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Help! Engine Block Identification

surfgreen1957

New member
Joined
Mar 30, 2014
Messages
2
Location
So Cal
Hello,

Any help appreciated in identifying a short block that I purchased a few months ago.

Casting number - 3963512 T
Stamp Pad - T0317 1W
Cast Date - L 08 8
2 bolt main
6223 forged crank

I have not been able to identify a 1W suffix. It is clearly a 1 as opposed to an L.

Any help is appreciated.

DSC03904.jpg


David
 

Vettehead Mikey

Well-known member
Joined
Aug 26, 2003
Messages
3,486
Location
Not that far from Ottawa
Corvette
1973 Coupe
That's not a factory stamp so there's no telling what it might mean. The engine block was cast in Dec. '68. GM did not use code 1W or IW in '69 production as far as I can see.
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,457
Location
CenCoast CA
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71 04 12 19
What you have is a bastardized assembly of parts.

The crankshaft was used in all 396es during MY65 and 66. It was, also, used in 396es in A-cars and F-cars from '67-'69.

The block, in its 2-bolt main bearing form, is for a passenger car Big-Block or a low-performance Corvette Big Block. It was used from mid-MY69 to MY71 for both 427s and 454s. The same block, in four-bolt main bearing form, was used for hi-perf Big-Blocks other than L88s

A "T" on the stamp pad sometimes meant the engine was made at the Tonawanda NY engine plant and since the engine is a BBC, that makes sense as BBCs were built at Tonawanda.

As for the rest of that odd stamp pad number: being that it's a 2-bolt 427 or 454 block with a 396 crankshaft I'll guess that either: 1)It was a GM replacement 396 short block purchased between late '69 and '71 and was stamped with whatever stamping system GM used for replacement short blocks back then or 2) it was assembled by a remanufacturer or a rebuilder from parts on hand then restamped with some numbering system specific to that vendor.
:chuckle
Or, it may have been put together on a dirt floor in some hillbilly's car port with parts found at a swap meet.
 
Last edited:

Antz81

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Joined
Dec 21, 2013
Messages
936
Location
Auckland, New Zealand
Corvette
1981 4 speed
The casting number and date matches a 427 big block.
1W as a suffix mast be a mistake. but it sure does look like a 1.
is it just the block and crankshaft you have no heads?
 

surfgreen1957

New member
Joined
Mar 30, 2014
Messages
2
Location
So Cal
Thanks for the responses. No heads with the short block I purchased. It did it have domed Arias pistons that I had machined down to run pump fuel. The plan for my 67 Chevelle is to install a Factory Muscle stick from Comp Cams w/ solid lifters, M21 w/ 3.55 posi.

Thanks for the responses.

DSC04301.jpgArias domed pistons.jpg
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,457
Location
CenCoast CA
Corvette
71 04 12 19
With two bolt mains, you're not going to have the reliability to run a high enough rpm to need a mechanical lifter camshaft.

Your better to run a roller hydraulic lifter cam. The engine will make a lot more power and torque in the RPM band the engine will be safe to run in.
 

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