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117X · 10-01-2015, 08:50 AM

Does anyone know why the GM performance 305 block (10243878) has 10mm bell housing and motor mount threads instead of the standard 3/8 16? Is there anything else dimensionally odd about the block? With priority main oiling and .260" thick cylinder walls, it sure seems like an improvement over your "fathers 305" block... Thanks, Patrick.

10-01-2015, 08:50 AM	#1
117X Junior Member Join Date: Apr 2014 Posts: 40 Likes: 0 Liked 1 Time in 1 Post	Gm performance 305 block Does anyone know why the GM performance 305 block (10243878) has 10mm bell housing and motor mount threads instead of the standard 3/8 16? Is there anything else dimensionally odd about the block? With priority main oiling and .260" thick cylinder walls, it sure seems like an improvement over your "fathers 305" block... Thanks, Patrick.