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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.
with certian pistons and certian cams and certian rods, you increase the risk of pistons smacking valves. so yeah you might have to buy new ones or have yours cut up alittle bit
i just bolted the gt 40p's right on mine and it does pull harder at top end where it needed it most. i didnt change the rockers, cam, intake, or headers as i was and still am strapped for the cash flow. if you got the money go for it all or anyone of those improvements. 1.6:1 roller rockers will work without any valve to piston problems but if you go 1.7:1 or switch to a bigger cam i would have have the valve to piston clearence checked just to make sure nothing meets together and causes alotta problems.