 5 7 & H 16 7

Any Ideas ??

Try MORTEC.com for casting #'s and dates.

3917215....67-68...oval..CLOSED..396, 427, 101cc chamber

3855961....396.......65-66...2 or 4 bolt
3855961....427.......66......2-bolt

Look her to decode the #'s on the front pad of the engine.
http://www.nastyz28.com/chevy-engine-code-stampings.php

IVR - 396-325 hp 1965-68 Impala engine with Rochester Carb (R stand for that)

This is a 66
6R16 6 427 is the con vin
6 - 1966
R - Arlington Assembly
166427 - Last 6 of the VIN


The block was cast Jan 14, 1966
the engine was assembly on Jan 19, 1966

The heads are not original

Its not a 427..............

I found this info in "Chevrolet by the Numbers" 1965-69 It's a great book for info!!!


T=Tonawanda Plant

01=January
19=19th day
IVR=396ci 325hp Turbohydramatic, Rochester Carb

A 14 6= January 14th 1966 block casting

6R166427= "I Believe to Mean" VIN info

6=1966
R=Arlington, Texas Plant
166427=Sequence Number of of model

My belief is that this is a 396 not a 427.
Good luck to you.

[quote=elcamino;1772301]IVR - 396-325 hp 1965-68 Impala engine with Rochester Carb (R stand for that)

This is a 66
6R16 6 427 is the con vin
6 - 1966
R - Arlington Assembly
166427 - Last 6 of the VIN


The block was cast Jan 14, 1966
the engine was assembly on Jan 19, 1966

The heads are not original

Its not a 427..............[/q

elcamino... Great info.. What does con vin mean?
Also the 6R16 was not in line with The TOII9IVR it was underneath it a little bit and the 6 427 was under that, if that makes sense

Could you post a picture of the engine pad? The Arlington, TX asseembly plant didn't gangstamp their vins on the engine pad in 66 or 65/4. Each character was stamped separately so some of the characters on your vin might not be level like the T0119IVR is.

Nice block though.

What does con vin mean?

Confidential Vehicle Identification Number

Its a derivative of the VIN that includes the model year, assembly plant and last 6 digits of the serial number that the engine was factory installed in and it was used for id'ing stolen parts/cars etc. For instance, if the car this engine came from was reported stolen and you were found in possession of the engine, you were in big trouble as this was enough to convict of possession of stolen parts.

Its stamped on the engine, trans, body and frame at the final assembly plant per federal regulations. Was optional till 1968 when it became mandatory for all car makers. In 1968 the also added a maf. id prefix to it, e.g. 1 for Chevrolet, 2 for Pontiac and so on.

Could you post a picture of the engine pad? The Arlington, TX asseembly plant didn't gangstamp their vins on the engine pad in 66 or 65/4. Each character was stamped separately so some of the characters on your vin might not be level like the T0119IVR is.

Nice block though.

That would explain why the charcters are not in line. It looks like three seperate stampings.
I have a picture, but I don't know how to post it

Could you email it to em at Tranenut@juno.com
It would be great for my impala research.
Warren

Hello, long time no post. I have some experience with this and you may have a 427.
I have a 3855961 casting, also an IVR.
I bought my '70 and was told it was a NOM 396. It coded as a '66 passenger car engine, nothing special. But it sure revved quickly.
I developed a bent pushrod, so I had a good excuse for a full rebuild. Turns out that it has a 4.25" bore, so it really was a 427. After I did some research (mostly searching old posts on here) I learned that this casting can safely be bored out that much, since GM used that casting for 396's and 427's.
So the guy may be right, it may have been bored out. Of course, he could be wrong/mistaken and it is not.

Danny

NASCAR allowed Chevy to use the 427 in 1965 to run with the 426 Hemi and 427 Ford.
It is interesting that the 1965 396 block can take the overbore to 427 cu in.

I wonder if this was done to run the engine in NASCAR or was it just a design coincidence that the block was thick enough to take the larger bore.

That would explain why the charcters are not in line. It looks like three seperate stampings.
I have a picture, but I don't know how to post it

Set up a free account here: http://photobucket.com
Add pictures to that account
Then copy/paste link into reply box

Atantaboy, could you post the full engine pad numbers off your IVR block? I would like to add the info to the impala database.

Warren

Hello,
I apologize for taking so long to reply.
The pad numbers are TOII2IVR (though the II could be 11, it looks more like II)
below that and to the right is 6L 160883
The bore is 4.25", and I took pictures with a tape measure across the cylinder when it was apart.
The casting number on the back is difficult to read but it is something like:
3656961, though only the 5 and 961 are definite.
Hope that helps, please let me know if you need anything else.

The I and the 1 meant the same thing to the engine plants and were used interchangeable to mean the number 1 (one).

Back in those days, illiteracy was very common among workers on the assembly lines.