Crane full roller 1.5's, Erson full roller 1.65's, and currently Harland Sharp full roller 1.65's ALL fit under OEM Pontiac rocker covers. Of course, I ALWAYS use the FelPro Ram Air IV 1/4" thick rocker cover gaskets which give just enough clearance when using OEM covers.
BTW, the FelPro Ram Air IV rocker cover gasket set PN is: VS50005AC. Nice quality.
Hope this helps.
Later,
"455HO" Lloyd
1972 Formula 455HO; Lucerne Blue; 12.96 @ 104 MPH @ the '03 PSN's; 12.50's or bust this year!
1970 GTO 455HO; Palomino Copper
1972 GTO 455HO; Sundance Orange
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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