My turn to ask a question

[James Rogers]

I am rebuilding a motor for a fellow here in NC and have found some interesting differences. I don't know how to seperate pictures with text so it will take a couple of posts to explain. Here are the first 2 pictures that show the area at the front of the valve chamber. The block with the painted space between the chamber and the timing side cover is the common block. The other picture is of this odd block with no recess between. This block is an Aug/Sept. 29 block and the numbers are original.

[James Rogers]

Next oddity is this symbol cast in the rear of the block and on the rear main.

[James Rogers]

It is also obvious the block had square plugs in the casting boxes when made. All I have ever seen are like the second picture with round plugs.

[James Rogers]

Last post. This one shows the serial number block which is more robust than any I have seen and never ground on or tampered with. The corners on the number block are very square and the block is thicker than any I have seen.

Any observations?

[John Stone]

I have seen the first post on 1928 engines. Usually with 5 bearing camshaft. What does the rear of the block look like where the throttle linkage bolts on? That area was different on the 1928 engines.

Other things I just didn't notice.

[Jim Parker Toronto]

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Looks like a rare find.... never saw anything like it, thanks for sharing!

[Marco Tahtaras]

I don't know my details that well on blocks and still haven't brought my junk from the old house to be able to look at it. However the third set of pics sure looks like a diamond block to me. Dealers would still restamp transplants in the mid 30's. Was it a low bore when you got it?

[Steve Plucker]

Originally Posted by John Stone

I have seen the first post on 1928 engines. Usually with 5 bearing camshaft. What does the rear of the block look like where the throttle linkage bolts on? That area was different on the 1928 engines.

Other things I just didn't notice.

John,

And here is how it went:

CYLINDER BLOCK TO SPARK AND THROTTLE CONTROL ASSEMBLY CONNECTION AREA AT BACK OF CYLINDER BLOCK: GROUND “FLAT” OR WITH TWO PROTRUDING BOSSES

FLAT # 435 NOVEMBER 07, 1927
TWO BOSSES # 495 NOVEMBER 14, 1927 (60)
(CONTINUE TO JANUARY-FEBRUARY, 1929)



CYLINDER BLOCK TO SPARK AND THROTTLE CONTROL ASSEMBLY CONNECTION AREA AT BACK OF CYLINDER BLOCK: WITH TWO PROTRUDING BOSSES OR GROUND “FLAT”

TWO BOSSES # 975,432 JANUARY 30, 1929
FLAT # 981,613 JANUARY 31, 1929 (6,181)
(CONTINUED THROUGH END OF PRODUCTION)

Pluck

[1931 flamingo]

Is it possible it's a foreign block (russian?) or were all blocks cast in the usa??
Paul in CT

[James Rogers]

Originally Posted by John Stone

I have seen the first post on 1928 engines. Usually with 5 bearing camshaft. What does the rear of the block look like where the throttle linkage bolts on? That area was different on the 1928 engines.

Other things I just didn't notice.

Late 29 block with 3 cam bearings. The pad for the throttle is oval shaped like all blocks from early 29 to end.

[James Rogers]

Originally Posted by Marco Tahtaras

I don't know my details that well on blocks and still haven't brought my junk from the old house to be able to look at it. However the third set of pics sure looks like a diamond block to me. Dealers would still restamp transplants in the mid 30's. Was it a low bore when you got it?

No diamond and the bore was .100 over. I had to bore it .125.

[James Rogers]

Originally Posted by 1931 flamingo

Is it possible it's a foreign block (russian?) or were all blocks cast in the usa??
Paul in CT

Not foreign as the numbers are stamped like any standard engine I have and are obviously original. As far as being a dealer replacement, I have never seen a block like this even, a replacement.