508 CAM - The Grim Reaper Aggressive pulling power with a nasty sound. This camshaft revs up faster than the 521 grind, sounds nastier and pulls harder but is more difficult to tune. The REAPER 508 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 # 1349 RPM range 2,250 - 5,900. Grind: 508

.................. Valve Lift Open Close Duration @ 50 lift @ TDC Lobe Centerline
Intake .508 20.5 BTDC 37 ABDC 237 .180 98.5
Exhaust .511 44 BBDC 17.5 ATDC 241.5 .146 103.25
Overlap: 38

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

DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VECHICLE

Feuling does not recommend tuning beyond stock emissions standards.