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Rear Main Oil Seal Conversion - Sealing The Deal

Rear Main Seal Top Adaptor Test Fit
Now the top of the adapter... 
   
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Rear Main Seal Top Adaptor Test Fit
Now the top of the adapter is test-fitted.
Rear Main Seal Bowtie Block
On a Bowtie block, only the... 
   
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Rear Main Seal Bowtie Block
On a Bowtie block, only the bottom half of the adapter is necessary. The rear main cap is a special design that eliminates the top half of the adapter (Chevrolet includes it with the block).
Rear Main Seal Traditional Two Piece Rear Main Seal
Here's the traditional two-piece... 
   
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Rear Main Seal Traditional Two Piece Rear Main Seal
Here's the traditional two-piece rear main seal design for comparison.
Rear Main Seal Block Line Honing
When converting a block to... 
   
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Rear Main Seal Block Line Honing
When converting a block to the two-piece design, the adapter should be fitted up first before line-honing the block, as seen here.
Rear Main Seal Alignment Fixture
If you are just converting... 
   
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Rear Main Seal Alignment Fixture
If you are just converting one block, you can beg an engine builder to lend you an alignment fixture. But if you will be doing this regularly, you can purchase your own from CV Products.
Automotive Specialists
www.
automotivespecialists.com
GM Performance Parts
www.goodwrench.com
CV Products
42 High Tech Blvd.
Thomasville
NC  27360
(800) 448-1223

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