Harley Engine Heads and Parts
Harley Bike Heads & Parts at JJ Motorsports
Unlock massive airflow and power with premium S&S cylinder heads and complete kits from JJ Motorsports, precision-machined for high-compression, big-bore builds on Twin Cam, Milwaukee-Eight, and Big Twin engines. These performance heads deliver dyno-proven gains with bolt-on convenience.
Shop S&S Cycle heads for championship-winning flow and reliability. Explore related categories such as Harley engine for valves and cams, or Harley for exhaust and pistons to complete your top-end build.
Top Harley Cylinder Heads & Kits
- S&S Cycle Cylinder Heads 106-4277 – Super Stock heads for M8; 2.120"/1.610" valves with high-flow ports for 114–131ci builds.
- S&S Cycle Cylinder Heads Twin Cam 106-3240 – Performance heads for 2006–2017 Twin Cam; massive flow for 124–131ci strokers.
- S&S Cycle Cylinder Head Kit Big Twin 90-1491 – Complete head kit with valves and springs; bolt-on power for Evo and Twin Cam 88–103 engines.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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On Sale
S&S CYCLE Cylinder Head Kit - Big Twin 90-1496
S&S CYCLE
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95A cylinder head is where combustion happens—and where performance is made or lost. The S&S Cycle Big Twin 90-1496 kit delivers a completely assembled, flow-optimized solution that eliminates the...09300015- SKU:
- 09300015
- Availability:
- Ships Same Business Day
- Weight:
- 25.56 LBS
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- STYLE:
- STOCK COMPRESSION
- BORE SIZE IMPERIAL:
- 3.4375'
- COLOR/FINISH:
- ALUMINUM
- FEATURES:
- SINGLE SPARK PLUG
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95 -
On Sale
S&S CYCLE Performance Replacement Head 106-6059
S&S CYCLE
MSRP: $1,468.95Now: $1,322.06Was: $1,468.95If you're running a smaller displacement engine and looking to unlock real performance gains without sacrificing reliability, the S&S CYCLE Performance Replacement Head 106-6059 delivers measurable...09300154- SKU:
- 09300154
- Availability:
- Ships Same Business Day
- Weight:
- 24.60 LBS
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- DISPLACEMENT:
- 76 CC
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- CYLINDER HEAD KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
MSRP: $1,468.95Now: $1,322.06Was: $1,468.95 -
On Sale
S&S CYCLE Cylinder Head Kit 90-1499
S&S CYCLE
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95A quality cylinder head is the foundation of engine performance—it controls airflow, combustion efficiency, and overall power delivery. The S&S Cycle 90-1499 arrives completely assembled and tested,...09300134- SKU:
- 09300134
- Availability:
- Ships Same Business Day
- Weight:
- 24.01 LBS
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- STYLE:
- STOCK COMPRESSION
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- CAST
- COLOR/FINISH:
- ALUMINUM
- FEATURES:
- SINGLE SPARK PLUG
- MATERIAL:
- IRON
- UNITS:
- KIT
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95 -
On Sale
S&S CYCLE Exhaust Stud Flange 50-0493
S&S CYCLE
MSRP: $8.95Now: $8.06Was: $8.95If you're rebuilding a classic or modern Harley engine, a quality exhaust stud flange is critical for a leak-free seal and reliable performance. The S&S Cycle 50-0493 delivers the precision fit and...09300136- SKU:
- 09300136
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $8.95Now: $8.06Was: $8.95 -
On Sale
S&S CYCLE Replacement Silicone Solenoid Caps 55-1009
S&S CYCLE
MSRP: $9.95Now: $8.96Was: $9.95S&S Cycle solenoid caps are subject to heat, vibration, and environmental stress during operation—and a compromised cap can lead to electrical failures or performance inconsistencies in your...09300137- SKU:
- 09300137
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- COLOR/FINISH:
- WHITE
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- CAP
- TYPE:
- COMPRESSION RELEASE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $9.95Now: $8.96Was: $9.95 -
On Sale
S&S CYCLE Valve Spring Shim 90-2087
S&S CYCLE
MSRP: $7.95Now: $7.16Was: $7.95Valve spring shims are critical for maintaining proper valve train geometry and preload in high-performance engines. This S&S Cycle shim ensures accurate spring pressure across the RPM band,...09300138- SKU:
- 09300138
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- COLOR/FINISH:
- BLACK
- TYPE:
- VALVE SPRING
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $7.95Now: $7.16Was: $7.95 -
On Sale
S&S CYCLE Cylinder Heads - Black 900-0251
S&S CYCLE
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95The S&S CYCLE 900-0251 cylinder heads deliver the port flow efficiency needed to maximize performance gains both now and through future upgrades. Whether you're running a stock big-twin or planning...09300139- SKU:
- 09300139
- Availability:
- Ships Same Business Day
- Weight:
- 29.30 LBS
- COLOR/FINISH:
- BLACK
- DISPLACEMENT:
- 79 CC
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
- COLOR/FINISH:
- WRINKLE BLACK
- PRODUCT NAME:
- CYLINDER HEAD KIT
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95 -
On Sale
S&S CYCLE Performance Replacement Head 106-6064
S&S CYCLE
MSRP: $1,553.95Now: $1,398.56Was: $1,553.95If you're running a smaller displacement engine and leaving performance on the table, the S&S Cycle Performance Replacement Head 106-6064 delivers measurable gains in flow and compression without...09300141- SKU:
- 09300141
- Availability:
- Ships Same Business Day
- Weight:
- 25.21 LBS
- DISPLACEMENT:
- 76 CC
- UNITS:
- PAIR
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CYLINDER HEAD KIT
MSRP: $1,553.95Now: $1,398.56Was: $1,553.95 -
On Sale
S&S CYCLE Valve Guide - +.001" 90-2211
S&S CYCLE
MSRP: $69.95Now: $62.96Was: $69.95Precision valve guides are fundamental to cylinder head integrity and engine longevity—especially in high-performance or frequently rebuilt applications. This S&S Cycle casting maintains critical...09262894- SKU:
- 09262894
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- OVERBORE IMPERIAL:
- OVERSIZE (+0.001')
MSRP: $69.95Now: $62.96Was: $69.95 -
On Sale
S&S CYCLE Valve Guide - +.002" 90-2212
S&S CYCLE
MSRP: $95.95Now: $86.36Was: $95.95Maintaining proper valve guide clearance is critical for engine longevity and consistent performance—oversized guides ensure your cylinder head can handle precision boring and honing without material...09262921- SKU:
- 09262921
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- OVERBORE IMPERIAL:
- OVERSIZE (+0.002')
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
MSRP: $95.95Now: $86.36Was: $95.95 -
On Sale
S&S CYCLE Compression Release Kit 90-4915
S&S CYCLE
MSRP: $448.95Now: $404.06Was: $448.95Cold-starting air-cooled engines is easier and more reliable with a compression release that reduces kickback and strain on your starter system. The S&S Cycle 90-4915 gives you instant control over...20099080- SKU:
- 20099080
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- PRODUCT NAME:
- COMPRESSION RELEASE KIT
- RIDING STYLE:
- STREET
- TYPE:
- ELECTRIC
- UNITS:
- KIT
MSRP: $448.95Now: $404.06Was: $448.95 -
On Sale
S&S CYCLE Compression Release Hole Plug 90-4916
S&S CYCLE
MSRP: $24.95Now: $22.46Was: $24.95If you're running a high-performance or aftermarket cylinder head, a proper compression release hole plug is essential to maintain cylinder integrity and prevent air leaks that kill efficiency. The...20099082- SKU:
- 20099082
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- STREET
- TYPE:
- COMPRESSION RELEASE
- UNITS:
- EACH
MSRP: $24.95Now: $22.46Was: $24.95 -
On Sale
S&S CYCLE Cylinder Heads 900-0349
S&S CYCLE
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95S&S Cycle cylinder heads deliver measurable flow improvements that unlock performance gains whether you're running stock displacement or building toward future upgrades. The fully assembled design...09031292- SKU:
- 09031292
- Availability:
- Ships Same Business Day
- Weight:
- 30.20 LBS
- COLOR/FINISH:
- POWDER-COATED
- COLOR/FINISH:
- WRINKLE BLACK
- DISPLACEMENT:
- 91 CC
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95 -
On Sale
S&S CYCLE Cylinder Heads - Twin Cam 106-4270
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95If you're looking to unlock real performance gains from your Twin Cam engine, port flow is everything—and S&S Cycle cylinder heads deliver the flow characteristics that support both immediate power...09300068- SKU:
- 09300068
- Availability:
- Ships Same Business Day
- Weight:
- 27.95 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- DISPLACEMENT:
- 89 CC
- COLOR/FINISH:
- SILVER
- UNITS:
- PAIR
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Qty in Cart: 0Quantity:Price:MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Subtotal: -
On Sale
S&S CYCLE Retro Top End Conversion Kit 106-1070
S&S CYCLE
MSRP: $3,995.95Now: $3,596.36Was: $3,995.95If you're running a Shovelhead and want the distinctive aesthetic of a classic Panhead without a complete engine overhaul, the S&S CYCLE Retro Top End Conversion Kit delivers authentic looks with...09300089- SKU:
- 09300089
- Availability:
- Ships Same Business Day
- Weight:
- 41.00 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER
- BORE SIZE IMPERIAL:
- STOCK BORE CYLINDER
- PRODUCT NAME:
- CONVERSION KIT
- UNITS:
- KIT
MSRP: $3,995.95Now: $3,596.36Was: $3,995.95Qty in Cart: 0Quantity:Price:MSRP: $3,995.95Now: $3,596.36Was: $3,995.95Subtotal: -
On Sale
S&S CYCLE Electrical Compression Release Unit 90-4914
S&S CYCLE
MSRP: $193.95Now: $174.56Was: $193.95Starting a high-displacement or forced-induction engine shouldn't feel like wrestling a compression spring. The S&S CYCLE Electrical Compression Release Unit eliminates the grueling hand-crank...09300135- SKU:
- 09300135
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- UNITS:
- KIT
- TYPE:
- ELECTRIC
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- COMPRESSION RELEASE ASSEMBLY
MSRP: $193.95Now: $174.56Was: $193.95 -
On Sale
S&S CYCLE Retro Top End Conversion Kit 106-1071
S&S CYCLE
MSRP: $4,499.95Now: $4,049.96Was: $4,499.95If you're running a Shovelhead and want that classic Panhead aesthetic without sacrificing modern reliability, the S&S Cycle Retro Top End Conversion Kit delivers authentic vintage looks backed by...09300090- SKU:
- 09300090
- Availability:
- Ships Same Business Day
- Weight:
- 40.87 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.625'
- PRODUCT NAME:
- CONVERSION KIT
MSRP: $4,499.95Now: $4,049.96Was: $4,499.95 -
On Sale
S&S CYCLE Performance Replacement Head 106-3466
S&S CYCLE
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95The S&S Cycle Performance Replacement Head (106-3466) delivers measurable gains in airflow and compression without sacrificing the reliability you need for sustained high-RPM operation. Built for...09300060- SKU:
- 09300060
- Availability:
- Ships Same Business Day
- Weight:
- 24.00 LBS
- COLOR/FINISH:
- POWDER-COATED
- COLOR/FINISH:
- SILVER
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- DISPLACEMENT:
- 82 CC
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95 -
On Sale
S&S CYCLE Performance Replacement Head 106-4570
S&S CYCLE
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95If you're running a smaller-displacement engine and leaving performance on the table with stock heads, the S&S CYCLE 106-4570 delivers measurable gains in flow and compression without sacrificing the...09300061- SKU:
- 09300061
- Availability:
- Ships Same Business Day
- Weight:
- 24.25 LBS
- PRODUCT NAME:
- CYLINDER HEAD KIT
- DISPLACEMENT:
- 82 CC
- MATERIAL:
- STAINLESS STEEL
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95 -
On Sale
S&S CYCLE Replacement Silicone Solenoid Caps 50-1080
S&S CYCLE
MSRP: $12.95Now: $11.66Was: $12.95S&S electronic and manual compression release kits rely on precision-engineered solenoid caps to maintain reliable ignition timing and engine performance. Over time, silicone caps degrade from heat...09300041- SKU:
- 09300041
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- WHITE
- PRODUCT NAME:
- CAP
- MATERIAL:
- SILICONE
- TYPE:
- COMPRESSION RELEASE
- UNITS:
- PAIR
MSRP: $12.95Now: $11.66Was: $12.95
