iron intake or performer for best MPG - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 03-29-2008, 12:13 PM

i have a 78 swb chevy sport van that im trying to squeeze every last MPG out of. it has a goodwrench 350 in it and i was wondering which intake yielded the best MPG. i saw a goodwrench 350 buildup on one of the chevy publications and they said that what the performer made in hp, it lost in tq. the iron intake is a pre-emission intake.

Longhorn Man · 03-29-2008, 01:42 PM

huck said he saw a drop in 2 MPG with the performer verses stock.
I saw a noticeable increase in torque (measured in finally being able to spin a tire) and also increased MPG, 1 to 2 MPG.
So it's a tough one to answer.

Slammed70 · 03-29-2008, 09:11 PM

Ita also a good 30lbs or more lighter too....less weight = motor working less to move all the weight = better gas MPG.

whatnow123 · 03-29-2008, 09:13 PM

Quote:

Originally Posted by Longhorn Man

huck said he saw a drop in 2 MPG with the performer verses stock.

My bet is becuase he couldn't keep his foot out of it.

Longhorn Man · 03-29-2008, 11:23 PM

no, huck was testing and tuning and trying everything to get that last MPG out of it. I found his discovery to be quite odd, but as far as I'm concerned, his word is gold.

**oldgold70c10** · 03-30-2008, 05:44 PM

I don't know what performer intake you are planning to use, but I choose a Wieand Stealth mated to an Edelbrock. So far, I have been getting a very consistant 18 mpg highway. You would think that the aftermarket intakes would give better milage, because the passages are better designed, but it may be that many people are running aftermarket carbs on the new intakes, and not q-jets!

67_C-30 · 03-30-2008, 07:04 PM

You must remember that aftermarket intakes have bigger runners which do use a little more fuel. The only way to test it would be to change just the intake. I've seen people take off iron intakes with an adapter plate for a Holley and seen an increase, but I've never seen someone leave the Q jet and and just change out intakes. I would think that with all things being the same, that the stock would be better due to the smaller runners.

*Billla* · 03-30-2008, 08:57 PM

2X; this is one of those situations where it's very hard to do an apples-to-apples comparison.

IMHO, I'd take the intake question out of the picture, put on a decent set of headers and pay for a good tune.

crm318 · 03-30-2008, 11:14 PM

all great info. thanks guys.

03-29-2008, 12:13 PM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	iron intake or performer for best MPG i have a 78 swb chevy sport van that im trying to squeeze every last MPG out of. it has a goodwrench 350 in it and i was wondering which intake yielded the best MPG. i saw a goodwrench 350 buildup on one of the chevy publications and they said that what the performer made in hp, it lost in tq. the iron intake is a pre-emission intake. __________________ 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

03-29-2008, 01:42 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: iron intake or performer for best MPG huck said he saw a drop in 2 MPG with the performer verses stock. I saw a noticeable increase in torque (measured in finally being able to spin a tire) and also increased MPG, 1 to 2 MPG. So it's a tough one to answer.

03-29-2008, 11:23 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: iron intake or performer for best MPG no, huck was testing and tuning and trying everything to get that last MPG out of it. I found his discovery to be quite odd, but as far as I'm concerned, his word is gold.

03-30-2008, 05:44 PM	#6
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,025	Re: iron intake or performer for best MPG I don't know what performer intake you are planning to use, but I choose a Wieand Stealth mated to an Edelbrock. So far, I have been getting a very consistant 18 mpg highway. You would think that the aftermarket intakes would give better milage, because the passages are better designed, but it may be that many people are running aftermarket carbs on the new intakes, and not q-jets! __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

03-30-2008, 07:04 PM	#7
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: iron intake or performer for best MPG You must remember that aftermarket intakes have bigger runners which do use a little more fuel. The only way to test it would be to change just the intake. I've seen people take off iron intakes with an adapter plate for a Holley and seen an increase, but I've never seen someone leave the Q jet and and just change out intakes. I would think that with all things being the same, that the stock would be better due to the smaller runners. __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 03-30-2008 at 07:04 PM.

03-30-2008, 08:57 PM	#8
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,814	Re: iron intake or performer for best MPG 2X; this is one of those situations where it's very hard to do an apples-to-apples comparison. IMHO, I'd take the intake question out of the picture, put on a decent set of headers and pay for a good tune.

03-30-2008, 11:14 PM	#9
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: iron intake or performer for best MPG all great info. thanks guys. __________________ 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

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