Reaper® 521 Lever

Aggressive drag power and distinctive sound; the Reaper 521 grind excels in 114" or larger engines with increased compression ratio.
No ported heads required, but they complement the camshaft and improve power across the entire rev range.
The standard throttle body offers excellent power delivery; using a high-flow throttle body can increase maximum power.
A high-flow exhaust system and air filter are highly recommended for optimal performance
EU: Powerful traction and aggressive sound; the Reaper 521 grind excels in engines of 1.87 L or more with increased compression ratio.
RPM range: 2,250–6,250.
Manufactured in the USA
Camshaft specifications measured in-engine at 0.050 using a 1.61 rocker arm ratio
Feuling recommends pairing the 521 camshaft with the Race Series lubrication system.
Requires high-lift springs.
High-strength one-piece pushrods are also highly recommended.
Not suitable for '23-'24 models with 121" VVT engines.



Specifications


Brand
FEULING PARTS


Supplier reference
1346


Application
Exhaust, Intake


Intake cam centre
98,5°


Exhaust cam centre
110°


Intake closure
34°


Exhaust Clamp
11,5°


Intake duration
231°


Exhaust duration
243°


Intake valve lift
0,518"


Intake valve lift at TDC
0,162"


Exhaust valve lift
0,521"


Exhaust valve lift at TDC
0,125"


Model
Reaper


Product name
Cam


Type
Chain


Units
Unit


Open intake valve
17°


Open Exhaust Valve
51,5°


Version
Serie 521