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 90-1498
S&S CYCLE
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95S&S Cycle's cylinder head kit delivers the flow characteristics and durability demanded by serious Big Twin builders. Whether you're increasing displacement, optimizing combustion chamber design, or restoring a complete top end, these fully assembled...09300009- SKU:
- 09300009
- Availability:
- Ships Same Business Day
- Weight:
- 25.35 LBS
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.500'
- FEATURES:
- SINGLE SPARK PLUG
- PRODUCT NAME:
- CYLINDER HEAD KIT
- STYLE:
- STOCK COMPRESSION
- UNITS:
- KIT
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95 -
FEULING OIL PUMP CORP. Cylinder Head Breathers - M8 3250
FEULING OIL PUMP CORP.
$399.95Stock cylinder head breathers limit your engine's breathing efficiency and can trap moisture that compromises oil quality. Feuling's billet breather design optimizes crankcase ventilation while superior sealing prevents oil carryover and system leaks. If...09300239- SKU:
- 09300239
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
$399.95 -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.003"/0.005"/0.010" - M8 1230
FEULING OIL PUMP CORP.
$79.95Excessive rocker arm end play causes noise, oil starvation, and accelerated wear on your cylinder head—issues that compound quickly on high-performance engines. These hardened steel shims restore proper clearance, allowing you to dial in the ideal 0...09300240- SKU:
- 09300240
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
On Sale
S&S CYCLE Billet Head Breather Kit - Anodized Blue - M8 900-1186
S&S CYCLE
MSRP: $299.95Now: $269.96Was: $299.95If you're running an M8 Harley and tired of excessive oil blow-by fouling your intake and burning off in the combustion chamber, upgrading to a quality billet breather kit isn't optional—it's maintenance. The S&S CYCLE Billet Head Breather Kit replaces...09300243- SKU:
- 09300243
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $299.95Now: $269.96Was: $299.95Qty in Cart: 0Quantity:Price:MSRP: $299.95Now: $269.96Was: $299.95Subtotal: -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.003" - M8 1227
FEULING OIL PUMP CORP.
$119.95Excessive rocker arm end play doesn't just create noise—it degrades oil pressure distribution and accelerates wear on your cylinder head's thrust surfaces. Feuling's hardened rocker shaft shims restore the critical 0.0035"-0.005" clearance window that...09300246- SKU:
- 09300246
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$119.95 -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.010" - M8 1229
FEULING OIL PUMP CORP.
$99.95Excessive rocker arm end play doesn't just create noise—it degrades oil pressure consistency and accelerates wear on your cylinder head's thrust surfaces. The Feuling 0.010" M8 Rocker Shaft Shim solves this by precisely controlling side clearance to...09300248- SKU:
- 09300248
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$99.95 -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.005" - M8 1228
FEULING OIL PUMP CORP.
$99.95Excessive rocker arm end play causes valve train noise, oil starvation, and accelerated wear on your cylinder head—especially on M8 heads prone to standoff damage. These hardened shims restore precise clearance to Feuling's recommended 0.0035"–0.005"...09300247- SKU:
- 09300247
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$99.95 -
KIBBLEWHITE Exhaust Spigot - Big Twin 20-2104
KIBBLEWHITE
$11.35If your classic Panhead's exhaust attachment point has cracked, corroded, or simply worn out, you need a reliable replacement—not a band-aid fix. The KIBBLEWHITE Exhaust Spigot rebuilds this critical junction with precision-machined 6061 T-6 aluminum,...09300059- SKU:
- 09300059
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- 6061 T6 ALUMINUM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- EXHAUST SPIGOT
- UNITS:
- EACH
$11.35 -
FEULING OIL PUMP CORP. Valve Spring Shims 1218
FEULING OIL PUMP CORP.
$18.95Valve spring shims are critical for dialing in your valvetrain geometry—mismatched spring heights directly compromise lift accuracy, stability, and engine reliability. Getting the open height spec right to peak camshaft lift prevents premature wear,...09300155- SKU:
- 09300155
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
$18.95 -
FEULING OIL PUMP CORP. Valve Sprint Shims 1217
FEULING OIL PUMP CORP.
$14.95Proper valve spring seat height is critical to maintaining valvetrain stability and extracting maximum performance from your camshaft. If your springs aren't set to the correct open height, you risk valve float, reduced lift, and potential engine damage...09300237- SKU:
- 09300237
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
- PRODUCT NAME:
- SHIM
$14.95 -
EASTERN MOTORCYCLE PARTS Mount Studs A-16864-48
EASTERN MOTORCYCLE PARTS
$14.80Reliable mounting starts with quality hardware. These Eastern Motorcycle Parts mount studs provide the secure, vibration-resistant foundation your motorcycle needs for consistent performance and longevity. Whether you're assembling a custom build or...09300110- SKU:
- 09300110
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- STUD SET
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
- TYPE:
- TOP MOTOR MOUNT
$14.80 -
On Sale
S&S CYCLE Cylinder Heads 106-4277
S&S CYCLE
MSRP: $2,149.95Now: $1,934.96Was: $2,149.95S&S Cycle cylinder heads deliver measurable flow improvements that enhance performance immediately while laying the foundation for future engine modifications. Whether you're running a stock 88" big twin or pushing displacement north of 103", these fully...09300062- SKU:
- 09300062
- Availability:
- Ships Same Business Day
- Weight:
- 28.65 LBS
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- SILVER
- UNITS:
- PAIR
- DISPLACEMENT:
- 79 CC
MSRP: $2,149.95Now: $1,934.96Was: $2,149.95 -
On Sale
S&S CYCLE Cylinder Heads - Twin Cam 106-3227
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95S&S Cycle cylinder heads deliver measurable high-port flow gains that unlock performance now while preserving headroom for future upgrades. Whether you're running a stock 88-cubic-inch or pushing a built 110-inch motor, these fully assembled heads match...09300063- SKU:
- 09300063
- Availability:
- Ships Same Business Day
- Weight:
- 28.50 LBS
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 79 CC
- COLOR/FINISH:
- SILVER
- UNITS:
- PAIR
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Cylinder Heads - Twin Cam 106-3233
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95If you're building a Twin Cam engine that demands reliable airflow and the flexibility to upgrade later, S&S Cycle cylinder heads deliver the port flow you need without forcing a complete rebuild down the road. These fully assembled heads accept OEM...09300064- SKU:
- 09300064
- Availability:
- Ships Same Business Day
- Weight:
- 28.65 LBS
- COLOR/FINISH:
- WRINKLE BLACK
- DISPLACEMENT:
- 79 CC
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- PRODUCT NAME:
- CYLINDER HEAD KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Cylinder Heads - Twin Cam 106-3240
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95If you're building a Twin Cam engine that demands serious port flow without sacrificing reliability, S&S Cycle cylinder heads deliver the airflow foundation every upgrade depends on. These fully assembled heads are precision-engineered to handle...09300066- SKU:
- 09300066
- Availability:
- Ships Same Business Day
- Weight:
- 28.50 LBS
- COLOR/FINISH:
- WRINKLE BLACK
- DISPLACEMENT:
- 89 CC
- UNITS:
- PAIR
- PRODUCT NAME:
- CYLINDER HEAD KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Headbolt Kit 93-3070
S&S CYCLE
MSRP: $149.95Now: $134.96Was: $149.95Proper head bolt specifications are critical for cylinder head clamping force, sealing integrity, and long-term reliability on high-performance engines. The S&S CYCLE 93-3070 kit delivers the precision fitment and quality materials needed for S&S Twin...09300023- SKU:
- 09300023
- Availability:
- Ships Same Business Day
- Weight:
- 1.64 LBS
MSRP: $149.95Now: $134.96Was: $149.95 -
On Sale
S&S CYCLE Cylinder Heads - Twin Cam 90-1293
S&S CYCLE
MSRP: $1,815.95Now: $1,634.36Was: $1,815.95The S&S CYCLE Cylinder Heads (90-1293) deliver measurable port flow improvements that unlock performance gains now while preserving headroom for future upgrades—whether you're running stock displacement or pushing into big-inch territory. These fully...09300058- SKU:
- 09300058
- Availability:
- Ships Same Business Day
- Weight:
- 28.71 LBS
- COLOR/FINISH:
- WRINKLE BLACK
- DISPLACEMENT:
- 79 CC
- PRODUCT NAME:
- CYLINDER HEAD KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
MSRP: $1,815.95Now: $1,634.36Was: $1,815.95 -
On Sale
S&S CYCLE Cylinder Head Kit - Big Twin 90-1004
S&S CYCLE
MSRP: $1,949.95Now: $1,754.96Was: $1,949.95Upgrading to S&S CYCLE cylinder heads transforms your Big Twin engine's breathing efficiency and power delivery, unlocking measurable gains across the RPM range. These fully assembled heads feature premium stainless steel valves and high-lift springs...09300007- SKU:
- 09300007
- Availability:
- Ships Same Business Day
- Weight:
- 24.56 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ALUMINUM
- UNITS:
- PAIR
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
MSRP: $1,949.95Now: $1,754.96Was: $1,949.95 -
On Sale
S&S CYCLE Cylinder Head Kit - Big Twin 90-1504
S&S CYCLE
MSRP: $1,799.95Now: $1,619.96Was: $1,799.95S&S Cycle cylinder heads are engineered to unlock significant performance gains on Big Twin Harley-Davidson engines through improved airflow, combustion efficiency, and valve lift capabilities. Whether you're building a street performance engine or...09300008- SKU:
- 09300008
- Availability:
- Ships Same Business Day
- Weight:
- 24.75 LBS
- MATERIAL:
- ALUMINUM
- MATERIAL:
- STAINLESS STEEL
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
MSRP: $1,799.95Now: $1,619.96Was: $1,799.95 -
On Sale
S&S CYCLE Cylinder Head Kit - Big Twin 90-1491
S&S CYCLE
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95A high-performance cylinder head kit engineered to unlock genuine horsepower and torque gains on Big Twin engines without requiring a complete rebuild. S&S Cycle's fully assembled heads eliminate the guesswork and potential fitment issues of sourcing...09300013- SKU:
- 09300013
- Availability:
- Ships Same Business Day
- Weight:
- 24.85 LBS
- FEATURES:
- DUAL SPARK PLUG
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- UNITS:
- KIT
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.625'
- STYLE:
- HIGH COMPRESSION
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Qty in Cart: 0Quantity:Price:MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Subtotal:
