Switching from a 4412 2 Barrel to a 4 Barrel

Will we see a change in RPM when switching from a high compression 406 with a 500 Holley to a 10.5 to 1 360 with stock GM 487 heads and a Holley 4150 4 barrel? Anyone ever make a similar change? Wondering if we'll need more or less gear to turn the same RPMs? Thanks.

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Originally Posted by Verdoorn Racing

Will we see a change in RPM when switching from a high compression 406 with a 500 Holley to a 10.5 to 1 360 with stock GM 487 heads and a Holley 4150 4 barrel? Anyone ever make a similar change? Wondering if we'll need more or less gear to turn the same RPMs? Thanks.

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When i was testing it for staley last year i ended up with 30 points more gear. I had a crappy out of the box carb though. Now i've got a ultra hp thats about 20 hp better. I was running a 6.20 in worthington with a 406 and used a 6.50 with the 4bbl/360 combo. Turned 7300 but the track was a gravel road..lol

I ran less gear when I ran 4 barrel.