Page 241 of GM Performance Parts 2006 Catalog by GM Parts Direct

Aluminum Racing Bare Block (rear) B Aluminum Racing Bare Block (front) B 239 10134371 Aluminum Racing Bare Block (350 ci main size) Improved, new-design 90 V-6 A-356 aluminum racing block with 3.980" bores (maximum bore of 4.125"). Block will accommodate 4.000" stroke and can be built in displacements ranging from 3.0L to 5.2L. Deck surface is 0.620" thick, with reinforced front and rear bulkheads. Head bolt holes are blind-tapped to eliminate coolant leaks. Four-bolt main caps are machined from 4340 chrome-moly steel. Block has an upgraded V-8-style oiling system. It uses a two-piece rear main seal. B. 10134351 Aluminum Racing Bare Block (400 ci main size) This block has the same features as block P/N 10134371 (see above), except it has 4.117" bores, a 2.65"-diameter main bearing bore and a provision for dry sump oiling. The maximum recommended bore is 4.130". Steel Four-Bolt Main Cap B Nodular Four-Bolt Splayed Cap A Two-Piece Rear Main Seal B Two-Piece Rear Main Seal A

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