Join Date: Jul 2006
Location: Northfield, Illinois
Did we do this before? The top of early DCOE's is a different shape than the top of later DCOE's.
Originally there were drilled passages to create a vacuum and eliminate non existent air leaks at the ball bearings. This was because the prototype DCOE's had bushings where the shaft end ball bearings later appeared. The result was that very few production DCOE's had functional drill passages, but still, until moulds were replaced, they used the large top configuration. In the mid-late '60's the moulds were replaced, and all DCOE production became small-top variants.
Below is a SMALL top gasket on a LARGE top top. The pen points to areas of the large top different from the small top version. The final photo shows the passages cast into a large top body, covered by this top, but NOT a small top.
Still confused? Send me an e-mail and I'll send lots of comparative photos.
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