Due to the .250 offset in the cam chest of Special Application (SA) S&S® crankcases for 1984-'99 HD® big twin engines, special tappet guides with corrected pushrod tube angles must be used to assure a proper pushrod tube seal and prevent oil leaks.Natural Aluminum
S&S® engines for 1984-’99 chassis with larger than 3 13/16" bores are typically built using special crankcases such as S&S Special Application cases which have an offset
right side gear cavity for more tappet guide to cylinder clearance. S&S offers special tappet guides machined to compensate for the change in pushrod angle caused
by the cam chest offset of these cases.