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This 640 is for Evolution Big Twin models with large displacement motors with compression ratios of 10.5 - 11.5:1 or smaller motors with 11:1 - 12:1 compression ratio. The nice part is that this cam does not require as much compression as the 631.
Made in the USA
Product Note:Spring spacing is required for use with hydraulic tappets.
Specification
Details
Country of Origin
USA
Engine Type
Evolution Big Twin
Exhaust Duration
270 degrees
Exhaust Lift
.214 in.
Exhaust Lobe Center
110 degrees
Exhaust Timing (Close)
25 degrees
Exhaust Timing (Open)
65 degrees
Intake Duration
265 degrees
Intake Lift
.228 in.
Intake Lobe Center
107.5 degrees
Intake Timing (Close)
60 degrees
Intake Timing (Open)
25 degrees
Valve Lift
.640 in.
Vehicle Fitment
Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.
