I was talking to my local speed shop rep. I was interested in the K&N Stub Stack for my speed demon to increase the CFM. He said it wouldn't fit the demon carb because of the shape of the choke horn. He also said that the demon carbs aready flow more than what they're rated at. My 850 is actually supposed to flow 910. A 750 should be flowing 810. I never asked what the 600/650's flow but I'm sure they're close to 660/710.

Just thought I'd pass on that info.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley