Quote:
Originally Posted by Stan Weiss
Jay,
I am not sure how these stack up, but Ultra Dyne had some very aggressive solid flat tappet lobes with 0.020" to 0.050" in the high 20 degree range in the NF series.
Stan
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That is a good example of what I was referring to deciphering mechanical cam cards that stick with the .020” rating. Those NF series cams from Ultradyne used a .0106” lash ramp design instead of the normal .0176” designs. They have a lash setting of .016”, but the duration is rated at .020” tappet. With the shorter ramp design the valve is starting to opening before the cam hits .020” tappet, and will have more seat timing than what the cam card lists. I don’t know for sure if Crower does the same thing on their mechanical cams.