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Carb Tuning and Gas Mileage...

8

85blaze

1/2 ton status
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Feb 20, 2000
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Location
Corning NY
How can get some better mileage by tuning up the carb? or any ways of better mileage? it has a 350 with holley 4bbl on it.. 700r4, 3.08, and 31" at's. It just kinda seems to lack powere and get bad mileage... no smoke.. once in a while it acts like it loads up and blows lots of black smoke when it idles to long. What can i do? Thanks

~Moshe

Finally done after 8 months.. Not really.. IM never going to be done. Stroker motor is next
 
REBUILD TIME! I'd just save the headaches and have it done by a professional. It'll only run about $100 to get it done and you can at least cut that out of the equation for problems for some time. You could do it yourself but I would get some practice on some old junkers before I messed with the good stuff.

Two lanes wide, twelve yards long, sixty-five tons of American pride....Canyanero!
 
Yep its rebuild time. It sounds like your power valve is bad. The power valve is located in the meetering body behind the float bowl. You can buy the power valve at most auto part stores. Be sure to replace it with the same number. Or to find the correct power valve for your engine. Hook up a vacume guage . Check vacume at idle. Divide reading on guage by 2. This is the number Hg power valve you need.
That is the bad thing about holleys. One good backfire through the carb and the power valve is shot. you can buy a little check valve to stop this from happening. But the best thing to do to get better gas mileage out of a Holley is to toss whole carb and replace it with with a Quad jet.
 
Yep, toss that Holley and install a Quadra-Jet. It will perform a miracle if you swap carbs.
 
Damn, somebody beat me to it. Round-file the Holley, throw on a Quadrajunk or EFI it.

Pete

'83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
'97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
 
I'd go with the quad too! I had a holley on a 69 corvette nothing but trouble,put q-jet back no troubles.
 
ditch the 3.08 gears... is way to hard to get going from a stop and then it lugs the motor most of the time anyways... getting so steeper gears should really help... 3.42's or 3.73's would be perfect

1987 Chevy K5 Blazer- 350 TBI
 
Get a Quad......

<A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
<font color=blue>Happy Trails
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<font color=blue>Wayne</font color=blue>
 
Where\'s a good place to get a quad?

Should i get a new one from like edelbrock? or ??? Thanks!

Finally done after 8 months.. Not really.. IM never going to be done. Stroker motor is next
 
Re: Where\'s a good place to get a quad?

Get the Edelbrock Quadrajet replacement.. 4 wheel and off road just did a shootout w/ all the latest carbs.. the edelbrock's quadrajet beat them all hands down...


Experience is something you don't get until just after you need it. <A target="_blank" HREF=http://www.rocko.coloradok5.com>http://www.rocko.coloradok5.com</A>
 
Re: Where\'s a good place to get a quad?

Anybody got a scanned copy or link to that article??

Dorian
My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
 
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