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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
yes, you need to have your pistons machined to use those valves with stock rotating assembly. and if you doget the pistons machinedid say 260 rwhp at best.
and another thing is, i am no professional engine builder but, isnt that an awefully large amount of lift for just a 302? if im not mistaken, thats damn near .600" lift on the exhaust side. that might b ok sitting in a 347 but just for a 302 it may b a bit much. just my .02