Carb question
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Freshman User
Joined: Nov 2000
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Carb question
First of all just wanted to say thanks to all you guys for your valuable input. This forum is the greatest! I do however have a question about carbs. I have a 302 with factory 2 barrel carb that is shot and I need to get an new one. Would a 4 barrel make a huge difference in the power of the truck? Reason being is that I have called around and can get a holley 4 barrel for around the same price as a stock 2. Also looked on holley's site and it shows a 600 cfm. Seems to me that is a little too much for that size engine but what do I know.
Thanks again.
Wade Haney
Thanks again.
Wade Haney
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Carb question
Have you checked with the guy's on the small block forum yet?
As Tim the Toolman Taylor said, " umh.MORE POWER ..."
Dennis
First Came the Chicken,
Then Came the Egg,
Or Was It the Other Way Around?
78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles
As Tim the Toolman Taylor said, " umh.MORE POWER ..."
Dennis
First Came the Chicken,
Then Came the Egg,
Or Was It the Other Way Around?
78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles
Senior User
Joined: Jun 2001
Posts: 480
Likes: 0
From: Alabama
Carb question
A carb & intake upgrade would make a noticable diff. in power.
Summit sells some decent packages, includes everything you need. And I would stick w/ a 600cfm vac. carb.
Chris
79 F-150 Lariat: Long-bed, 2wd, 460 (intake, headers, cam, early heads), C-6 (shift kit)
79 Mustang: 460 swap under way, balanced rotating assembly, forged pistons, truck rods, c-8 heads ported, Lunati solid lifter cam, more stuff...
98 Chevy Silverado ext. cab 4x4 (work truck)
95 Lexus SC300 (wife's baby)
Summit sells some decent packages, includes everything you need. And I would stick w/ a 600cfm vac. carb.
Chris
79 F-150 Lariat: Long-bed, 2wd, 460 (intake, headers, cam, early heads), C-6 (shift kit)
79 Mustang: 460 swap under way, balanced rotating assembly, forged pistons, truck rods, c-8 heads ported, Lunati solid lifter cam, more stuff...
98 Chevy Silverado ext. cab 4x4 (work truck)
95 Lexus SC300 (wife's baby)
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Carb question
The formula for figuring carb size is ci x max rpm then divide that # by 3456 = cfm at 85% eff.
Most stock or close to stock engines are about 85% efficient. That goes up with larger valves, ports, cams, etc.
302 x 5,200 = 1570400 / 3456 = 454.4 cfm
Most of the factory 2bbl Ford carbs are between 350 and 500 cfm.
a 600 with vac. secondarys if you use a Holley. I would recommend using an Edebrock Performer intake and a Performer 600 carb. I use the 750 Performer set on my 460 and it runs great!
Jimmy
Most stock or close to stock engines are about 85% efficient. That goes up with larger valves, ports, cams, etc.
302 x 5,200 = 1570400 / 3456 = 454.4 cfm
Most of the factory 2bbl Ford carbs are between 350 and 500 cfm.
a 600 with vac. secondarys if you use a Holley. I would recommend using an Edebrock Performer intake and a Performer 600 carb. I use the 750 Performer set on my 460 and it runs great!
Jimmy
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Posting Guru
Joined: Jul 2001
Posts: 1,613
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From: Gainesville, FL
Carb question
Chief,
It's a waste of time and money unless your going to build the rest of the motor. Your cam meters the amount of fuel/air through the motor. If you've got a factory cam you only need a factory carb. They are 500 CFM 2 barrel carbs that really kick butt. You could rebuild and rejet your carb for $20. You'll have no throttle response loss, no low end loss. The only place the factory 2-barel really comes up short is at about 85MPH. How often do you reach top end? I'll bet you drive about 35-45 MPH most of the time. I know I do.
Good Luck, Have Fun,
KingFisher
I drive my truck 99% of the time, I race that 1% and even that is a waste.
It's a waste of time and money unless your going to build the rest of the motor. Your cam meters the amount of fuel/air through the motor. If you've got a factory cam you only need a factory carb. They are 500 CFM 2 barrel carbs that really kick butt. You could rebuild and rejet your carb for $20. You'll have no throttle response loss, no low end loss. The only place the factory 2-barel really comes up short is at about 85MPH. How often do you reach top end? I'll bet you drive about 35-45 MPH most of the time. I know I do.
Good Luck, Have Fun,
KingFisher
I drive my truck 99% of the time, I race that 1% and even that is a waste.
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