Aluminum 4.3 l Chevy Vortec block WANTED Homebuilt Aircraft ...
In the pdf document below from GM, the description of the v6 90 aluminum BowTie blocks says: Technical Notes: Aluminum blocks are designed for crankshafts with 2.45quot. diameter main bearing journals. All production V6/90 engine components. can be installed in aluminum Bow Tie blocks. Block weight is 70 lbs.