NASA CCR states 1.75 x 0.120 CM or DOM (no ERW) for 3001 - 4000 pounds
SSCC states 1.75 x 0.090 DOM or 0.120 ERW, CREW for over 2700 pounds
(roll bar required over 130 mph avg., roll cage required over 160 mph avg.)
SCCA GCR states 1.75 x 0.120 DOM or CM (no ERW) for 3001 - 4000 pounds unless grandfathered (pre 1994).
All of these rule books are available online with more detailed specifications.
We are starting the cage in the OLC Camaro in a couple of weeks, it will be 1.75 x 0.120 DOM throughout.
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James
1967 Camaro RS - The OLC
1967 Camaro RS - Recycler
1969 Camaro - Dusty
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