the only reason a cam gear is any use on a SOHC engine without an aftermarket cam is to adjust cam timing to suit your powerband.. retarding the cam will shift the powerband up in rpm, and advancing will shift it down. either way, you will stil need dyno tuning to confirm the new powerband. other than that, they are used for tuning cam overlap on DOHC engines and for degreeing in an aftermarket cam on a SOHC.