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TRASK-Tornado Turbo Kit / '17-'23 M8 Motors-Turbo Kit-MetalCore Harley SupplyTRASK-Tornado Turbo Kit / '17-'23 M8 Motors-Turbo Kit-MetalCore Harley Supply
TRASK
Tornado Turbo Kit / '17-'23 M8 Motors Sale price$5,999.95 USD
On saleS&S CYCLES-129" Power Package Engine Performance Kits / '17-'23 107" M8 Oil Cooled Motors-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-129" Power Package Engine Performance Kits / '17-'23 107" M8 Oil Cooled Motors-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
129" Power Package Engine Performance Kits / '17-'23 107" M8 Oil Cooled Motors Sale priceFrom $3,023.95 USD Regular price$3,359.95 USD
On saleS&S CYCLES-132" Power Package Engine Performance Kits / '17-'23 114"-117" M8 Motors-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-132" Power Package Engine Performance Kits / '17-'23 114"-117" M8 Motors-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
132" Power Package Engine Performance Kits / '17-'23 114"-117" M8 Motors Sale priceFrom $3,023.95 USD Regular price$3,359.95 USD
On saleS&S CYCLES-124" Power Package Engine Performance Kits / '17-'23 107" M8 Motors-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-124" Power Package Engine Performance Kits / '17-'23 107" M8 Motors-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
124" Power Package Engine Performance Kits / '17-'23 107" M8 Motors Sale priceFrom $2,939.35 USD Regular price$3,265.95 USD
On saleS&S CYCLES-128" Power Package Engine Performance Kits / '17-'23 114"-117" M8 Motors-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-128" Power Package Engine Performance Kits / '17-'23 114"-117" M8 Motors-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
128" Power Package Engine Performance Kits / '17-'23 114"-117" M8 Motors Sale priceFrom $2,939.35 USD Regular price$3,265.95 USD
REVOLUTION PERFORMANCE-143" | 139" Monster Big Bore Kits / M8 Motors-Big Bore Kit-MetalCore Harley SupplyREVOLUTION PERFORMANCE-143" | 139" Monster Big Bore Kits / M8 Motors-Big Bore Kit-MetalCore Harley Supply
REVOLUTION PERFORMANCE
143" | 139" Monster Big Bore Kits / M8 Motors Sale price$1,899.95 USD
FEULING-Race Series® "Twin Cooled Full Travel" Camchest Kits / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
Race Series "Twin Cooled Full Travel" Camchest Kits / M8 Motors Sale priceFrom $1,895.95 USD
FEULING-Race Series® "Twin Cooled Short Travel" Camchest Kits / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
Race Series "Twin Cooled Short Travel" Camchest Kits / M8 Motors Sale priceFrom $1,895.95 USD
FEULING-Race Series® "Oil Cooled Short Travel" Camchest Kits / M8 Motors-Camchest Kits-MetalCore Harley SupplyFEULING-Race Series® "Oil Cooled Short Travel" Camchest Kits / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
Race Series "Oil Cooled Short Travel" Camchest Kits / M8 Motors Sale priceFrom $1,895.95 USD
FEULING-Race Series® "Oil Cooled Full Travel" Camchest Kits / M8 Motors-Camchest Kits-MetalCore Harley SupplyFEULING-Race Series® "Oil Cooled Full Travel" Camchest Kits / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
Race Series "Oil Cooled Full Travel" Camchest Kits / M8 Motors Sale priceFrom $1,895.95 USD
FEULING-HP+ Camchest Kits / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
HP+ Camchest Kits / M8 Motors Sale price$1,695.95 USD
On saleS&S CYCLES-106" Stroker Flywheel Kits / '99-'16 Twin Cam-Flywheels-MetalCore Harley SupplyS&S CYCLES-106" Stroker Flywheel Kits / '99-'16 Twin Cam-Flywheels-MetalCore Harley Supply
S&S CYCLES
106" Stroker Flywheel Kits / '99-'16 Twin Cam Sale priceFrom $1,542.56 USD Regular price$1,713.95 USD
REVOLUTION PERFORMANCE-128" | 124" Bolt-On Big Bore Kits / M8 Motors-Big Bore Kit-MetalCore Harley SupplyREVOLUTION PERFORMANCE-128" | 124" Bolt-On Big Bore Kits / M8 Motors-Big Bore Kit-MetalCore Harley Supply
REVOLUTION PERFORMANCE
128" | 124" Bolt-On Big Bore Kits / M8 Motors Sale price$1,455.95 USD
On saleS&S CYCLES-132" Big Bore Cylinder Kits / '17-'23 114"-117" M8-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-132" Big Bore Cylinder Kits / '17-'23 114"-117" M8-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
132" Big Bore Cylinder Kits / '17-'23 114"-117" M8 Sale priceFrom $1,439.95 USD Regular price$1,599.95 USD
On saleS&S CYCLES-129" Big Bore Cylinder Kits / '17-'23 107" M8 Motors-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-129" Big Bore Cylinder Kits / '17-'23 107" M8 Motors-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
129" Big Bore Cylinder Kits / '17-'23 107" M8 Motors Sale priceFrom $1,436.36 USD Regular price$1,595.95 USD
On saleS&S CYCLES-Cam Chest Kits / '17-'23 M8 Motors-Camchest Kits-MetalCore Harley SupplyS&S CYCLES-Cam Chest Kits / '17-'23 M8 Motors-Camchest Kits-MetalCore Harley Supply
S&S CYCLES
Cam Chest Kits / '17-'23 M8 Motors Sale priceFrom $1,422.86 USD Regular price$1,580.95 USD
On saleS&S CYCLES-124" Big Bore Cylinder Kit for 107" / M8-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-124" Big Bore Cylinder Kit for 107" / M8-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
124" Big Bore Cylinder Kit for 107" / M8 Sale priceFrom $1,405.76 USD Regular price$1,561.95 USD
Save $156.00S&S CYCLES-131" Stroker Cylinder and Piston Kit / M8 Motors-Big Bore Kits-MetalCore Harley SupplyS&S CYCLES-131" Stroker Cylinder and Piston Kit / M8 Motors-Big Bore Kits-MetalCore Harley Supply
S&S CYCLES
131" Stroker Cylinder and Piston Kit / M8 Motors Sale price$1,403.95 USD Regular price$1,559.95 USD
On saleS&S CYCLES-128" Big Bore Cylinder Kit for 114" and 117" / M8-Big Bore Kit-MetalCore Harley SupplyS&S CYCLES-128" Big Bore Cylinder Kit for 114" and 117" / M8-Big Bore Kit-MetalCore Harley Supply
S&S CYCLES
128" Big Bore Cylinder Kit for 114" and 117" / M8 Sale priceFrom $1,403.95 USD Regular price$1,559.95 USD
On saleS&S CYCLES-Cam Chest Kit without Cams / M8 Motors-Camchest Kits-MetalCore Harley SupplyS&S CYCLES-Cam Chest Kit without Cams / M8 Motors-Camchest Kits-MetalCore Harley Supply
S&S CYCLES
Cam Chest Kit without Cams / M8 Motors Sale priceFrom $1,349.95 USD Regular price$1,499.95 USD
FEULING-Race Series Oil Pump/Camplate Kit / M8 Motors-Camchest Kits-MetalCore Harley SupplyFEULING-Race Series Oil Pump/Camplate Kit / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
Race Series Oil Pump/Camplate Kit / M8 Motors Sale price$899.95 USD
Save $94.89S&S CYCLES-4-1/4" Bore Cylinders / M8 Motors-Cylinders-MetalCore Harley SupplyS&S CYCLES-4-1/4" Bore Cylinders / M8 Motors-Cylinders-MetalCore Harley Supply
S&S CYCLES
4-1/4" Bore Cylinders / M8 Motors Sale price$854.06 USD Regular price$948.95 USD
Save $91.80S&S CYCLES-Rocker Arm Guardian Kit / M8-Rocker Arms-MetalCore Harley Supply
S&S CYCLES
Rocker Arm Guardian Kit / M8 Sale price$826.15 USD Regular price$917.95 USD
FEULING-HP+® High Volume Oil Pump / M8 Motors-Camchest Kits-MetalCore Harley SupplyFEULING-HP+® High Volume Oil Pump / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
HP+ High Volume Oil Pump / M8 Motors Sale price$799.95 USD
Save $83.70S&S CYCLES-Oil Pump with Cam Plate / M8 Motors-Cam Plate / Oil Pump-MetalCore Harley SupplyS&S CYCLES-Oil Pump with Cam Plate / M8 Motors-Cam Plate / Oil Pump-MetalCore Harley Supply
S&S CYCLES
Oil Pump with Cam Plate / M8 Motors Sale price$753.25 USD Regular price$836.95 USD
FEULING-Race Series Camshaft Kits / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
Race Series Camshaft Kits / M8 Motors Sale priceFrom $639.95 USD
FEULING-High Load Beehive® Spring Kit / M8 Motors-Valve Springs / Retainers / Seals-MetalCore Harley Supply
FEULING
High Load Beehive Spring Kit / M8 Motors Sale price$599.95 USD
REVOLUTION PERFORMANCE-M-Eight Tap-It-Right Kits / M8 Motors-Lifter Blocks-MetalCore Harley SupplyREVOLUTION PERFORMANCE-M-Eight Tap-It-Right Kits / M8 Motors-Lifter Blocks-MetalCore Harley Supply
REVOLUTION PERFORMANCE
M-Eight Tap-It-Right Kits / M8 Motors Sale price$575.95 USD
On saleJIMS-Forceflow Cylinder Head Coolers / '99-'21 Bagger, '18-'21 Softail-Head Cooler-MetalCore Harley SupplyJIMS-Forceflow Cylinder Head Coolers / '99-'21 Bagger, '18-'21 Softail-Head Cooler-MetalCore Harley Supply
JIMS
Forceflow Cylinder Head Coolers / '99-'21 Bagger, '18-'21 Softail Sale priceFrom $567.86 USD Regular price$630.95 USD
On saleS&S CYCLES-475 Camshaft Kit with Dynojet PV-3 / '17-'19 M8 Motors-Camchest Kits-MetalCore Harley SupplyS&S CYCLES-475 Camshaft Kit with Dynojet PV-3 / '17-'19 M8 Motors-Camchest Kits-MetalCore Harley Supply
S&S CYCLES
475 Camshaft Kit with Dynojet PV-3 / '17-'19 M8 Motors Sale priceFrom $566.06 USD Regular price$628.95 USD
Save $61.20S&S CYCLES-Roller Rocker Arms / M8-Rocker Arms-MetalCore Harley Supply
S&S CYCLES
Roller Rocker Arms / M8 Sale price$550.75 USD Regular price$611.95 USD
Save $32.00DARKHORSE MOTOR COMPANY - Man O - War Motor Sprocket / M8 Motor - Motor Sprocket - MetalCore Harley Supply
DARKHORSE MOTOR COMPANY
Man O-War Motor Sprocket / M8 Motor Sale price$547.00 USD Regular price$579.00 USD
On saleS&S CYCLES-High Efficiency Oil Pumps / M8 Motors-Oil Pump-MetalCore Harley SupplyS&S CYCLES-High Efficiency Oil Pumps / M8 Motors-Oil Pump-MetalCore Harley Supply
S&S CYCLES
High Efficiency Oil Pumps / M8 Motors Sale priceFrom $529.16 USD Regular price$587.95 USD
FEULING-HP+ Camshaft Kits / M8 Motors-Camchest Kits-MetalCore Harley Supply
FEULING
HP+ Camshaft Kits / M8 Motors Sale price$519.95 USD
FEULING-Cylinder Head Breathers / M8 Motors-Head Breathers-MetalCore Harley Supply
FEULING
Cylinder Head Breathers / M8 Motors Sale price$479.95 USD
FEULING-HP+ High Volume Oil Pumps / M8 Motors-Oil Pump-MetalCore Harley Supply
FEULING
HP+ High Volume Oil Pumps / M8 Motors Sale price$429.95 USD
Save $45.89S&S CYCLES-350G Gear Drive Camshaft Kit / M8 Motors-Cam Kit-MetalCore Harley Supply
S&S CYCLES
350G Gear Drive Camshaft Kit / M8 Motors Sale price$413.06 USD Regular price$458.95 USD
FEULING-Endurance Beehive® Valve Spring Kit / M8 Motors-Valve Springs / Retainers / Seals-MetalCore Harley SupplyFEULING-Endurance Beehive® Valve Spring Kit / M8 Motors-Valve Springs / Retainers / Seals-MetalCore Harley Supply
FEULING
Endurance Beehive Valve Spring Kit / M8 Motors Sale priceFrom $399.95 USD
FEULING-Cylinder Stud and Head Bolt Kits / '84 and UP Big Twin-Head Bolts-MetalCore Harley SupplyFEULING-Cylinder Stud and Head Bolt Kits / '84 and UP Big Twin-Head Bolts-MetalCore Harley Supply
FEULING
Cylinder Stud and Head Bolt Kits / '84 and UP Big Twin Sale priceFrom $379.95 USD
FEULING-Cam Support Plate / M8 Motors-Cam Plates-MetalCore Harley SupplyFEULING-Cam Support Plate / M8 Motors-Cam Plates-MetalCore Harley Supply
FEULING
Cam Support Plate / M8 Motors Sale price$379.95 USD
Save $40.70S&S CYCLES-Cam Plate / M8 Motors-Cam Plates-MetalCore Harley SupplyS&S CYCLES-Cam Plate / M8 Motors-Cam Plates-MetalCore Harley Supply
S&S CYCLES
Cam Plate / M8 Motors Sale price$366.25 USD Regular price$406.95 USD
Save $39.59S&S CYCLES-SIDEWINDER® .605” VALVE SPRING KIT / M8 Motors-Valve Springs / Retainers / Seals-MetalCore Harley Supply
S&S CYCLES
SIDEWINDER .605 VALVE SPRING KIT / M8 Motors Sale price$356.36 USD Regular price$395.95 USD
FEULING-Gorilla Rocker Shaft and Stud Kit / M8 Motors-Rocker Arms-MetalCore Harley Supply
FEULING
Gorilla Rocker Shaft and Stud Kit / M8 Motors Sale price$329.95 USD
FEULING-Reaper 538 Cam / M8 Motors-Camshafts-MetalCore Harley Supply
FEULING
Reaper 538 Cam / M8 Motors Sale price$319.95 USD
Save $35.00S&S CYCLES - Heavy Duty Compensator Ramp - Compensator Socket - MetalCore Harley SupplyS&S CYCLES - Heavy Duty Compensator Ramp - Compensator Socket - MetalCore Harley Supply
S&S CYCLES
Heavy Duty Compensator Ramp / M8 Motors Sale price$314.95 USD Regular price$349.95 USD
FEULING-OE+ Camplates / M8 Motors-Cam Plates-MetalCore Harley Supply
FEULING
OE+ Camplates / M8 Motors Sale price$299.95 USD
FEULING-Race Series® Solid Lifters / '99-'22-Lifters-MetalCore Harley Supply
FEULING
Race Series Solid Lifters / '99-'22 Sale price$299.95 USD
FEULING-Head Bolt Kits / '84 and Up-Head Bolts-MetalCore Harley SupplyFEULING-Head Bolt Kits / '84 and Up-Head Bolts-MetalCore Harley Supply
FEULING
Head Bolt Kits / '84 and Up Sale priceFrom $299.95 USD

M8 Softail Engines / Internal Components

Upgrade Your M8 Softail with High-Performance Engine Components

Unlock the true potential of your Harley Davidson M8 Softail with premium internal engine components from Metalcore Harley Supply. Our collection features powerful big bore kits, performance pistons and cylinders, complete camchest kits, upgraded oil pumps, precision camshafts, heavy-duty valve springs, and reliable lifters — everything you need to build serious Milwaukee Eight performance.

Whether you're chasing more horsepower, improved reliability, or a complete engine rebuild, we offer trusted parts designed specifically for your M8 Softail.

Why Choose Our M8 Softail Internal Engine Components:

Build a stronger, faster Harley — shop Metalcore Harley Supply today for all your M8 Softail engine upgrade needs.
Reasons to buy from us banner- Rewards points, Affirm Financing, Fast Free Shipping