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#1 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,119
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Headers
I am getting a little tired of 12mpg with my bb truck. Has anyone that has installed headers on their truck noticed any difference in mpg?
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Headers
headers only measurably help at higher RPMs. I've only known one guy to measure every drop of fuel into his truck, and document every mile driven... and his observations (small block truck) was that a stock intake and stock exhaust manifolds proved best for MPG.
12 MPG isn't too bad for a big block truck in all reality. You could try tuning it, and driving it a bit easier (that's the hard part) and you may get one or two more per mile. |
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#3 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: Headers
what rear ratio and size tires ?
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is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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#4 |
Registered User
Join Date: Feb 2009
Location: Southern Oregon
Posts: 1,352
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Re: Headers
12 mpg aint bad. Curious too as to what gears, tranny, and carb you are running. My 69 c10 with a stock 74 454, TH400, and 3.73's gets 9.5 on the highway and less in town.
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#5 |
Registered User
Join Date: Jun 2011
Location: GA
Posts: 281
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Re: Headers
A over drive transmission would be a big investment, but is also about the best thing you can do for MPG.
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#6 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,119
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Re: Headers
Thanks for the help. I am running a 396/350 horse with an Edelbrock 1406 carb and a TH400 with 3:73 gears and the tires are 255/70R15. The mpg figure was in Canadian gallons and with the US gallon being 20% smaller and a little recalculating I am getting 10.1 mpg from a US gallon as opposed to the 12mpg from a Canadian gallon. I guess the best solution would be to go to a 700R4 with 3:42 gears which would get the rpms down to 2100 at 70 mph instead of the 2800/3000 rpms at 70 mph I get now. If I did all that at lets say a cost of 3500/4000 with install and got 25% increase in gas mileage to 16 mpg, its not very cost effective on a truck I drive 1000/1500 miles per year. Why cant gas be a 1.00 a gallon ??????
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Headers
I assumed you had 3.07 gears with the big block.
something you can do fairly cheap, is swap the rearend with a 3.07 rear. Find one in a junk yard for a couple hundred, or someone parting one out. Another one, is drop the edelbrock and get a quadrajet. With the tiny primarys on them, they are great for MPG and throttle responce. |
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#8 |
Registered User
Join Date: Mar 2009
Location: independence mo
Posts: 2,111
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Re: Headers
If you only drive it 1500 miles a year, why do you even care about gas mileage.
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I'm not as good as I once was, But I'm as good once as I ever was. |
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#9 | |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,119
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Re: Headers
Quote:
Posted via Mobile Device
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#10 |
1969 Custom 30 wrecker
Join Date: Sep 2001
Location: Pottsville, Pa
Posts: 2,611
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Re: Headers
Join the club! I feel the same way.
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Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10 |
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#11 | |
Registered User
Join Date: May 2008
Location: Mesa, AZ
Posts: 281
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I own 3 classic vehicles. 1971 LWB C10 Deluxe. 1974 VW Super Beetle. 1971 VW Fastback. The C10 and the Super Beetle run, the Fastback is just not there yet! Please visit my Super Beetle and Fastback profile on TheSamba. |
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#12 |
Registered User
Join Date: Mar 2011
Location: Fort St John, BC
Posts: 85
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Re: Headers
I have a 3.07 rear for ya if you want to switch, hell I'll even drive the 2000km to swap
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69 c10 lwb |
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#13 |
Registered User
Join Date: Sep 2010
Location: Richmond IN
Posts: 50
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Re: Headers
Just wondering what gas prices are running up there in Canada.
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#14 |
Registered User
Join Date: Mar 2011
Location: Fort St John, BC
Posts: 85
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Re: Headers
1.20 to 1.30 per litre. so about 4.52 to 4.92 a USG
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69 c10 lwb |
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#15 |
Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: Headers
Wow....I'd LOVE to get 12mpg....my big block gets 9MPG.....Best I ever got out of it was 11mpg...must have had a tail wind!
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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#16 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,915
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Re: Headers
My Blazer running a 350/350 with 3.73:1 rear and 32 inch tires only gets 10-11 MPG. Of course, if I convert it to kilometers, that's 17.6 KPG. Hey, who knew the metric system could be such a psychological boost?
As for the headers, I've had engines with stock manifolds and with headers, and I don't think there's as much difference in performance or fuel mileage as people think, unless you're running a high-performance engine. I think having an overall free-flowing exhaust is more important than whether you have headers or manifolds. |
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#17 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: Headers
my truck gets gas station to gas station mileage
__________________
is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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#18 |
Registered User
Join Date: Jun 2011
Location: GA
Posts: 281
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Re: Headers
My buddy swears he gets 21 with his LS2/480le 3.55 combo...IDK
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#19 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Headers
and I used to get consitant 44 MPG delivering pizzas in a civic... still has nothing to do with a cost effective way to get a few more MPG on a truck that has a big block in it.
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#20 |
Registered User
Join Date: Aug 2008
Location: Red Deer ab canada
Posts: 1,250
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Re: Headers
I'm ASSuming you have dual buzzuast on your truck??
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1972 factory 2 Wheel Drive Blazer-Sold 1972 K10 4X4-Sold 1971 Chevrolet Cheyenne/10-Sold 1970 Chevrolet C/10-Sold 1968 GMC 4X4-Project 1968 Chevrolet C/10 Pro Street 1970 GMC 3/4 Ton-Parts 1997 2WD 2DR Yukon-Sweet http://67-72chevytrucks.com/vboard/s...d.php?t=335664 |
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