Block casting number for 68 327

[brumbach]

In reading Corvette by the Numbers, the 3914660 was used in the 68 327/300hp. Also listed is the 3914678. If accurate, what are the occasions that the 660 was used?

Thanks,

Bill

 

[Vettehead Mikey]

NCRS books show it as base engine only and unverified for time period.

Have you found one?

 

[brumbach]

NCRS books show it as base engine only and unverified for time period.

Have you found one?

Yes. Thanks

 

[GerryLP]

In reading Corvette by the Numbers, the 3914660 was used in the 68 327/300hp. Also listed is the 3914678. If accurate, what are the occasions that the 660 was used?

Thanks,

Bill

My "Chevrolet Small-Block V-8 ID Guide" says 68 - 69 327, 250 Hp, Truck.

My "Corvette Parts Interchange Manual" does not show the 4660 number as an interchange. It does, however, shows the 3914678 as the block for a 1968 327 engine.

I have a 3914678 block, but it has an RPO stamp of "YC". This is a C-10 through C-25 truck block. The advantage is that it has a taller deck and thicker walls, so that it can be bored-over beyond 0.060".

So technically, the 4660 is a 327 block, but not used on muscle or sports cars.

GerryLP:cool

 

[Vettehead Mikey]

Yes. Thanks

Cool! Does the rest of the motor ID check out, casting date, stamp pad numbers and broaching, etc.?

 

[6880 Mike]

My NCRS Pocket Guide shows the 4660 block as base engine only for a short period of time early. 4678 block after that.

I suppose the question is "What is "early"? Is this block in a '68? What's the VIN and time/build date?

Got a casting date for the 4660 block?

 

[JohnZ]

I have a 3914678 block, but it has an RPO stamp of "YC". This is a C-10 through C-25 truck block. The advantage is that it has a taller deck and thicker walls, so that it can be bored-over beyond 0.060". GerryLP:cool

No difference in deck height - all small-blocks had exactly the same deck height (9.025"), regardless of application; only the big-block was produced with two different deck heights.