12% HORSEPOWER GAIN WITH PROFORM CARB SPACER
Recent dyno testing at Adrenaline Autosports, in Chatsworth, CA, on a mildly built Ford 302, fitted with stock 289 heads, revealed incredible results. Baseline numbers with a 600-cfm Holley carb and no spacer produced 218.57 rear wheel horsepower at 5500 rpm with 252.97 ft-lbs. of torque. The carb was switched to a 680-cfm QFT street carb, manufactured with a Proform® carb main body, and one pull was made with each of the three variations of Proform 1-inch phenolic spacers supplied in their Trackside Carb Spacer kit.
The wide open spacer proved to be the most efficient for this engine, producing a whopping 244.62 rear wheel horsepower with 276.55 ft-lbs. of torque, equating to a 12% HP increase and , a 9% torque increase. That’s a gain of 26.5 horsepower and 23.58 ft-lbs. of torque with only a carb change and spacer install. We broke down the numbers for the spacer only, and this simple change resulted in an increase of 14 rear wheel horsepower and 9 ft-lbs. of torque. Incredible! and the 3-in-1 spacer kit is under $80. Now that’s a low cost power adder producing astounding results!
By simply changing the carb and adding the Proform 67160C spacer to this engine, we gained increased throttle response, realized the full power band of the engine, and at wide open throttle it felt like it would never stop pulling. That, coupled with the horsepower and torque increase, makes this combination a winner on street or strip.