Circle Track Magazine discovered this model and featured it in one of their issues. That started the racers calling. Fits the very popular 4412 Holley 2 barrel by removing the choke assembly and leaving the choke tower untouched. Gigantic increase in air flow and lots of horsepower. The small block with about 340 -360 HP can expect 15 -17 HP increase. In the 400 - 420 HP range the increase climbs to 20 - 22 HP. If your engine builder tells you that is impossible, just take one to him and run it on the dyno. Two sizes are available to provide all the air you'll ever need.
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