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Dwight Southerland · 12-13-2013, 11:56 PM

The first SM class was 9.5 lbs/ci including driver and 3000 lbs for small blocks, 3250 for big blocks. The next year, when they expanded to A, B & C/SM, the weight breaks were 8.5, 9.5 and 10.5. A was for big blocks with a 3250 lb minimum (or was it 3300?), B was for small blocks with a 3000 lb minimum and any OEM cylinder head, C was for small blocks, true wedge head (valves in a straight line) production only. A allowed an 850 cfm carb, B & C used a 750 carb.

12-13-2013, 11:56 PM	#208
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,003 Likes: 64 Liked 784 Times in 196 Posts	Re: OLD Modified Corvettes The first SM class was 9.5 lbs/ci including driver and 3000 lbs for small blocks, 3250 for big blocks. The next year, when they expanded to A, B & C/SM, the weight breaks were 8.5, 9.5 and 10.5. A was for big blocks with a 3250 lb minimum (or was it 3300?), B was for small blocks with a 3000 lb minimum and any OEM cylinder head, C was for small blocks, true wedge head (valves in a straight line) production only. A allowed an 850 cfm carb, B & C used a 750 carb.