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I believe that is the way the Brinn Predator is also. When in high gear, it only turns the input and output shaft and not the entire gear cluster like the original Brinn trans does hence free...

I spoke with the ProFab guy at a motorsports show last year. He said they had dyno'd a set at Hendren on Dillion Brown's 604 car and there was a gain of 5 HP. Didn't say where that HP was in the RPM...

Brad,
We run a RUSH 604 dirt late model. Mostly interested in comparison between the 1" HVH that everyone runs and the newer 5/8" to see which would be the most beneficial.

Most of the Stealths are 700 cfm and the Bakers are 750. That is what most guys around here are running. We had good success with one of the old 750 Stealth carbs that had the extra 1/2" spacer...

Brad, I have a new question that I'm interested to learn about pertaining to the 604. Which carb spacer makes the most power on the dyno and which one do you recommend? And where would that power...