12480175 Block, Bow-Tie Sportsman (350 Main Size)


This iron block is fully CNC machined from the H-D 10051184 casting. It has siamesed cylinder walls, cast nodular caps, four bolts on all five main caps; the outer bolts on the three center main caps are splayed 20 degrees. Grade 8 bolts secure the caps.
It features priority main oiling and 9.025" deck height. The blocks come finished bored at 4.117" and the maximum recommended bore is 4.150".

This block features a one-piece rear main seal; "350" main size (2.45"). It features lifter bore heights (.842"), same as P/N 24502503. 

Technical Notes: It may be necessary to clearance top of lifter bores with some roller lifters. The block requires 2" O.D. cam bearings at all five locations (P/N 12370843 set). Same as P/N 12480157 except it is a one-piece rear seal design. This block includes rear seal adapter and components.
Main bearing torque specifications for all Bow-Tie blocks are 65 lbs. inner bolts, 60 lbs. outer bolts and 40 lbs. on 3/8" front bolts with light oil.