521 Cam has 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.
• Aggressive power with a nasty sound
• RPM range 2,250-6,250
• Ported cylinder heads are not required but will complement the cam
• High lift valve springs required
• High performance pushrods and lifters recommended
521 Cam Information:
• Intake open/close 17° /34°
• Exhaust open/close 51.5° /11.5°
• Intake duration 231°
• Exhaust duration 243°
• Intake lift at TDC .162°
• Exhaust lift at TDC .125°
• Intake lobe centerline .98.5°
• Exhaust lobe centerline .110°
• Intake Lift .518"
