Im building up a new 350 right now for my car, and im on a budget. The guy whos helping me with my engine has a holley 700 double pumper thats been used by his step brother, but is rebuilt and in great shape that hes giving me for $75. I know the double pumper is going to be a gas hog, but how bad are we talking? Should i expect 8mpg, 10, 13, 15??? I dont know everything well be using yet, but most likely a performer rpm intake, sbc heads with 2.02/1.60 valves, and 60cc chambers. So compression will probably be high...like 11 something. And it will run on 92 gas. What do you guys think?

 

It will depend a lot on how you drive, what kind of heads you have (new good combustion chamber design or old and bad) How good is your ignition, headers, tranny, rear-end gear and a lot of little stuff. If it's jetted right expect about 14 on the highway, maybe 18 with overdrive and keeping it out of the secondaries. in town 10 to 12.

 

It also depends on the list number of the carb. A 700 cfm carb could get worse gas milage than a 850 depending on the particular model. Some are designed for street use while others were built strictly for the race track.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

First you need to get it running. 11 something compression on 92 gas won't work well. Then, it depends on how you drive it.


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro