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Thumpr 243/257 Hydraulic Flat Cam for AMC 290-401

Thumpr 243/257 Hydraulic Flat Cam for AMC 290-401

Beehive™ Valve Springs: Top .959

Beehive™ Valve Springs: Top .959" O.D., .636" I.D.; Bottom 1.061" O.D., .738" I.D.

Dual Valve Springs: 1.550" O.D. Outer, .724" I.D. Inner

was $494.95 Special Price $445.46
In stock
SKU
999-16

Dual Valve Springs from COMP Cams® are manufactured from H11 material and subject to extensive quality control testing to deliver a valve spring assembly with superior strength, durability and valve train stability, no matter the application. The dual spring design creates a stronger valve spring that can easily handle the increased lift found in extreme stress applications. COMP Cams® Dual Valve Springs exceed the expectations of today’s engine builders and racers.

More Information
UPC 036584280132
Manufacturer COMP Cams®
Emissions Code N/A
Max Lift 0.75
Installed Height 1.9
Coil Bind Height 1.09
O.D. of Outer 1.551
I.D. of Inner 0.712
I.D. of Outer 1.094
Spring Style Dual
Spring Rate 633
Seat Pressure 215
Damper Yes
Recommended Components
Component Part Number
Steel Retainers 732-16
Steel Retainers 721-16
Tool Steel Retainers 1732-16
Spring Cup (O.D. Locator) 4700-16
Spring Seat (.570" Guide Dia.) 4781-16
Spring Seat (.630" Guide Dia.) 4782-16