what is the CFM of my Cutlass 2BBL?
August 5th, 2013 | 09:59 PM
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The small (1.25") bolt pattern 2G carb had a 1-5/32" venturi, a 1-7/16" throttle plate bore and was rated @ 280 cfm.
With the large base (1.50") 2 BBL carb, there are at least four different venturi diameters. They all have 1-11/16" throttle plate bores. They were used from the late 60's until about '79 on automotive applications.
1-3/16" venturi: 350 cfm
1-1/4" venturi: 380 cfm
1-5/16" venturi: 425 cfm
1-3/8" venturi: 435 cfm
With the large base (1.50") 2 BBL carb, there are at least four different venturi diameters. They all have 1-11/16" throttle plate bores. They were used from the late 60's until about '79 on automotive applications.
1-3/16" venturi: 350 cfm
1-1/4" venturi: 380 cfm
1-5/16" venturi: 425 cfm
1-3/8" venturi: 435 cfm
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