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#1 |
Senior Member
Join Date: Feb 2004
Location: Ponca city now kingfisher Oklahoma
Posts: 1,221
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I'm getting ready to swap out my 292 in for a 305 in my 67 C10. The 305 is out of a 80's camaro that was supposed to have been rebuilt. Which carb would be the best for MPG? I know the theory of 4bbl is that if you just put around in it the primaries are smaller than those on a 2bbl so you should get better mpg. But I've known some farmers who switched out to little 2bbls and claim they getter better mpg. I also have a 80's HO. aluminum intake. I think off a 305. So, I could use this and get a fresh quadrajet. I will plan on using an HEI of course too. I'd love to get 14-16mpg if at all possible. gas is going to be damn high this summer.
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#2 |
Registered User
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
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Why change the 292 those d#$% motors will run seemingly forever.
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1985 Chevrolet C-30 454 1-TON Dooley 1969 CHEVROLET CST-10 PICK-UP Good memories 1999 Chevrolet Z71 Ext. cab 5.7L Good Memories With a quart of oil, and a gallon of gas, she won't let no other car pass!!!. ![]() ![]() |
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#3 |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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I'd never swap a 292 for a V-8..............But I use a truck for work and I love an I-6.
I am putting in a Diesel before gas is $3 ![]() ![]()
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#4 |
Registered User
Join Date: Dec 2002
Location: Hills of Western Mass
Posts: 626
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I would also say that you are up for a potential dissapointment with the 305 over the 292. You will probably have about half the torque of the 292 with the 305 and in an old heavy truck you will know it.
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86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club! |
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#5 |
Registered User
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
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1985 Chevrolet C-30 454 1-TON Dooley 1969 CHEVROLET CST-10 PICK-UP Good memories 1999 Chevrolet Z71 Ext. cab 5.7L Good Memories With a quart of oil, and a gallon of gas, she won't let no other car pass!!!. ![]() ![]() |
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#6 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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I also agree with the 292 vs. 305 debate.
the 305 will work harder therefor reducing the MPG below that of the 292. I have a Cadillac 472 which when complete expect to get about 18 MPG. fuel mileage comes from the engine operating in the peak of the torque curve. it comes down to a measurement called volumetric efficiency. I used to have a BUILT 355 in a 80K20. it got between 16 & 18MPG @ 3100 RPM. (that was at about 1/2 inch of gas pedal)
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Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card |
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#7 |
Got Light Emitting Diode?
Join Date: Apr 2004
Location: Newberg, OR
Posts: 2,485
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if it was a 305 V6 i would disagree with these guys, its cool to be unique and you still have a butt load of torque
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's ![]() 1993 Cherokee work ride/weekend wheeler |
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#8 |
Out draggin'
Join Date: Jan 2004
Location: Pitman,NJ
Posts: 1,574
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Holley used to have a small 4 barrel carb called an "Econo-Master". I don't know if you can still get a new one but I would try one of them before I tried a Quadrajet. They have small primary's & secondary's.
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91 GMC Xcab LB-Bags/bd/caddy clip SOLD 72 C10 Cheyenne Super LWB SOLD 92 GMC K1500 Burb 72 C10 Burb (ex. Cheesewagon)SOLD 72 C20 Burb parts truck 71 C10 Burb "project" |
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#9 |
hmm...
Join Date: Jan 2004
Location: Culver, Indiana
Posts: 1,631
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just get a stock 750 cfm quadrajet off of any GM car that isn't on the computer, and be happy. with my 307, on the computer, I see 26 mpg with OD and 2.73's. Buddy of mine had a 307 in a 1973 omega (olds 307) with a quadrajet, headers and straight pipes, a TH350 and 3.08 peg legger in the back. He saw a best of 28 mpg on the highway, and averaged 15-18 mpg.
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1983 Oldsmobile Delta 88 1967 Chevy C-10 stripper www.fcrperformance.com - wanna go...faster? talk to FCR. |
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#10 |
FUJIMO
Join Date: Dec 2004
Location: South Dakota
Posts: 127
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I ran a 305 in my 70 for a few years, it had fair power and got around 17mpg. I ran headers, and an edelbrock 600 4bbl carb. It was no racer, but it was never shown up by a 6 cylinder, and it had pulled a trailer a few times with no problems.
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IF IT DON'T GO--CHROME IT!! I dont mind confusion, I create it! ![]() ![]() ![]() ![]() |
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#11 |
Senior Member
Join Date: Feb 2004
Location: Ponca city now kingfisher Oklahoma
Posts: 1,221
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#12 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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305 vs 292
Here's more than you ever wanted to know about the 305
http://www.goingfaster.com/spo/praisetbi.html http://www.goingfaster.com/spo/mods.html Vettevet
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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