I found a q-jet for a buick from -66 but I'm not entirely sure It's for the nailhead. It is listed as a replacement carb for Buick 1966 400 engine with air interjection reactor with no 7041309. I know the nailhead 401 is somtimes called 400. Does anybody know if this is for the nailhead or the 400 buick engine (which I thought was intruduced in 67) or the 401 nailhead? What is air interjection reactor?
Yes, that is the service replacement carb for a 1966 400/401 ...for use with the smog pump. Buick called the '66 401 a 400 when it was installed in the Skylark GS. Even the Buick parts book has them listed that way. Ask the seller if he has a 7041304....that's the carb for use on the '66 400/401 and 425, without the smog pump. I bought one several months ago....probably from the same seller! :bglasses: Last price I saw was $269. Good deal. The 'service replacement' carbs do have a few minor differences from the originals.... like the fuel inlet looks a bit different, but works the same.
QJ's rule! Huh?! o No: Outdated? When rebuilt and tuned right, they will be an all around better carb than the Holley. You just need to know what to do and not do. Besides the fact you'll use much less fuel and have power that is almost on par. QJ's rule! especially for a street car. If you're talking the Edelbrock QJ, they are just a copy of the original Rochester QJ. And if you're talking the AFB Edelbrock, well they are just plain crap! You can get them to run the right A/F mixture at idle, at cruise throttle or at WOT...problem is they won't tune to all three areas no matter what you do. Get 'em right at idle and they're too rich or lean at cruise throttle or WOT, get 'em right at WOT and they're too rich or lean at idle and cruise. Oh well, I guess you know where I stand on this....... :Brow: Dave
Almost on par You said it all! almost on par. uzzled: Im not trying to be difficult, just honest. For one, who needs fuel economy on a hot rod? Like i said Rochester,s are great for daily drivers-they sound cool too! But for all out performance the Holley is the way to go. You will not find Q-jets on drag cars other than the ones that the rules require them. It is very hard to set them up for a car that is modified-very time consuming, unless you want to pay someone for a custom one. o No: I have always had Holley's, street, and drag use, and very little time to set them up. If you want economy use a vac. secondary model. Rick.... :3gears:
QJ vs. 4781 I'm trying to be honest too :grin: My street car, 70 Stage 1, 118 cam, B4B, KB headers, SP 400, 9.25 CR, 3.91 gears. 11.70 at 115 and change with #4781 maybe 10 - 12 mpg on a good day. 11.73 at 115 with 72 QJ and 16 mpg on a good day. Pretty close performance-wise, not close economy-wise. And with fuel at $3 per...... that can leave some extra coin for mods or dinner with the wife :TU: Which makes it well worth it :laugh: I was referring to a real street car that puts a lot of miles on every year, which is how I drove my car. The extra mpg adds up over time. And the QJ mods were all done in house. Plus I almost wore it as a badge to run fender to fender and then lift the hood and see a stock appearing QJ on top. Can't dispute that Holleys are great carbs, in fact I'm running a 9375 Dom. now, but for a nailhead streetcar which is what this thread started as, the QJ is a simple bolt on with the 66 manifold. Will a Holley even bolt up to the earlier AFB iron manifold? uzzled: Dave
