Gives .425" valve lift on Panhead; .405" on Shovelhead. Mild street cam. Smooth idle; more power throughout RPM range. Installs with no headwork.

Gives .470" valve lift on Panhead; .450" on Shovelhead. Basicly an ''A'' grind cam; but with delayed timing to help eliminate ''pinging''. More power than stock cam. Should install with no headwork.

Gives .507" valve lift on Panhead; .485" on Shovelhead. Hot street. Much more midrange and top end power. Smooth idle. Good choice for modified motors and small strokers. Solid lifters recommended; spring spacing required.

Gives .535" valve lift on Panhead; .510" on Shovelhead. Street/Drags. Hotter version of the Andrews B2 cam. Pulls strong from 2500-6500 RPM. Good street cam for 84"-88" motors. Solid lifters recommended.

Gives .550" valve lift on Panhead; .525" on Shovelhead. Street/drags. Best production cam design for big street engines. Strokers from 84"-96". Broad torque range pulls from 2500-7000+. Solid lifters recommended.

.370" valve lift. Hot street. Much more midrange and top end power. Smooth idle. Good choice for modified motors and small strokers. OK with stock springs. This is the Knuckle equivalent of the Shovel B cam. Note: Knuckle cam bearings are ground to .8115" to fit stock bushings.

.427" valve lift. The low compression version of the ''A'' cam. To be used on engines that have low compression (1:8 C.R. or less) pistons installed. The reduced duration improves performance.

.490" valve lift. The low compression version of the Andrews B cam. High lift combined with short duration will improve performance on low compression engines (8:1 C.R. or less). Note: For 81-82 models. The height of original stock H-D valve guides restricts spring travel (and valve lift) to .430" or lower.

.514" valve lift. For 84" to 93" strokers with no greater than 9:1 CR. Best gains occur in the mid range from 2500 to 5000 rpm where most riding is done. Relatively quiet and easier on the valve train than most other cams with lifts as high. Solid lifters or aftermarket hydraulic tappets are recommended; valve spring spacing and other normal clearancing checks required. 2500-5000 RPM.

.640" valve lift. Big inch engines with 10.5/11.5:1 CR. Smaller engines with 11:1 to 12:1 CR. With lower TDC lifts; faster ramps and shorter duration it builds higher cyl. pressure and requires less CR and offers a more linear power delivery as the 631. Supplied with the S&S 124" SSW+ engines. 3000-6000 RPM.