carb size
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Senior User
Joined: Jun 2006
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From: peterborough ontario
carb size
hey guys what size card should i put on my 390 its got a edilbrock highrise intake ?? its got a 650 holly on there it runs ok but would i get more jam out of it with a biger carb
Senior User
Joined: May 2010
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I'm running a 800 cfm qjet on my 390 and love it... The rochester quadrajet is a varible cfm carb and will only flow what the engine requires. Gm used them on engines from the 305 all the way up... Ford even used them in '70 and '71 on the 429... The qjet's small primaries are more than enough for daily street driving with great economy + the added bonus of the huge secondaries for those times you want to have some fun.. To set it up right, check out - Cliffs High Performance Quadrajets :: Qjet Carburetor Rebuild Kits, Parts, Bushing Kits, Carb Tuning - buy the book, and read it twice.....
I did use a Edelbrock #1483 ford kick down linkage adapter to make the carb work on my automatic application or you may use a lokar kickdown cable kit. I also used a 4 hole adapter plate Trans-Dapt 2034 flipped over and modified slightly to fit.....
Whatever you end up running, get a vacuum gauge and dial it in for highest vacuum for the best <nobr style="color: darkblue; font-weight: bold; font-family: verdana,geneva,lucida,'lucida grande',arial,helvetica,sans-serif;" id="itxt_nobr_20_0">performance
</nobr> and economy... How to Use and Interpret a Vacuum Gauge... Then, just enjoy the ride....
Post Fiend
Joined: Aug 2008
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From: Sin City
Unless you are turning major RPM's you have enough carb. This might help.
Holley Performance Technical Service Department
Holley Performance Technical Service Department
Junior User
Joined: Jul 2010
Posts: 80
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Rockstone's right.
Rockstone is right. A 600 is enough carb for a 390. You won't get anymore juice with a bigger carb, just worse fuel milage. Are you still running the stock exhaust manifolds? If so, get headers to gain more power. The stock manifolds don't flow well at all.
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