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Jeff Jewell · 12-10-2011, 03:23 PM

A question for the engine builders out there...

I am looking at the GM Performance Parts BBC block, part # 19170538. The block is made for use with a 1 piece rear main seal crank and oil pan. I see that there are adapters to convert it for use with a 2 piece rear main seal crank. Is there a way to convert the block to use the 2 piece rear main seal crank and oil pan? Looking at the higher end bowtie blocks with 2 piece rear main seals, it looks like they use a 2 piece rear main seal main cap and some sort of aluminum adapter plate bolted to the block. I don't see any listings for the main cap or adapter plate, nor have I found anything with other manufacturers.

Any insight would be appreciated. Thanks!

Jeff Jewell

12-10-2011, 03:23 PM	#1
Jeff Jewell Member Join Date: Jun 2002 Location: Bangor, PA Posts: 182 Likes: 41 Liked 171 Times in 36 Posts	GM Performance Parts BBC Block Question A question for the engine builders out there... I am looking at the GM Performance Parts BBC block, part # 19170538. The block is made for use with a 1 piece rear main seal crank and oil pan. I see that there are adapters to convert it for use with a 2 piece rear main seal crank. Is there a way to convert the block to use the 2 piece rear main seal crank and oil pan? Looking at the higher end bowtie blocks with 2 piece rear main seals, it looks like they use a 2 piece rear main seal main cap and some sort of aluminum adapter plate bolted to the block. I don't see any listings for the main cap or adapter plate, nor have I found anything with other manufacturers. Any insight would be appreciated. Thanks! Jeff Jewell