Were the original aluminum 377 CUI Grand sport engines from 1963 sleeved? What was the casting number on GS engines?

ZERO (0) I thought was experimental for Chevrolet.

Yes, the casting numbers starting with 0 are either prototype or experimental parts. I don’t know if the 377 blocks were sleeveless or not. This block could have originally been sleeveless and had the sleeves added. No real way to know for sure.


Thanks for all the replies,


Jason

This block looks similar and has casting number 0 395946. Does anyone know if the 0- casting numbers were assigned in numerical order? I’m curious if I could narrow down the time this was made based on the casting dates of other experimental parts in relation to the number after the 0-. For example, was this block with the 0 395946 designed after mine with the number 0 359198?

https://hotrodenginetech.com/1969-z28-canted-valve-302/



Jason

0 240983 is the Grandsport engine casting number - however the description sounds the same, notched cylinder block to accommodate a 3.75" stroke, 4 bolt mains, thicker webs and pressed in Steel liners.

'

The Numerical thing makes sense until proven otherwise.
O-172978 is the 63? Alcoa Casting Cerv. Block in the 'Vair link.
Anything on the Bore/Stroke of your engine yet Jason?
:beers:
~ Pete

.

Nothing on the bore and stroke yet. It has been raining here and I have to pull a car out to get to the engine. Possibly tomorrow.

Thanks,

Jason

I found the thread with the 67 Z that Charley put the aluminum block in. It can be found here:

https://www.yenko.net/forum/showthre...imental&page=9


Jason

Here are some other 0- casting numbers with their associated date codes:

0313436 5/27/68 Big Block Chevy Heads

0-319183 12/5/68 Big Block Chevy tall deck intake

0-334112 11/17/67 Big Block Heads

0-310512 12/8/67 Crossram Intake Top

0-272117 12/9/65 Small Block Chevy Intake

0-314634 12-2-68 302 Hemi Head Valve Cover

^ hah. Nice!

OK, I was able to get to the engine and take some measurements. It was hard to be sure accurate since the tangs on my caliper were not long enough to reach into my side of the cylinder and I could only measure the stroke with a machinist ruler.

The best measurements I could get were 3.75 inches for the bore and 2 3/8 for the stroke. That looks to come out to 206ish cubic inches.

RobR,

You were right on with your theory.


Thanks,

Jason