This heavy-duty aluminum block is 47 lbs lighter than a production rear wheel-drive cast iron block. It has extra thick cylinder walls with dry nodular iron sleeves. The head bolt bosses are reinforced to improve head gasket seealing. This block has wider main bearing bulkheads than a production cylinder case; four-bolt caps are installed on the two intermediate main bearings. These billet steel main caps have splayed outer bolts that provide additional bearing support.
The aluminum Bow Tie V6/60 Degree block features a revised lubrication system. The "priority main feed" oiling is similar to a Chevrolet small-block V8, with three oil galleries above the camshaft; production V6/60 blocks have only two oil galleries. Oil is routed directly to the main bearings in a Bow Tie block to ensure proper lubrication at high RPM. The main bearing saddles are grooved to increase the flow of oil to the crankshaft journals through additional feed holes drilled in the upper bearing inserts. Block weight is 59 lbs.
Technical notes: Aluminum Bow Tie V6/60 engine blocks have rough-bored 89mm cylinders which can be safely overbored to 91mm. Light alloy Bow Tie block have bosses for both FWD and RWD engine mounts. The start motor can be installed on either side of the block.
Main stud info for all 60 degree V6 engines. (ARP)
8 - Studs (11mm X 1.5 & 7/16" - 20) - ATP4.65L or Undercut Short studs (11mm x 1.5 & 7/16" - 20) - ATP4.650LU
8 - Hex Nuts (7/16" - 20) - APN58 or 12 point nuts (7/16" - 20) - APN12-1
8 - Washers (7/16 ID 13/16 OD) - APW1316N
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