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It all depends on your application. I have a 48 IDF on my half bridge 13B and it is almost too small. I have that carb maxed out for flow as far as adjustments go. I was considering going to either a 51 IDA or a dual 40 IDF setup of some sort.
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1976 Rx-4 hardtop. Half bridge 3B 13B, S5 NA rotors, Renesis e-shaft, stat gears, and bearings, balanced rotating assembly, RE dual weber 36 DCD's 203rwhp 137ft-lbs torque DGRR 2011 3rd place
1974 Rx-4 all original 27,000 miles
1988 Rx-7 TII 320rwhp. DGRR 2012 3rd place
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