I bought one of these on ebay and it needs to be rebuilt. I got sick of the edelbrock headaches, and was wondering if this could be rebuilt to be used on my 455, thanks for the help!:TU:
Don't waste your time. That number comes up as a carb for a 1968 Buick 350. It won't be calibrated anywhere close to what a 455 would need. Best carb for you to get would be a 7042240, which is a '72 455 800 cfm carb. :TU:
Its calibrated for a 350 currently. So in its stock form it will not be sufficient for your 455. However it can be easily recalibrated to work on the 455. If you didnt want to recalibrate a Qjet then a 1971-74 800cfm unit #704X240 would be an appropriate choice in stock form.
it would need idle air bypass added to it, bigger jets and rods, secondary rods, and some airbleed and idle circuit changes. Any reputable Qjet guy can do it, though you might be better served going with a 455 Quadrajet in stock form. check out my website at www.everyday-performance.com. I would be glad to help you out with an appropriate 455 Quadrajet or with a recalibration of yours. Shoot me an email at ken@everyday-performance.com if you like.
Ken does good work, so talk to him. There is some improvements made to the early 70 carbs from the late 60's as well. Good luck. Smart move going to the Qjet and tossing the Ebrock.
When I got my Riviera from the original owner, the carb on it was incorrect for the 430 Wildcat engine. It was a 7027146, which is the carb for a Buick 400, not a 430. Surprisingly, it actually ran pretty well, until the float bowl started leaking. I got a factory-correct 7027241 carb core, had it professionally rebuilt, and while it was pretty, it also leaked & had poor performance. I recently decided to cannibalize the 7027146 for parts, and noticed that the baseplate was brand-new...but no bushings around the primary throttle shaft. Already, the aluminum was wearing away and causing a vacuum leak. The 7027241 carb which the rebuilder made into a Rembrandt *did* have the primary bushings (on all 3 holes of the baseplate!), but never ran all that great. I'm cannibalizing this one as well for the baseplate & choke linkage, and assembling two later '67 7027248 carbs, so that I'll have 4 fully assembled and operational carbs for my '67 CA-emission 430 Wildcat. Sometimes, new rods & jets can improve the fuel delivery for a bigger CID, but it's best to just get the correct casting for your block.
I would tend to think if you build one fresh just right it should last quite a long time.. Save the others for cores as I would tend to think gaskets, ect... will just deteriorate over time on the shelf... Save your money for new kits when you need to refresshen next time as who knows what upgrades to the materials will have been made when were all running e-85... I've had great success with Cliffs Ruggels kits... Obviously only an opinion... lol.... It's your time and $$$
I'm just building the carbs so that I'll have multiple units to try out different fuel metering combinations. The carb swap takes about 10 minutes.
