Holley 1920 Floats
The 1920 carburetor used 2 different floats through the years and neither one is manufactured any more. We do find new floats from time to time so check our 1920 catalog. The 1920 float was a Nitrophyl float and over time these floats will absorb fuel and the only way to test your float is to weigh it. We have grouped the carburetor numbers below to each weight and they do differ quite a bit. Floats are weight in grams and since these are very hard to find, you can fudge to the upside 1 to 2 grams and then compensate by adjusting the float 1/32″ lower.
This group of carburetor numbers should weigh in at 7.5 grams.
R-3993-2A R-4405-1A R-4405A R-4487-1A R-4510A R-4542A R-4591-1A R-4591A R-8592A R-4594-1A R-4594-2A R-4595-1A R-4595-2A R-3993-1A R-3993A R-4405AAS R-4487A R-4510A R-7748A R-7864A R-4165AAS R-3228-3AAS R-3271-1A R-3397-1A R-3397A R-3924-1AAS R-3924-2A R-3924-2AAS R-3924AAS R-3982-1A R-3982-1AAS R-3982-2A R-3982A R-3982AAS R-3983-1A R-3983-1AAS R-3983A R-3983AAS R-3984-1A R-3984-1AAS R-3984-2A R-3984A R-3984AAS R-3985AAS R-4012AAS R-4013AAS R-4355AAS R-4356AAS R-4357AAS R-4358AAS R-4359AAS R-4362AAS R-4414-1AAS R-4414AAS R-4416AAS R-4655AAS R-4656AAS R-4659AAS R-4712-1AAA R-4751AAS R-4755AAS R-4756AAS R-6159A R-6202A R-6202AAS R-6876A R-7249A R-7250A R-7583A R-7584A R-7587A R-7747A R-7747AAA R-8213A R-8311A R-8388A R-8400A R-8401A R-8404A R-8405A R-8406A R-8407A R-6153AAS R-6154AAS R-6155AAS R-6156AAS R-6363AAS R-6364AAS R-6365AAS R-6366AAS R-6448AAS R-6595AAS R-6596AAS R-6756A R-7585A R-7585AAA R-7586A R-7586AAA R-4351A R-4351AAS R-4352A R-4352AAS R-4353A R-4353AAS R-4354A R-4354AAS R-4355A R-4356A R-4357A R-4358A R-4359A R-4361A R-4362A R-4363A R-4363AAS R-4641A R-4642A R-4655A R-4656A R-4657A R-4658A R-4659A R-4750A R-4751A R-4755A R-4756A R-6482AAA R-6483-1AAA R-6483AAA R-6153A R-6154-1A R-6154A R-6155A R-6156A R-6363A R-6364A R-6365A R-6366A R-4161-1A R-4161A R-4161AAS R-4162A R-4162AAS R-4163-1A R-4163A R-4163AAS R-4164A R-4164AAS R-4165A R-4192A R-4192AAS R-4193A R-4193AAS R-4194-1A R-4194A R-4194AAS R-4195A R-4195AAS R-2997A R-2998A R-2998AAS R-2999A R-3053-1AAS R-3053A R-3054A R-3057A R-3058A R-3059A R-3060A R-3152A R-3225AAS R-3226-1A R-3226-1AAS R-3226-2A R-3226-3AAS R-3226A R-3227-1A R-3227-1AAS R-3227-2A R-3227A R-3228-1A R-3228-1AAS R-3228-2A R-3228A R-3229-1A R-3229-1AAS R-3229-2A R-3229A R-3271-1AAS R-3271A R-3272-1A R-3272A R-3273-1A R-3273-1AAS R-3273-2A R-3273A R-3274-1A R-3274-1AAS R-3274-2A R-3274A R-3275-1A R-3275-1AAS R-3275A R-3276-1A R-3276A R-3277-1A R-3277-1AAS R-3277A R-3278-1A R-3278-1AAS R-3278A R-3279-1A R-3279-1AAS R-3279A R-3280-1A R-3280A R-3281-1A R-3281-1AAS R-3281A R-3282-1A R-3282-1AAS R-3282-2A R-3282A R-3398-1A R-3398-1AAS R-3398A R-3399-1A R-3399-1AAS R-3399A R-3446A R-3446AAS R-3671-1AAS R-3671A R-3671AAS R-3672-1AAS R-3672A R-3672AAS R-3673A R-3673AAS R-3674A R-3674AAS R-3919-1A R-3919-1AAS R-3919-2A R-3919-2AAS R-3919-3AAS R-3919A R-3920-1A R-3920-1AAS R-3920-2A R-3920-2AAS R-3920A R-3921-1A R-3921-1AAS R-3921-2A R-3921-2AAS R-3921-3AAS R-3921A R-3922-1A R-3922-1AAS R-3922-2A R-3922-2AAS R-3922A R-3924-1A R-3924A R-3985-1A R-3985-1AAS R-3985A R-4712AAA R-4712AAS R-6260-1AAA R-6260-2AAA R-6260AAA R-8403A R-6371A R-6371AAS R-6372A R-6372AAS R-6401A R-6401AAS R-6402A R-6402AAS R-6447A R-6448A R-6449A R-6450A R-6553A R-6554A R-6593A R-6594A R-6594AR R-6595A R-6596A R-7031AAA