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Buick 8 Dynaflash engine in a 1940 Buick Special, will it fit?


40special
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I have a 1940 Buick Special that I want to possibly replace the engine.  I purchased a motor advertised for a 1940 Buick. It also has a rebuilt transmission connected to it.  The serial number on the motor indicates it was actually manufactured in 1939. the motor has Buick 8 dynaflash painted on it. Will the motor fit? The serial number for the engine is 43777614 and I did find a number on the transmission but I am unable to source it. It's number is 1812489.  I may just sell the car and motor separately depending on whether or not it will fit without jumping through a lot of hoops to make it work.  Thank in advance for  your feedback.

Edited by 40special (see edit history)
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The small engine was increased to 233 CI in 1935 and the others were replaced with a 320 CI engine in 1936.  Continued change in the dimensions of the small engine continued through 1953, but the big engine's basic dimensions remained until the last was installed in 1952.  The small engine was increased to 248 CI in 1937 and to 263 CI in 1950.  The 320 CI engine is physically longer than the small engine, but the small engine has the same external dimensions, regardless of displacement, leading to a popular substitution of the 263 CI engine in models dating back to 1937.  The small engine evolved from one producing 77 BHP in 1931 to 128 BHP in the configuration used in the 1951 and 1952 models equipped with Dynaflow automatic transmission.  The 320 CI began with 120 BHP and ultimately produced 170 BHP.  The performance increases were in part due to changing internal engine dimensions and compression ratios.  Carburetion, valve operations, combustion chamber design and other refinements added to the improved performance.

Straight 8 Engines (buickheritagealliance.org)

 

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It is a 1939 series 40 special engine 4 3777614.  The first digit is the series 4= 40 series

 

1939 start at 3572652

1940 start at 3786214

1939 & 1940 have different engine-transmission mounts. You need to use the 1940 mounts on your new engine. Simple to swap.

1939 & 1940 have different transmissions. Need to use your 1940

If advertised for 1940 it may already have 1940 mounts and transmission. Someone may have done a swap in the last ~80 years

1812489 will be a casting number, which usually is different from the part number.

Photo would help identity.

 

Edited by 1939_Buick (see edit history)
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10 minutes ago, 1939_Buick said:

It is a 1939 series 40 special engine 4 3777614.  The first digit is the series 4= 40 series

 

1939 start at 3572652

1940 start at 3786214

1939 & 1940 have different engine-transmission mounts. You need to use the 1940 mounts on your new engine. Simple to swap.

1939 & 1940 have different transmissions. Need to use your 1940

If advertised for 1940 it may already have 1940 mounts and transmission. Someone may have done a swap in the last ~80 years

1812489 will be a casting number, which usually is different from the part number.

Photo would help identity.

 

I'm new at posting.   I did post pics.

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Have several 1939 transmission casings with casting number 1308227- x (x varies)

Have 1 off transmission, bought as 1940, with casting number 1319416-1

 

Unsure if 1939 & 1940 bell housings are the same

A photo from the other side of transmission would help. 1939 used a cable. 1940 went to (better) solid rod for external mechanism.

 

Position of the dip stick shows as 1939. In 1940 the dip stick went behind the distributor towards the bell housing

Edited by 1939_Buick (see edit history)
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6 minutes ago, 1939_Buick said:

Have several 1939 transmission casings with casting number 1308227- x (x varies)

Have 1 off transmission, bought as 1940, with casting number 1319416-1

 

Unsure if 1939 & 1940 bell housings are the same

A photo from the other side of transmission would help. 1939 used a cable. 1940 went to (better) solid rod for external mechanism.

I'll get more pics tomorrow. The motor is off site in storage. Thank you.

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17 hours ago, 1939_Buick said:

Have several 1939 transmission casings with casting number 1308227- x (x varies)

Have 1 off transmission, bought as 1940, with casting number 1319416-1

 

Unsure if 1939 & 1940 bell housings are the same

A photo from the other side of transmission would help. 1939 used a cable. 1940 went to (better) solid rod for external mechanism.

 

Position of the dip stick shows as 1939. In 1940 the dip stick went behind the distributor towards the bell housing

Here are some pics of the other side of the transmission and a front motor mount. There were no rear mounts.  I did find another number on the transmission #1312488

IMG_20220823_110953449.jpg

IMG_20220823_111233146.jpg

IMG_20220823_111006462.jpg

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