Race Series "Oil Cooled Full Travel" Camchest Kits / M8 Motors

Feuling Race Series camchest kit with full travel lifters, for oil cooled M8 motors.

Full travel lifters are the forgiving choice, and the cam list reflects that. This is the Race Series kit for a build where the oiling system is the upgrade and the cam is a moderate step rather than the point of the exercise, a bike that still has to commute.

The oiling package is identical across the Race Series line: a billet 7075 aluminium oil pump, 50 percent harder than the factory unit, a High Flow billet 7075 camplate, and scavenge kidney ports cut deeper than the HP+ series. What changes here is the lifter, running full 0.200" travel with a slower bleed-down rate, which handles heavy spring pressure while staying tolerant of a near-stock valvetrain.

Features

• Billet 7075 aluminium Race Series oil pump, 50% harder than the factory pump
• High Flow billet 7075 aluminium camplate
• Race Series full travel hydraulic roller lifters, 0.200" total travel
• Fixed length pushrods, Timken and Koyo cam bearings
• Magnets in the oil pump to protect the gears and pressure relief valve
• Feuling states 27% more pressure and scavenge gear volume over stock on the oil cooled M8
• Feuling states 46% more oil volume to the crankshaft and connecting rod bearings
• Feuling states 15 to 25 degrees cooler engine temperature
• Feuling states 15 to 30 degrees cooler oil temperature
• Feuling states 10 to 30 more psi of oil pressure
• Feuling states roughly a 50% reduction in engine sump oil level
• Feuling testing shows 2 hp and 2 ft-lb gained at the rear wheel
• Made in the U.S.A.

Specifications

Four Reaper grinds, listed mildest first. Valve lift is given intake / exhaust; full timing figures are on the individual Reaper cam listings.

• 465 Reaper, 0.445" / 0.465" lift. The mildest grind here, and no valve spring upgrade required.
• 472 Reaper, 0.468" / 0.472" lift. A small step up, still no valve spring upgrade required.
• 487 Reaper, 0.478" / 0.487" lift. New for 2026, and the largest grind in this kit that runs on stock valve springs.
• 538 Reaper, 0.538" / 0.542" lift. The biggest grind here, and the only one that requires high lift valve springs.

Fitment

• '17-'25 M-Eight, oil cooled motors only

Not for Twin Cooled motors, and not for '23-'25 models with the 121" VVT motor.

Before You Order

Valve springs. The 538 kit requires high lift valve springs, the Endurance Beehive Valve Spring Kit for M8, in either the factory retainer or titanium retainer version. These are not included and are not optional. The 465, 472 and 487 kits carry no spring requirement.

Emissions: Drag Specialties lists these kits under different EMIS categories. What the emissions codes mean

• EMIS 1 for the 465 and 472 Reaper options. Drag lists these as exempt per CARB Executive Order #D-881-1 for '17-'24 Milwaukee-Eight models.
• EMIS 3 for the 487 and 538 Reaper options.

⚠ VERIFY your cooling type before ordering. This kit is for oil cooled motors only, a Twin Cooled M8 takes the Twin Cooled version.

Common Questions

Which grind can I run without changing valve springs?
The 465, 472 and 487. Only the 538 in this kit requires high lift springs, which is worth knowing before you price the job, since springs add cost and labour on top of the kit.

Full travel or short travel lifters?
Full travel runs 0.200" of travel with a slower bleed-down rate and is the more forgiving choice on a near-stock valvetrain. Short travel reduces valve float at higher rpm and suits a build chasing revs.

How do I know if my M8 is oil cooled?
Twin Cooled motors run coolant lines to the heads and a radiator behind the front fender. If yours has neither, it is oil cooled.

What does the EMIS category mean for me?
It is Drag Specialties' emissions classification for the part, and it differs by grind here. The 465 and 472 are listed under a CARB Executive Order; the 487 and 538 sit in a different category. Our emissions information page explains each category in the words of CARB, SEMA and Drag Specialties.

About Feuling

Feuling Parts builds Harley-Davidson valvetrain and oiling components in the U.S.A., and is best known for oil pumps, camplates and the Reaper camshaft line. Their reputation rests on the oiling side of the motor, the parts that decide whether a cammed engine lasts.

Works With

The 538 grind needs the Endurance Beehive Valve Spring Kit for M8. Chasing higher rpm? See the Race Series short travel camchest kits. Running a Twin Cooled M8? That motor takes the Twin Cooled version of this kit. If you are only after the oiling upgrade without a cam change, the Race Series Oil Pump & Camplate Kit covers the pump and camplate on their own.