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  #1 (permalink)  
Old 08-29-2016, 07:19 PM
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New cam for the Ultima 127 suggestions

So far I've heard the S&S 640 and the Redshift 656. I am using my stock Ultima rockers 1.675, S&S pushrods, and S&S hyd lifters. I need a new cam suggestions though!
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Old 08-30-2016, 02:17 PM
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640 SS
This 640 is for 1984–1999 Harley-Davidson® 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, does not require as much compression as the 631. For hydraulic tappet, spring spacing is required.


Mfgr In Open In Close Exh. Open Exh. Close In Duration Exh. Duration Overlap In Lobe Center Exh. Lobe Center LSA In Lift Exh. Lift In Lift TDC Exh. Lift TDC

S&S 640 - 26 60 65 20 266 265 46 107 112.5 109.75 0.64 0.64 0.222 0.192

RedShift656 -28 52 52 26 260 258 54 102 103 102.5 0.648 0.648 0.233 0.219

656V2: This cam is designed for maximum torque, yet produces excellent top end power in 96”-125” street engines. Ideal for use in heavier machines; a real stump puller! Requires moderate compression. Uncomplicated head set-up; moderate TDC lifts make installation of this cam easy. Works best with 9.8-10+:1 compression. Case clearancing required.
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Last edited by pushrod243; 08-30-2016 at 02:22 PM..
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Old 08-30-2016, 02:21 PM
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John, I know you recommended the Redshift 656. And a bunch of people love it. Got some insight on the S&S too, but like most everything 50% will say yes 50% will say no. If I went with the Redshift would that work with my stock rocker arms (1.675)?
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Old 08-30-2016, 02:32 PM
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Yes I think it will I have run the .656 on a 113 with no issues but we checked everything before we ran it. I dont have as much experience with the .640 S&S cams but i generally like thier grinds. i use them more on my twinkie builds than i do the Redshifts. I just have used the .656 redshift a bunch and really love how it runs........

I can get either brand so its your call hopefully others will have some input I tried to post specs to help maybe breath some life into your thread.....I will be here when you are ready......
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Old 08-30-2016, 02:35 PM
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I appreciate it John! When it comes to the specifics, the numbers are nothing more than numbers to me! As much as I read I can't fully wrap my mind around all the numbers. Everything keeps adding up over here! hahaha Just dropped my cylinders off at the machine shop to go +.10 over because of scoring on my cylinder walls.
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