FEULING OIL PUMP CORP. Cam - 521 Series - Harley-Davidson 2017-2021 - M8 1346

521 CAM - Aggressive pulling power with a nasty sound, the REAPER 521 grind will shine in 114 and larger cubic inch engines with added compression ratio. Ported cylinder heads are not required but will complement the cam and add even more pulling power throughout the range. The stock throttle body produces an excellent powerband and use of a high flow throttle body will increase peak power numbers. A high flow exhaust system and air cleaner is highly recommended for optimal performance. FEULING recommends matching this cam with our RACE SERIES oiling system.

NOTE: High Lift valve springs are required on stock cylinder heads, see FEULING BEEHIVE valve spring kit #1107 (DRAG# 0926-2973) or #1108 (DRAG# 0926-2974). SE cylinder heads have high lift valvesprings and will accept the 508 and 521 grind cam. Heavy Duty one piece pushrods are also highly recommended see #4087.

Part # 1346 RPM range 2,250 - 6,250. Grind: 521

Valve Lift Open Close Duration @ 50 lift @ TDC Lobe Centerline
Intake .518 17 BTDC 34 ABDC 231 .162 98.5
Exhaust .521 51.5 BBDC 11.5 ATDC 243 .125 110
Overlap: 28.5

Cam specs measured in the engine on the lifter @ 0.050 using a 1.61 rocker arm ratio

• Aggressive pulling power with a “nasty” sound, the Reaper 521 grind will shine in 114” (EU: 1,87 L) and larger cubic inch engines with added compression ratio
• Ported cylinder heads are not required, but will complement the cam and add even more pulling power throughout the range
• Stock throttle body produces an excellent powerband; use of a high-flow throttle body may increase peak power numbers
• A high-flow exhaust system and air cleaner is highly recommended for optimal performance

Fitment Guide

Specs