SoCal Jet Boats
Classifieds => Miscellaneous / Spam => Topic started by: muffbro on October 31, 2013, 04:47:30 PM
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my 15 year old son and I are re- building a 1979
Chevy PU for his first vehicle. we swapped the old 6 banger for a 305....
it needs a carb, any suggestions.....???
phone
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Are u in CA? Only reason I ask is for smog issues... Fuel mileage and performance wise , the OE quadrajets were actually pretty good carbs. If not a 600cfm edelbrock would be perfect, I run one on a 305 in my 72 blazer.
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id slap an edelbrock performer 500 on it and be done. CFM wise on a 305 with a generous 85% VE and a 5k rpm max range puts you under 500.
plus edelbrocks site says "500 for a small v8 like a 305" it wont cost an arm and a leg either like a holley/demon.
http://www.edelbrock.com/automotive_new/mc/carbs_acc/performer.shtml (http://www.edelbrock.com/automotive_new/mc/carbs_acc/performer.shtml)
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not in California so no smog issues ..... it's not a real hot rod, headers/flow master exhaust....the engine is stock.
I'll
check the on the Edelbrock.....it's got the QJ on it now, but I have zero knowledge base for that particular carb.....
phone
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I am a fan of the Q-jet carbs. It's likely going to give you the best cruising mileage and decent performance under full throttle conditions. A common problem with many of the Rochester carbs was wear in the throttle shaft/bast plate causing vacuum leaks. If everything feels tight and there aren't any other issues with the carb you have, I'd suggest having it rebuilt by a qualified shop or look into the new ones available from Edelbrock.
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after looking at pricing on the edlebrock my son has decided the re- build option on the QJ is looking better and better ( though not as shiny and pretty)
he's gonna pull it this weekend and take it to a local engine wizard and let him decide if it's rebuildable.... if not, we'll be looking for another QJ to replace it.
thanks guys!!!!
phone
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I have a edelbrock 750 with electric choke I need to get rid of.
RoB~SoCalJetBoats~
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I have a edelbrock 750 with electric choke I need to get rid of.
RoB~SoCalJetBoats~
I appreciate the offer, but a 750 is too much for for the 305.....
phone
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I appreciate the offer, but a 750 is too much for for the 305.....
phone
. No problem.
RoB~SoCalJetBoats~
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500cfm will be great for a 302 any more and you will over carb bad, since you said it has a QJ I say keep it. If you were running a 2bbl intake I would suggest a 500cfm Holley , my old 318 dodge truck with headers and cam liked the 2bbl Holley combo over a edelbrock torquer and QJ combo. I did have a np435 with the granny 6.69:1 1st and a 4.11 posi rear so truck loved 1000-3000rpm range.
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Damn...
I just sold a 600 cfm TBI system that would have been the bomb diggity.
I would totally keep the Q-jet. You can squeak some silly mileage out of one of those with a little knowhow.
Under the carb top near the rear there is a really small spring with an adjustment screw that controls ths secondary air door, this has a spec and should be adjusted before putting on the truck. If you adjust it a tiny but tight than the instructions tell you, it will hold out the secondaries a little longer than normal. I drove a 1976 LS7 powered 3/4 ton 4x4, lifted with 38" Swampers back and fourth from Gilroy to Sacramento for almost 5 months for a job. The stupid thing thought it was a Toyota. I got 18mpg out of it.
GT
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it's an old forest dept Trk .... 4 spd floor model with the the granny low. .....we are pulling the old rear end gears and have a locker' with taller gears than what's in it now to help the mileage,
than coupled with a carb update/rebuild I'm hoping for much lower rpm/ higher mpg.... if I can't get it with that, a tranny swap will
be next....
phone