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Insist On The Real Deal! - Zodiac

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SPECIAL CAMS GENERATOR STYLE ENGINES WITH 1984-’99 STYLE VALVE TRAIN<strong>The</strong>se cams are generator version of our regular camsfor 1984-’99 big twin engines. <strong>The</strong>y were originallydeveloped for our custom "retro" 1984-‘99 styleengines for four-speed big twin frames. <strong>The</strong>y are alsoused in S&S complete generator style engines for shovelchassis, and are required for any 1966-'69 shovel engineequipped with S&S hydraulic tappet update kits. (Seepage 34.)See "Cam Specification Chart" on page 31 for overall cam timinginformation.S&S 1984-'99 STYLE CAMSIN S&S COMPLETE ENGINES FOR SHOVELHEAD MODELSComplete S&S engines for shovelhead models are equippedwith special billet tappet guides designed to use S&S tappetsfor 1984-’99 big twins. <strong>The</strong> late style tappet has a larger rollerdiameter than stock tappets for shovelhead engines. <strong>The</strong>refore,in order to achieve correct valve timing, cams designed for1984-’99 models must be used in these engines, or in anyshovelhead engine equipped with S&S billet tappet guides.When choosing a late style cam for this type of engine, beaware that the timing specifications will remain unchanged, butthat the total valve lift will be reduced by about 9% from thespecified value, due to the approximate 1.5:1 rocker ratio of mostaftermarket rocker arms for shovelheads. S&S cylinder heads forshovels can accommodate cams with up to .590” actual valvelift. That translates to about .640” specified lift in a camshaft for1984-’99 engines.1984-'99 STYLE BIG TWIN CAMS FOR GENERATOR CRANKCASESDescriptionLift in 1984-'99 StyleCylinder HeadsLift in 1966-'84 StyleCylinder HeadsCam <strong>On</strong>lyS&S® 502G Cam <strong>On</strong>ly - 1984-’99 style for 1948-'69 cases .502 .463 33-5074S&S 510G Cam <strong>On</strong>ly - 1984-’99 style for 1948-'69 cases .510 *.470 33-5134S&S 561G Cam <strong>On</strong>ly - 1984-’99 style for 1948-'69 cases .561 .517 33-5077S&S 585G Cam <strong>On</strong>ly - 1984-’99 style for 1948-'69 cases .585 *.540 33-5131S&S 600G Cam <strong>On</strong>ly - 1984-’99 style for 1948-'69 cases .600 *.554 33-5132S&S 631G Cam <strong>On</strong>ly - 1984-’99 style for 1948-'69 cases .631 .581 33-5078* Denotes cams supplied in S&S engines for 1966-'69 big twin.NOTE: 1984-'99 lift bases on 1.65:1 ration rocker arms. 1966-'84 lift based on S&S ratio rocker arms.32 CamshaftsEmail us at sscust@sscycle.com

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