There are solid roller conversions that will minimize the risk of failure and still have the "sound" that the tappets make. Find, or have made, a grind that is very similar to original and use that instead. Is anyone going to know if it's an original style tappet or roller lifter making the ticking noise? 
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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