A lot has happened since 1973 or whenever the Roe book came out.
The angle of the secondary airflaps is well covered in my book with recommendations plus the maximum open point as used on the Edelbrock 1910's.
I verified the maximum open angle by removing the stop and drilling the airhorn for an adjustment screw to find the point of no return or maximum effective angle where going further doesn't improves nothing or has diminishing returns. This testing was done on the dyno and backed up at the track with drag strip runs on several different outings.
When I wrote my book I didn't use any reference material, and have actually never owned the Roe book or have even looked at one since my high school days..........
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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