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#1 |
Registered User
Join Date: Feb 2009
Location: indian trail, nc
Posts: 192
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Carb advise
I've got a 250 inline six from a 1970 Nova in my '63 stepside. I'm getting ready to install a Clifford water cooled intake manifold with a matching set of street headers. I'm replacing the old single barrel with a Holley 2 barrel. Is there a huge difference between the 350 cfm and the 500 cfm? At this point I care more about gas mileage than torque or horsepower. Will the 500cfm be a waste on the factory cam or just too much for my engine? Need advice quick.
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ABOZ |
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#2 |
"Where were you in '62?"
![]() Join Date: Jul 2004
Location: Cleveland County, North Cackalacky
Posts: 5,013
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Hey bud,
I called my dad and told him you may call. If you need an answer quick! He said he can help ya. I'm not up to date on 6 bangers. We have that one out of that 73 Nova in the shop, but is stock. If you do find out let me know. I think it may be a little to much if ya wanna get fuel milage. Thanks Bud, I like to hear it with the new headers. What kinda headers are they?
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PROJECT: "FULL METAL YELLOW JACKET" 1962 Chevy C-10 Stepside Shortbed Nostalgia Pro/Street Pickup Truck PROJECT: "FULL METAL YELLOW JACKET Build Thread What Are You Workin' On? - 1Bad62ChevyPickup PROJECT: "TYRANNORAMBLER REX" 1969 AMC Rambler American Nostalgia Pro/Street Youtube Channel: Father Son Projects Youtube Channel: 2TIMOTHY2FITHTEEN ![]() ![]() ![]() ![]() ![]() ![]() ![]() "North and South Carolina Folks Click Here!" (((( ~ I have Parts For Sale & Miscellaneous Stuff ~ )))) "Well being as there's no other place around the place, I reckon this must be the place, I reckon...Nyuk Nyuk Nyuk" -Curly Howard Ph.D. |
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#3 |
Registered User
![]() Join Date: Oct 2006
Location: San Jose NOR*CAL
Posts: 3,080
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Re: Carb advise
I am running a 2 BBL HOLLEY 350CFM
it came off of a ford van works great. I would love a 390cfm 4bbl holley but can not adfford one
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1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... " |
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#4 |
"Where were you in '62?"
![]() Join Date: Jul 2004
Location: Cleveland County, North Cackalacky
Posts: 5,013
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Re: Carb advise
So you can run a 4 barrel on a 6 cylinder? I have seen a dodge swinger with a slant 6 with one on itan but it was built for drag racing. Man that car would run! Sounded wicked too!
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PROJECT: "FULL METAL YELLOW JACKET" 1962 Chevy C-10 Stepside Shortbed Nostalgia Pro/Street Pickup Truck PROJECT: "FULL METAL YELLOW JACKET Build Thread What Are You Workin' On? - 1Bad62ChevyPickup PROJECT: "TYRANNORAMBLER REX" 1969 AMC Rambler American Nostalgia Pro/Street Youtube Channel: Father Son Projects Youtube Channel: 2TIMOTHY2FITHTEEN ![]() ![]() ![]() ![]() ![]() ![]() ![]() "North and South Carolina Folks Click Here!" (((( ~ I have Parts For Sale & Miscellaneous Stuff ~ )))) "Well being as there's no other place around the place, I reckon this must be the place, I reckon...Nyuk Nyuk Nyuk" -Curly Howard Ph.D. |
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#5 |
Just here to tinker
![]() Join Date: Jun 2008
Location: Holland, MI
Posts: 3,692
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Re: Carb advise
Here is a good formula for figuring out what CFM your carb should be:
Cubic inch Displacement X Max RPM ---------------------------------------------- = CFM (3456)
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#6 |
Registered User
![]() Join Date: Sep 2006
Location: Las Vegas, NV
Posts: 169
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Re: Carb advise
If it is a progressive 2 barrel then that will give you better mileage over the single barrel or anything else because the primary barrel is smaller, (as long as you keep your foot out of it). But having the secondary is nice for passing and pulling hills.
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