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S&S® SUPER STOCK® GENERATOR STYLE CRANKCASESFOR 1936-’69 BIG TWIN ENGINESThe S&S Super Stock generator style crankcasesare designed to appear like stock original stockcases and this gives the engine builder analternative to costly repairs when attempting to fixfatigued, broken, worn-out stock crankcases. In spiteof the stock appearance, these cases incorporateupdated design features that improve overall enginestrength and reliability.GENERATOR CASES ARE MACHINEDIN SEVERAL CONFIGURATIONS:▼ 1936-’47 knucklehead engines with tin primary.▼ 1948-’64 panhead engines with tin primary.▼ 1965-’69 panhead & generator shovelhead with alloy primary.▼ Special – alternator/generator.NOTE – engines for 1936-’64 chassis with tin primary must use 1954-’64style inner primary cover.S&S Super Stock generator style crankcases are available forstock 37⁄16” or 35⁄8” bore, but can be special ordered for bore sizesup to 313⁄16” and deck heights as much as 3⁄16” taller than stock.Pre-clearanced for strokes up to and including 5”.SPECIAL ORDERSA special order sheet must be filled out for any special order crankcases.Ask your S&S Customer Support Representative or download specialorder forms from our website at www.sscycle.com.S&S® SUPER STOCK® GENERATOR CRANKCASES FOR 1936-'69 BIG TWINCrankcase Style Stock Bore 35⁄8" Bore Special Order Notes1965-'69 Panhead or Shovelhead 31-0010 31-0013 31-0014 1, 4, 61948-'64 Panhead 31-0008 31-0009 31-0014 1, 2 ,51936-'47 Knucklehead 31-0006 31-0007 31-0014 1, 3 ,51984-'99 Big TwinAlternator/Generator31-0022 71966-'84 Big TwinAlternator/Generator Shovelhead31-0026 7NOTES:All S&S crankcases use Timken® style sprocket shaft bearings and 1958 & later pinion bearings.These cases will not accept stock 1957 & earlier flywheel assemblies.1. 1936-'69 style oil pump. 5. Machined for 1955-'64 tin primary.2. Machined for stock panhead cylinder base oil feed. 6. Machined for 1965-'69 alloy primary.3. Motor mounts are machined for stock 1936-'47 frames, adapter plate for 1948 & later style frames is included.4. Includes primary scavenge port machining. 7. Machined for 1970-up alloy primary.NOTES FOR GENERATOR STYLE CRANKCASES:▼ Stock like features - external left case ribbed construction, fits stockprimary chain covers for each respective year group - stamped steelfor 1955-’64 engines (1936-’54 must use the 1955-’64 style inner steelprimary cover) and cast aluminum for 1965-’69 engines. The manualtimer advance/relay mounting boss on 1936-’64 is retained so earlytimers can be installed.▼ Motor mounts on crankcases for knucklehead engines aremachined to fit stock 1936-‘47 frames. An adapter plate is includedso these cases may be used in 1948 and later style frames.▼ All cases are designed for late style generator (two brush type) with5⁄16” mounting bolts to eliminate early generator cradle/mountingstrap bosses for simplicity and economics.▼ All S&S generator style crankcases use more readily available ¼”-20thread fasteners to mount gearcover, oil pump, tappet guides, timer,and timer advance bracket.▼ Updated features include - Timken® sprocket shaft main bearing inall years instead of older, stock straight roller bearings. This results inbetter flywheel assembly stability, placement, and longer engine life.▼ Since all S&S generator style crankcases use 1958 and later stylemain bearings, stock flywheel assemblies 1957 and earlier can notbe used in S&S crankcases. Flywheel assemblies must have 1958 andlater pinion shaft with 1.250” diameter bearing, and a 1954 and laterstyle sprocket shaft designed for a Timken main bearing.▼ Generator style cases for 1936-’47 knucklehead engines aremachined to supply oil to the heads from a boss located near therear tappet guide or from a stock or S&S gearcover. Provision for oilscavenging from the heads in these crankcases is the same as stockwith passageways that connect the tappet guides to the crankcasebreather gear.▼ Crankcases for 1948-’69 engines are machined with a provision toseparate the oil supply to the top and bottom ends if an S&S oilpump is used. This feature lets you choose the 1972 and earlier stock"side oiling" system or the 1973 and later split oil system. The stockcast iron oil pump can be used for the “original look” and stock oilingsystem. If an S&S billet 31-6200 oil pump is used, the oiling systemcan be set up as stock or updated to a split system.▼ Panhead engines 1963-’65 with outside oil supply lines to the cylinderheads must use the oil supply port located behind the rear tappetguide or the oil fitting toward the rear of the S&S gear cover. S&Sgenerator style crankcases do not have the stock style "outside oiler"oil supply boss, so special oil supply lines will need to be fabricated.Visit us at www.sscycle.comCrankcases45