The boss will be milled and the new springs installed to 1.8" as Butler recommends.
Unbelievable that someone doing your heads messed that up. I don't know enough about springs, but wondering why they would have used a double spring with damper. What new springs are you going with?
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
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