i am building up a 327 street motor. i will have @ 9.5 compression and somewhere between 375-400hp. I am looking at the speed demon 650 Vacuum secondary and want to know what kind of experiences everyone has had with them.

 

I ran a 850 DP on my 383 race engine. It's now going onto a 454. I won't go back to a holley unless it's one of the newer HP models.

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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