Engine Tuning

[gildardo01]

What is your initial timing?  Quadrajet gets pretty good mileage because of the small primaries.

i agree... and then they have the huge secondaries... ready for when ever you need them... but to take advantage of the benefits of the quadrajet you have to drive with out stomping on the throttle at every stop sign and red light...

[hondarider188]

I would like to get around 15mpg on average if i can(but probably not) and im also looking at switching over to the 700r4 instead of the 350 so the overdrive will also help out if i get it done. and my timing is a touch advanced but its running good and strong so i dont really feel i need to mess with it. and where do i get a good quardrajet i thought that was the brand but i've been seeing summit versions and Q-jet brand but does it matter even. and what size would you guys recommend i was thinking maybe a 600cfm, but idk im just guessing.

[travisr1988]

quadrajets are made by Rochester, they came in 750cfm and 800cfm. They are limited further by adjustments on the carb itself such as linkage to secondaries so they work well with an engine that only needs 600cfm. Go to the junkyard and get one from a chevy truck and rebuild it. Otherwise check local speed shops or jegs has them at http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?No=0&Nty=0&catalogId=10002&Ns=P_Price%7c0&Ntk=all&Ne=1+2+3+13+1147708+1147708+1500000&langId=-1&storeId=10001&N=4294966764&Ntt=quadrajet 

[Fairlane514]

You can also ck ebay, get one close to the year of your truck, and rebuild it. They tend to have loose front primary shafts, but you can get a bushing kit and avoid a vacuum leak.

[hondarider188]

yeah i have been looking at ebay and there are alot of people/stores offering fully rebuilt done carb for about $200 which beats jegs for the same carb. and i have a friend who might be able to sell me one, but idk how much yet and theirs a guy here in town who can do a full rebuild for $90 so if i can the carb cheap enough i might do that. and i have been noticing that their is a 1 stage and a 2 stage carb, what does that mean?

[Fairlane514]

Stage 1 and 2, refers to the "performance" level of the carburetor. For street use, I'm sure the stage 1 is fine.

[hondarider188]

ok thanks guys if found this one on ebay and its been completly rebuilt and is ready to go.http://www.ebay.com/itm/321077967971?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 so i think that this is the one i need but if i can find one at the junk yard and get a rebuild kit and be cheaper than ebay i might do that. and when i get the new carb can the air box off of my edlebrock work for now until i  get the one i want. its the high flow triangle foam type. i am a little bit nervous if i have to rebuild the new carb, i have done carbs before but just simple dirtbikes or boats not even familiar with a quardajet.

[hondarider188]

i forgot to ask in my last post on how would i go about setting the electric choke back since mine was converted to a manual? thanks

[travisr1988]

I wouldn't use that air filter, just get a normal 14" from advance or grab a stock one from the junk yard. Those foam ones are junk. I just bought a timing light and did a tune on my truck, I'll have to wait and see what changes in gas mileage I'll get now, but my timing was roughly 6 degrees retarded and had poor idle quality, changed the vacuum advance to ported so it isn't pulling vacuum at idle, set initial at 10 degrees advance, total is at 33. Turns out I need a new distibutor. But it idles better now, seems to run better and smoother.

[Fairlane514]

You will need a hot wire in the key 'on" position to run to the eclectic choke.

[hondarider188]

well if you could can you explain to me how the electric choke works it will help me out alot. and what color would that hot wire you mentioned be? I found a green wire that probably about an 12 gauge or so and it runs right along the carb and then i found it just sittle behind the alternator, so could this be it? and should't my choke light come on when the electric choke is on also, because it lights up for a second when i shut off the engine. thats another thing that i would like to do also is get a new distributor cap and rotor, but i would like to get a nice air intake assembly instead of just throwing one on their for now and then having to buy another one also. so i think i will try to find one i like and order it with the carb.

[Fairlane514]

I am pretty sure the green wire you found will be the choke wire. If you have a test light (any auto parts store), turn the key to the "on" position and see if its hot. Also check with the key "off " to make sure its not hot then too.

[hondarider188]

ok thanks fairlane. and would you agree that this is the correct  carb that i need[urlhttp://www.ebay.com/itm/321077967971?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649][/url] the only reason that i ask is that their were two carbs on their the one is in the link above and the other it said that it fit all small block chevy's and i remeber thinking that their was something different that wouldn't work with mine, but idk. i just want to make sure before i order. thanks

[Fairlane514]

That one looks fine, should bolt right on, and that wire you found may just plug into the choke.

Some of the things I don't like about rebuilt ready to go is,.......... what kind of kit did they put in it, will it survive today's gas as far as float material and accelerator pump. Did they put bushings in the primary shaft to eliminate a possible vacuum leak. Did they check the air horn for warpage......if they give a you guarantee or trial period, then you may be fine.   

[hondarider188]

im not to worried if i remember right they have a 1 year warranty and if all else fails i can takeit and rebuild it myself.