serial number help

[papafarms]

Hi guys, just registered so new to this, i need help identifying a engine number, it was in my 40 buick convertible, but knew it was not a 40 series engine, so the number is 63066115, it is a straight8, any help would be appreciated thanks Bob

[papafarms]

Harry thanks for the reply about my engine, no use to me so i will be putting up for sale thanks again bob

[Ben Bruce aka First Born]

Bob, do we understand you that this 320ci engine was in a 40 series[special]? Must have been a squeeze!

Ben

[Guest 40 Buick 51c]

Bob,

What model is your 40?

[Guest DaveCorbin]

Dear Bob:

Be REAL careful here!!! There are TWO possible interpretations of the number you posted.

One is: 6 - 3,066,115 which would be a 320 engine from Jan. 1936, for a Century. This would require that your 1940 is a Century, a Roadmaster, or an 80 series Limited.

The second possibility, caused by a change in the position series identifier number that occurred in 1941 is: 6,306, 611 - 5 which is a March 1951 Super engine. That would lead to your 1940 being a Special or a Super, which was originally a 248 engine but now has a 263 engine in it. The 263 is a direct fit change.

The prior answer failed to take into account the second possible situation and you didn't say what series your car is.

Regards, Dave Corbin

[papafarms]

Hi guys, thanks for all the responses, my car is a special convertible 46C and the number listed is the proper listing with no dashes

[Ben Bruce aka First Born]

papafarms, we REALLY enjoy pictures here. Especially of 1940 convertables. Perhaps a pic of the side of the engine??

Thanks

Ben

[Guest DaveCorbin]

Dear Bob;

I put the dashes in ONLY to show how those engine numbers work and for the information of all of our Forum mambers.

Buick did stamp the numbers as a group at the factory. Your response of a Special means my second possibility is the correct one. (1951 Super 263)

Regards, Dave Corbin