S&S Cycle Oil Pump for T-Series Engines and Harley-Davidson Twin Cam 88 Engines, Including Standard and Easy Start Camshafts - Manual (Page 4)

1- Cranking compression numbers are no longer a valid health check of the engine. We recommend performing a leak down test.
2- S&S recommends that you install new lifters when installing new cams
3- If any service work is performed and the lifters are not replaced, the lifters must be installed in the original position and orientation.
4- If the lifters have been disassembled or bled down for any purpose, the starter may have difficulty with the initial start. Although the
decompression lobe lifts the lifter body, the lifter is not pumped up and it will not lift the exhaust valve. You may need to remove the spark
plugs and crank the engine to get oil pressure to the lifters.
5- There is no service required with these cams. If you ever have the cams out for any reason, inspect the mechanism for wear and verify that the
lever operates smoothly.
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.
See picture 3, below. Be sure to use blue 243 Loctite® on the threads and torque to 32 in-lbs.
4
Picture 3
Cam Intended Displacement Intended Compression Ratio
551 88–106 9.0–10.0
570 88–106 9.0–10.0
583 88–106 9.0–10.0
585 88–106 9.2–10.5
625 95+ 10.0–10.75
640 95+ 10.5–11.5
675 120+ 11+