Engine Kits

Chevy SB Thumpr™ Retro-Fit Hydraulic Roller Camshaft Rough Idle
Click On Image To Enlarge

Chevy SB Thumpr™ Retro-Fit Hydraulic Roller Camshaft Rough Idle



Part #: 12-601-8
List Price: $587.98
Our Price: $293.99
You Save: $293.99

Availability: In Stock



Chevy SB .521 lift, Thumpr™ II Retro-Fit Hydraulic Roller Camshaft high performance Street/Strip, needs 9:1 CR and 2500+ stall with lower gears and headers, very choppy idle.

RPM

Duration

Valve Lift

Lobe

Operating

Advertised

@ .050

@ 1.5:1

Sep.

Range

IN.

EX.

IN.

EX.

IN.

EX.

Angle

2200-5900

291

311

235

249

.521

.507

107°

;

Advertised Duration 291 int./311 exh.
Advertised Exhaust Duration 311
Advertised Intake Duration 291
Basic Operating RPM Range 2,200-5,900
Brand COMP Cams
Cam Style Hydraulic roller tappet
Computer-Controlled Compatible No
Duration at 050 inch Lift 235 int./249 exh.
Exhaust Duration at 050 inch Lift 249
Exhaust Valve Lash 0.000 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.507 in.
Grind Number 291THR7
Intake Duration at 050 inch Lift 235
Intake Valve Lash 0.000 in.
Intake Valve Lift with Factory Rocker Arm Ratio 0.521 in.
Lobe Separation (degrees) 107
Notes Designed for engines originally equipped with flat tappet camshaft.
Part Type Camshafts
Product Line COMP Cams Thumpr Retro-Fit Hydraulic Roller Camshafts
Quantity Sold individually.
Valve Lift with Factory Rocker Arm Ratio 0.521 int./0.507 exh. lift