factory intake or edel. performer for MPG - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 09-26-2007, 03:16 PM

i will soon be putting a summit cam (.420/.442) and intake on goodwrench 350 i have. the engine will be going into a 78 swb chevy sport van with 2.73 gears. the engine will be built for good gas milage. what intake would be better for the job: cast iron (non EGR) factory 4bbl intake or a edlebrock performer. other that weight difference which is better? ive seen crate 350 buildups and they say that the iron one makes more low end torque and the perfomer makes more hp. granted this motor will be cruising the highway at 2000rpms, which is better for milage?

Ackattack · 09-26-2007, 03:23 PM

I don't think it will mater. There's advantages to each, but I don't think either will have a difference in mileage.

Huck · 09-26-2007, 04:58 PM

I have tried 3 different aftermarket aluminum intake manifolds on SBC with a drop in torque and a loss of 2mpg typical. I reverted back to a stock intake (either steel or aluminum) with a converter carb spacer then an edelbrock 1406 carb. That has been the best setup for toque and MPG. I also tried a set of hooker headers and also saw an immediate loss in low end torque and a loss of MPG---went back to stock exhaust and regained the mpg and torque. Trucks like low end torque and are usually geared too low for high rpm benefit. I would opt for 307 or 340-350 gear ratio for best results.

Scott68-93-97 · 09-26-2007, 05:13 PM

I dont know how it is in texas but in cali theres hundreds of stock aluminum manifolds at the junkyards that what I would use for best economy and to save a little weight, I used the same cam your gonna use on my 305 in my malibu before I swapped out to a 350 with the edelbrock performer manifold and I actually gained low end torque, and mpg that car also had 2.73 gears ran great as a low rpm cruiser.

BCOWANWHEELS · 09-26-2007, 08:56 PM

I,D USE THE STOCK IRON Q-JET MANIFOLD.personally my 383 with 3.08 gears averages 17 mpg if i drive it nice.

**special-K** · 09-26-2007, 09:06 PM

Spread-bores(Q-jet)get best mileage and if you`re not going for high performance,real high,the stock intake will do best.You can spend $150 more on gas,too.

09-26-2007, 03:16 PM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	factory intake or edel. performer for MPG i will soon be putting a summit cam (.420/.442) and intake on goodwrench 350 i have. the engine will be going into a 78 swb chevy sport van with 2.73 gears. the engine will be built for good gas milage. what intake would be better for the job: cast iron (non EGR) factory 4bbl intake or a edlebrock performer. other that weight difference which is better? ive seen crate 350 buildups and they say that the iron one makes more low end torque and the perfomer makes more hp. granted this motor will be cruising the highway at 2000rpms, which is better for milage? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

09-26-2007, 03:23 PM	#2
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,524	Re: factory intake or edel. performer for MPG I don't think it will mater. There's advantages to each, but I don't think either will have a difference in mileage. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

09-26-2007, 04:58 PM	#3
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,261	Re: factory intake or edel. performer for MPG I have tried 3 different aftermarket aluminum intake manifolds on SBC with a drop in torque and a loss of 2mpg typical. I reverted back to a stock intake (either steel or aluminum) with a converter carb spacer then an edelbrock 1406 carb. That has been the best setup for toque and MPG. I also tried a set of hooker headers and also saw an immediate loss in low end torque and a loss of MPG---went back to stock exhaust and regained the mpg and torque. Trucks like low end torque and are usually geared too low for high rpm benefit. I would opt for 307 or 340-350 gear ratio for best results.

09-26-2007, 05:13 PM	#4
Scott68-93-97 Registered User Join Date: Jul 2006 Location: Fair Oaks, CA Posts: 475	Re: factory intake or edel. performer for MPG I dont know how it is in texas but in cali theres hundreds of stock aluminum manifolds at the junkyards that what I would use for best economy and to save a little weight, I used the same cam your gonna use on my 305 in my malibu before I swapped out to a 350 with the edelbrock performer manifold and I actually gained low end torque, and mpg that car also had 2.73 gears ran great as a low rpm cruiser. __________________ 1968 Short Fleet 350/700r4 http://67-72chevytrucks.com/vboard/s...d.php?t=249435 1997 Bagged XtdCab Vortec350/4L60e http://67-72chevytrucks.com/vboard/s...44#post2286144 1993 XtdCab Longbed 4x4 6.5Turbo/NV4500 "Daily Driver" 1985 Toyota XtdCab 4x4 22re/W-56/Dual T-cases, Doug Thorley Header, Homebrew front and rear spring packs, Tons of Mods to suspension and drivetrain, 35" boggers, coming soon ARB's and 5.29's, Possible 4.3/700r4 swap

09-26-2007, 08:56 PM	#5
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: factory intake or edel. performer for MPG I,D USE THE STOCK IRON Q-JET MANIFOLD.personally my 383 with 3.08 gears averages 17 mpg if i drive it nice. __________________ I BELIEVE IN JOHN 3:16

09-26-2007, 09:06 PM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: factory intake or edel. performer for MPG Spread-bores(Q-jet)get best mileage and if you`re not going for high performance,real high,the stock intake will do best.You can spend $150 more on gas,too. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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