521 CAM - Strong overall torque for 117" engines and stump pulling low to mid range torque in 121"+ engines. Better street manners and less exhaust choice dependant than the 508/538. 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 Gen1 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.
VVT Models: Requires FEULING camshaft sprocket #1095 (HD #25400103), HD timing cup #18400117, Feuling sprocket retention kit #3042 and Feuling camshaft spacers #8041. Must also be able to turn VVT feature off in ECM.
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
DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VECHICLE
Feuling® does not recommend tuning beyond stock emissions standards.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Disclaimer:
This is a RACE ONLY part
Parts designated as “Race Only” are for use only on vehicles used for competition racing and are not for use on vehicles registered for use on public roads. Sale and/or installation of “Race Only” parts in any way inconsistent with this warning is prohibited and may result in enforcement by the U.S EPA under the federal Clean Air Act. “RACE ONLY” PARTS ARE NOT LEGAL FOR SALE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES.
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY EPA POLLUTION CONTROLLED MOTOR VEHICLE.
| Our Dealers / Distributors |
Part # |
| LeMans Corporation |
0925-1210 |
| Neo Factory |
033611 |
| Parts Canada Development Co |
0925-1210 |
| Parts Europe |
0925-1210 |
