I've had 3 sets (3 different brands) of roller rockers on two sets of heads, one pedestal and one stud mount, and they've all made a slight ticking sound. Some brands seem louder than others, but all were installed correctly and operated without problems. Check installation; if correct, turn the radio up to drown out the sound. 
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88 NMRA Pure Street coupe
95 GT-heads, cam, exhaust, intake, road-race suspension
97 Taurus SHO-K&N, ported meter
95 Escort GT-Pacesetter header & exhaust, Weapon R intake tube
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