Blazer finally on the road, going broke now - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Madbomber88 · 08-26-2004, 08:22 PM

I finally got my 71 CST K5 project on the road last weekend after 3 months of getting her roadworthy. This $1500 Ebay purchase now is mechanically sound ($4000 in new parts). Now it's time to turn my attention to the body and interior. I put a new Edelbrock Q-Jet 750 CFM carburetor with a new performer intake, heddman headers, and an edelbrock fuel pump all on the stock 350 motor. The thing runs like a champ, and is plenty powerful, but I cannot believe how much gas this thing uses. Is 750CFM too much? What would you recommend, and what will I sacrifice elsewhere to save some gas money? Also, my tank is only taking 13 gallons at the pump. Gauge is fine. Is this a stock tank??
Thanks guys
-Tim

moodyholler · 08-26-2004, 08:42 PM

My 72 holds 20 gallon and that does not get you far! I am running a 350 with Edelbrock 1406 (600 cfm) carb, holley intake, and hei. No headers yet or cam. TH350,np 203, and 3:07 gears. 14mpg last trip but around town is 9-10 mpg. Getting ready to try out a 700 R4 overdrive tranny and set of 3:73's or 4:10's. Enjoy,moodyholler

71jimmy · 08-26-2004, 09:35 PM

I'd go with Moodyholler and his 600cfm for a stock 350. A 650cfm would be max. Don't know if that would make a huge dif in mileage but from what I've read/heard that should be plenty for a stock 350.

71jimmy · 08-26-2004, 09:36 PM

Oh yeah, the stock Blazer tank should be 20 gallons.

bouncytruck · 08-27-2004, 10:47 AM

Sounds to me like fuel gage is probably off. My main tank is around 20 and my side tanks are around 13 each. Take a picture of the tank and we can probably tell you if it is the correct one. I haven't heard of an after market tank that is smaller than the stock ones.

Lets see picts of the rest of the truck!

Davy · 08-27-2004, 10:51 AM

Pics are a must.

Wish one of mine was road worthy right now.

Grim Reaper · 08-27-2004, 02:29 PM

If you keep your foot out of it the quad is the Key. If you motor needs a 550 cfm Carb then the quad is a 550. Quad can only supply as much as the motor can pull. It is self adjusting vacuum operated. It is far better off road then the Hogleys and that has been provem many times by the magazines.

Its a big heavy truck. 10mpg is about the norm. If your doing better your lucky or your odometer is off.

08-26-2004, 08:22 PM	#1
Madbomber88 Active Member Join Date: Mar 2004 Location: Virginia Posts: 169	Blazer finally on the road, going broke now I finally got my 71 CST K5 project on the road last weekend after 3 months of getting her roadworthy. This $1500 Ebay purchase now is mechanically sound ($4000 in new parts). Now it's time to turn my attention to the body and interior. I put a new Edelbrock Q-Jet 750 CFM carburetor with a new performer intake, heddman headers, and an edelbrock fuel pump all on the stock 350 motor. The thing runs like a champ, and is plenty powerful, but I cannot believe how much gas this thing uses. Is 750CFM too much? What would you recommend, and what will I sacrifice elsewhere to save some gas money? Also, my tank is only taking 13 gallons at the pump. Gauge is fine. Is this a stock tank?? Thanks guys -Tim Attached Images __________________ 71 Blazer CST 72 K20 Capt USAF

08-26-2004, 08:42 PM	#2
moodyholler Registered User Join Date: Dec 2003 Location: Roanoke,Virginia Posts: 179	Congrats!! My 72 holds 20 gallon and that does not get you far! I am running a 350 with Edelbrock 1406 (600 cfm) carb, holley intake, and hei. No headers yet or cam. TH350,np 203, and 3:07 gears. 14mpg last trip but around town is 9-10 mpg. Getting ready to try out a 700 R4 overdrive tranny and set of 3:73's or 4:10's. Enjoy,moodyholler __________________ 1998 WRANGLER I-6 auto 1972 LWB FLEETSIDE 1968 GMC SWB STEPSIDE 1994 C-1500 SWB 4.3 5 SPD

08-26-2004, 09:35 PM	#3
71jimmy Registered User Join Date: Mar 2004 Location: Sacramento, CA Posts: 1,084	I'd go with Moodyholler and his 600cfm for a stock 350. A 650cfm would be max. Don't know if that would make a huge dif in mileage but from what I've read/heard that should be plenty for a stock 350. __________________ '71 Jimmy, 350, SM465, NP205, 2in Tuff Country lift, 33s on rallies, TBI, softtop and hardtop "If life was fair you'd be able to afford one of each and a garage large enough to house them all."

08-26-2004, 09:36 PM	#4
71jimmy Registered User Join Date: Mar 2004 Location: Sacramento, CA Posts: 1,084	Oh yeah, the stock Blazer tank should be 20 gallons. __________________ '71 Jimmy, 350, SM465, NP205, 2in Tuff Country lift, 33s on rallies, TBI, softtop and hardtop "If life was fair you'd be able to afford one of each and a garage large enough to house them all."

08-27-2004, 10:47 AM	#5
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	Sounds to me like fuel gage is probably off. My main tank is around 20 and my side tanks are around 13 each. Take a picture of the tank and we can probably tell you if it is the correct one. I haven't heard of an after market tank that is smaller than the stock ones. Lets see picts of the rest of the truck! __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

08-27-2004, 10:51 AM	#6
Davy Registered User Join Date: Apr 2003 Location: Rice, Minnesota Posts: 370	Pics are a must. Wish one of mine was road worthy right now. __________________ 1970 Blazer CST Looking for NOS items for my CST restoration.

08-27-2004, 02:29 PM	#7
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	If you keep your foot out of it the quad is the Key. If you motor needs a 550 cfm Carb then the quad is a 550. Quad can only supply as much as the motor can pull. It is self adjusting vacuum operated. It is far better off road then the Hogleys and that has been provem many times by the magazines. Its a big heavy truck. 10mpg is about the norm. If your doing better your lucky or your odometer is off. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project



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