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521
CLASSIC
Big Bore Gasket Kit fits all 3⁵⁄₈” cylin-
ders. Kit includes two veloprene coat-
ed gaskets and 2 base gaskets.
GB  James Fits
15-0886  15-0599
 Shovelhead
    — 
15-0877 Evo
Magnum Cylinder Small Parts Kit for installing 3⁵⁄₈” barrels 
on Shovelhead cases. Includes two (2) head gaskets, one 
each front and rear cylinder base gasket, eight (8) cylinder 
base nuts, and ten (10) head bolts with washers. 
VT No.  Item
11-0510
  Complete kit 
15-0599  Gasket set 
8618-20  Black bolt set 
8714-20  Chrome bolt set 
8600-8   Chrome base nuts 
8601-8   Black base nuts
11-0510
8601-8
8618-20
Metal Cylinder Base Gasket has a steel base 
metal which has been coated on both sides with a 
specially formulated high temperature oil resistant 
rubber compound. Silicone beading around the inner 
and outer perimeter forms a seal on both sides of 
gasket, pairs. 
(Shovelhead 3⁵⁄₈” Big Bore .020 Thick)
VT No. 15-1122 
Replica Knucklehead Cylinder Sets 
feature iron cast construction, original 
markings with black painted finish and 
are pre-fitted with cast pistons and 
Hastings rings.
VT No.  Year 
Fits  Compression
11-0506  1936-47  61”   7.5:1
11-0507 1941-47  74”  8.5:1
11-0506
11-0506
Replica Details!
Knucklehead Replacement Cylinder and Piston Kits are 
honed and pre-fitted with stock compression cast pistons and 
Hastings Rings. They are ready to run and will require break-in 
as suggested in the appropriate shop manual. Sold in pairs for 
stock stroke only. Order gasket set separately.
VT No.  Year 
Fits 
Compression
11-2600 1936-47 
61” 
7.5:1
11-2601  1941-47  
74” 
8.5:1
11-2601
3⁵₈” Shovel Cylinders
Knucklehead Replacement Cylinders Only for stock
bore, stock stroke and compression. Must be honed to 
standard size for proper fit. Sold each without piston.
VT No.  OEM 
Type  Year 
Fits
11-0495  16483-36  Front  1936-47 61” 
11-0494  16490-36  Rear  1936-47  61”
11-0499  16483-41  Front  1941-47  74” 
11-0498  16491-41  Rear  1941-47  74”
15-0886
3⁵⁄₈” Cylinders sold as a kit with 7.5:1 pistons, rings, gaskets, 
head bolts and cylinder base nuts. Also available as cylinder 
set only. Requires case boring and installation.
Stock Cylinder
VT No. 
Item 
Brand
11-0380*  Cylinder Set,  Sifton Note: Honed to size
11-0297  Cylinder Kit 
Sifton
11-0283 Piston 
Kit
11-0252 Rings 
Set
.200 Longer Cylinder
VT No. 
Item 
Brand
11-0385*  Cylinder Set,  Sifton Note: Honed to size
11-0289  Cylinder Kit 
Sifton
*Note: Order pistons separately.
11-0499
Knucklehead 
Cylinder Kit
11-0297
11-0380
15-0877