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Post by 65442man on Jun 22, 2021 1:12:30 GMT -5
was wondering what cfm carbs does our stock 65 olds have, in the process of converting over to a Holley 4bbl, I'm thinking 750 cfm but I'm not sure what size to use, my motor is stock and not planning on drag racing it , just good every day cruiser, any help would be helpful
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Post by dads442 on Jun 22, 2021 10:42:21 GMT -5
If you go on line there are carburetor CFM calculators that you can use to help get a reasonable idea... most are, engine size (cubic inches) max RPM (4500 to 5000 if your feeling frisky) Volumetric Efficiency (most stock engines around .80 to .85%) divide by 3456
400x5000x.85=(____)div.3456=CFM
I used one like the above to get an Idea of what cfm to use for my 66 SS swap from original Q jet I'm sure others have used similar calculators or have other methods for figuring it out...good luck
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Post by island65cruiser on Aug 16, 2021 15:29:49 GMT -5
Just saw your post. Hope my info is not too late to help. I contacted Holley, gave them all the info on the car, Engine, trans, rear, and so forth, and they calculated 625 CFM for my car. They said the most common problem people have is too much carb. I ordered a 625 CFM Carb from their Refurb Shop, and they set it up for my car. They told me to just set the idle, and I would be good to go. I did that, and it runs great. Hope this helps.
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Post by wailinwayne on Aug 24, 2021 22:30:30 GMT -5
From the research I have done on the 1965 Olds 442 Rochester carb No. 7025150 { non air conditioned car )the cfm is 692. Hopefully this gives you a bench mark for comparison purposes.
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Post by jlrichcreek on Aug 25, 2021 14:49:35 GMT -5
I have a β68 SBO 350 in my β65. LT headers, Comp XE262 cam, SpeedPro .030β over pistons, mild ported #5 heads with large valves, and itβs topped with Holley 4160 600CFM. Engine very responsive and runs well. Only had to tweak primary squirter and jets to fine tune. So anything in the 575-650 range will works fine for you application.
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