S&S Cycle

1926–'84 vintage engines

RETRO CONVERSION KIT FOR 1966–’84 BIG TWINS FITMENT • 1966–’84 big twins • 1954–’65 big twins with shovel cylinders FEATURES AND BENEFITS • Gives a shovel engine the retro look of a pan • S&S heads improve performance with increased air flow • Quiet, dependable valve train with hydraulic tappets OPTIONS • Stock or 35/8" bore • Dual spark plugs available on 35/8" bore heads • Internal or external oil returns

1984–1999 Evolution ® 1926–1984 Vintage Engines Tools & Shop Supplies Warranty & Company Policy Appendix & Index

RETRO CONVERSION KITS FOR 1954–1984 BIG TWINS Application Bore Option

Part #

106-1070 106-1071

Stock

Single Plug Single Plug Dual Plugs

1966–'84 bt S&S SH-Series

35/8"

106-1078 DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. Not legal for sale or use on any EPA pollution controlled motor vehicle. These kits have internal oil drains.

LATE STYLE CAM RECOMMENDATIONS FOR SHOVELHEAD ENGINES WITH RETRO CONVERSION KIT Application RPM Range Compression Ratio

If You Used… Then Use… Generator Style

Alternator Style

74" - Stock 84" low compression 74" and 80"–Modified

106-6028

106-6027

Low–Mid

8.5 and below S&S 450 or Andrews® J or A

S&S 513

33-5131 33-5131 33-5132

33-5109 33-5109 33-5058 33-5108

Mid–High Low–Mid Mid–High

8.5 - 9.5 8.0 - 9.0 9.0 - 10.0 Over 10.0

S&S 514 or Andrews #3 or B

S&S 585 S&S 585 S&S 600 S&S® 640

84" - 93"

S&S 514

93" HC - 103"

S&S 495 or 560S S&S® 495 or 565S

-

High Compression

High

NOTES: The S&S Retro Conversion Kit requires that a 1984–‘99 style cam be used to ensure correct valve timing due to the roller size on the late style tappets use in the kit. 1970–’77 stock engines will also require a 1978–’87 style pinion gear to mate with the late style cam gear. 1966–’69 engines or other engines with generator style crankcases will require a special generator style cam with 1984–’99 style lobes. See chart for recommendation. 1979–’84 o-ring style pushrod covers are required; S&S part #93-4040 or equivalent.

REPLACEMENT PARTS: SEE PAGE 188

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