No way a "regular" BBC rocker will work! Body is too long both ends from trunnion. Even with the 0.090 offset trunnion BBC 1.8 SS Crower rocker I have on the intakes of my 455 in the 78 they are a hair long(a 0.120 offset would be better but not made) and needed a shorter pushrod to get even close. And it shoves the pushrod back since it is longer than the Pontiac back half, so no need to grind for the higher ratio for pushrod clearance. Russel Wells here a fe years ago used them on some heads that had not been ground enough for Pontiac high ratio rockers.
Never had an issue with Pontiac 1.5 or 1.65 Harland Sharps on my early E heads with HFT or larger roller springs hitting anything.
Crower SS are by far the best-have the biggest trunnion bearing out there. Comp SS are good(have them on the 470/409) and a little cheaper than the Crower. The old Norris SS HO Racing used to carry and you could also buy direct are good-not sure if they still sell stuff. HS are good but not near the tightness on trunnion bearing as the Crowers.
Scorpions were way too bulky to fit under the cast valve covers I was using so I sent them back.
Now my Crower SS Shaft sytem is really nice and rocker bodies look nicer than their aluminum or the T&D ones I have. Shafts are kind of a pain to set stand height then ifgure where to have the cup when choosing pushrod length.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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