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I am building a "68" T-120 engine with cams: intake marked E3134 on one side and E3325 on the other, exhaust is marked E5948. I'm wondering what effect using different tappets would do to overall performance, response, and durability. I have 'R' tappets in the intake and standard in the exhaust. I have a set of standard intakes and a set of 'R' exhausts available. And can anyone tell me the radius length to get the proper surface arc for resurfacing each type. Mine have a tiny grove across each face that could use some attention.
Thanks,
Jim.
 
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