S&S Cycle Oil Pump for T-Series Engines & Harley-Davidson Twin Cam 88 Engines - Manual (Page 3)

Next, install an O-ring and mount the flywheel cavity return fitting on the S&S oil pump body using the included 8-32 x 5 ⁄
8
” socket head
cap screws. Be sure to use blue 243 Loctite ® on the threads and torque to 32 in-lbs.
3
Valve to Piston Clearance Chart
Harley-Davidson ® Pistons*
Head Cam
Style 510G 570G 585G 625G 640G 675G
Stock OK OK OK OK 1 1
S&S 79cc OK OK OK 1 1 1
S&S 89cc 2 2 2 2 2 2
S&S ® Gear Drive Camshaft for S&S Oil Pump for Applications
Cam
Valve Timing
Valve Duration
Valve
Centerline Lift @ TDC
Name
Open / Close
Lift
Intake Exhaust Intake Exhaust Intake Exhaust Intake Exhaust
510GP 20°/ 38° 52° / 20° 238° 252° .510" 99° 106° .187" .179"
570GP 20°/ 40° 55° / 20° 240° 255° .570" 100° 107.5° .187" .179"
585GP 20°/ 45° 60° / 20° 245° 260° .585" 102.5° 110° .186" .179"
625GP 20°/ 55° 60° / 20° 255° 260° .625" 107.5° 110° .189" .184"
640GP 25°/ 60° 65° / 25° 265° 270° .640" 107.5° 110° .228" .214”
675GP 25°/ 64° 70° / 25° 269° 275° .675" 109.5° 112.5° .235" .205”
Chart 1
Chart 2
*Using unmodified heads with .045" head gaskets.
OK No Clearancing needed.
1 Valve to piston clearances must be checked.
2 Valve pockets in pistons must be modified.
Photo 3