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Dwight Southerland · 12-14-2013, 09:52 AM

Correction to my earlier post - minimum weight for A was 3350, according to 1981 rulebook.

Originally, the head limitation was the big deal. You could do anything to the combustion chamber except weld. Limited to 1" porting below the valve seat and 1/4" at the intake port opening. SM racers "found" the 461X heads for C/SM with bigger ports. B class Chevies ran the 292 "Turbo" head with angle plugs. Short stroke big block Chevies were common in A. The Cleveland Mavericks were the scourge in B: Garley Daniels and the Chevy IIs were the ones to beat in C.

Some of my observations for the new class discussions:
1) The spec head idea is good. Something to eliminate limitless spending on heads.
2) Consider limiting to steel valves.
3) Single 750 carb.
4) How about a 10 1/2" tire limit?
5) Hood scoop maximum of 7" above the hood surface at any point. Cut out the goofiness and that gives a little advantage to older bodies.

12-14-2013, 09:52 AM	#210
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 Correction to my earlier post - minimum weight for A was 3350, according to 1981 rulebook. Originally, the head limitation was the big deal. You could do anything to the combustion chamber except weld. Limited to 1" porting below the valve seat and 1/4" at the intake port opening. SM racers "found" the 461X heads for C/SM with bigger ports. B class Chevies ran the 292 "Turbo" head with angle plugs. Short stroke big block Chevies were common in A. The Cleveland Mavericks were the scourge in B: Garley Daniels and the Chevy IIs were the ones to beat in C. Some of my observations for the new class discussions: 1) The spec head idea is good. Something to eliminate limitless spending on heads. 2) Consider limiting to steel valves. 3) Single 750 carb. 4) How about a 10 1/2" tire limit? 5) Hood scoop maximum of 7" above the hood surface at any point. Cut out the goofiness and that gives a little advantage to older bodies.