I've read lotsa stuff on the various forums that has to do with clearancing the pushrod holes when you use 1.6 or 1.65 roller rockers. Some say you must, some say you might, some say you don't have to. Is there a solid answer? Are some heads open enough? David
http://kurtspontiac.homestead.com/DavidJones69GTO.html
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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