427 Aluminum Block Numbers

[69LM1]

I am looking at buying this block, what can you guys tell from these numbers? Vette or CoPo, or either? Any help is appreciated!!!

-The casting numbers at the rear of the block are "3916321"(it has 4 bolt mains).

-The casting date is hard to make out but looks like "1 27 7".

-The stamped numbers on the front deck looks like "TI0I6TH"

-There is a partial vin on the block that reads " 18J282724"

-The crank is forged, cross-drilled and ".010/.010.

-The rods are 7/16 full floated dimple rods.

Rich

[jg95z28]

3916321 = 427 cid-425hp Passenger or 400hp, 430, 435 Vette (4-bolt)
I 27 7 = Sep. 27, 1967
18J282724 => 1 =(2nd half of body style, can only be 11 2-door sedan)
18J282724 => 8 =1968
18J282724 => J = Janesville, Wi (Passenger model)
18J282724 => Passenger model begins with 100001 so that also holds true.

Now for the ??? Are you sure its TI0I6TH? That's the only one I can't find in Colvin. I found an IH for the 390 hp 427 cid passenger model with manual (1968), but the 390 HP version was only a 2-bolt block.

[JChlupsa]

18J282724 => 1 =(2nd half of body style, can only be 11 2-door sedan) 1 = Division- in this case Chevrolet


One of the last of that block put out also since it was stopped being used in Jan of 68. All the rest checks out.

[Pantera]

How could that be a Alum block? I thought the ZL-1 blocks came out in '69?
Sounds more like a alum head L-88 motor but I was not aware that they put them in a Pass car back in 1968 according to the vin #?? That is a '68 S/N is it not?

[GMH454]

Glad you asked it. Its been puzzling me.
http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif

[jg95z28]

You guys are right. If those numbers are correct it is indeed a cast iron block. http://www.yenko.net/ubbthreads/images/graemlins/grin.gif

[JChlupsa]

John Z says its a out of a 68 Caprice from the Janesville plant

[rpoz11]

As far as Im aware of there are 3 BB aluminum casting numbers but I still am searching to see if there are any "0" code prototypes ever made. Im in conversations with my NCRS judge friend trying to eventually document these. RoadCourse and 1/4 mile guys to me are where I find these and occasional Marine shops Ive seen these at. Ill keep digging until Im exhausted on my searching... http://www.yenko.net/ubbthreads/images/graemlins/beers.gif Also, as there were a few Small Block GM aluminum castings; Is there any Board knowledge of those #'s? http://www.yenko.net/ubbthreads/images/graemlins/grin.gif

[KNAPPY]

What kind of numbers would an "o" block have?

[rpoz11]

0-123456 This would be what GM did when making Prototype pieces; This was there way of Identifying non-DOT parts manufacturing. http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[KNAPPY]

How about 0-326711

[jbsides]

Do you mean this one Knappy? (Sorry about the flash glare)

JB

[KNAPPY]

I have an aluminium block with thoses numbers. What are those numbers in the picture on?

[rpoz11]

Yes... http://www.yenko.net/ubbthreads/images/graemlins/smirk.gif

[jbsides]

Those numbers are on this piece.

JB

[jbsides]

Other side...

[jbsides]

Numbers...

[rpoz11]

Apparently, these were some of the first few Blocks made to use in the Can-Am series factory supported racing. I am still trying to depict if there are any previous casting numbers prior to these...Note the bottom Block has this same # as well. The top Block to me is the aluminum walled NON-Iron Sleeved Block, having the same oil galley head supports casted in place(bore size observed will help seperate the 4.250 Bore from the 4.440 Bore). Also notice the clearancing manufactured into the Valve covers; staggered or long arm rockers?? I am unsure as to how further document thse Blocks as there are SO few left in existence! http://www.yenko.net/ubbthreads/images/graemlins/beers.gif