S&S CYCLE Super Stock Engine Case for Evolution Big Twin - 3.500" Bore, Part 31-0000 Hardware Group EXP bases (two halves) for

EXP bases (two halves) for reliable operation

an outer pinion drive gear

The Saddlehyde cover provides durability and a premium feel

it provides a reliable and long-lasting solution for maintenance or upgrades

S&S CYCLE Super Stock Engine Case for Evolution Big Twin - 3.500" Bore, Part 31-0000 Hardware Group EXP bases (two halves) forEngine Case Super Stock 3. 500" Evolution Big Twin The S&S CYCLE Super Stock engine case (Part 31 0000) is designed for high performance Evolution Big Twin motorcycles with a 3. 5 inch bore. Crafted in the USA, this engine case is engineered to accommodate any stroke up to 5 inches and most stock length connecting rods, providing versatile customization for your build. The case features precision machining to accept an oil filter assembly that mounts