You CAN fit rockers under stock valvecovers. I did...1.6 full rollers. How? Grind out all the baffling inside the valvecovers. But unless you want oil in your intake and IAB valve, you're gonna have to plug the PCV return lines and run a breather. It's ghetto but hey, works for me.
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'91 Mustang GT 5.0 AOD Daily Driver
Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI
13.73 at 103.8, ~2.2 60'
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