Quadrajet ??s

[Baldy]

Well, I'm in the process of swapping out my Motorcraft 4350 carb to a quadrajet. Already have the adapter and carb, now just need a rebuild kit. I've been told to lower the float...how much?Anyone know what jetting I should go with? I'm at 3500' and it's going on a stock 360 with dual 2.25" exhaust, K&N, and TFI, if that makes any difference. It's mostly an offroad toy, but I like to drive it around town just for kicks... Thanks in advance. smile.gif

[ March 07, 2003, 03:52 PM: Message edited by: Baldy ]

[davez26]

I'm not sure why you would want to lower it from stock. I raised mine. I set my level as per the spec's for that model # carb, then drove it on our Land Rover test track, with the big uphill, and it conked out before I had the nose very high, which I thought was weird. I took it home and pulled the carb and filled the bowl and tilted it back. As the carb tilts backward, the fuel pools toward the back and uncovers the jets. By raising the float, the amount of fuel in the bowl is higher @ any one time and allows more tilt before uncovering the jets, and killing the motor. The truck ran good with a stock float level and the raised level. Mileage has never been great, so I can't say if that changed any.

[dublt]

If yer serious about the Q-jet, buy HPBOOKS ROCHESTER CARBS by Doug Roe. You don'tneed to lower the float level to compensate for angles like is done for Holleys. As for picking the "right" jets, it's not that easy. There's an infnite combination where jets and primary metering rods are concerned. Try finding a Q-jet off an early to mid 70's GM w/a 400ci engine, install, and check vitals like fuel cosumption and spark plug readings. The real fun comes when playing with the secondary metering system :D

[ March 07, 2003, 08:32 PM: Message edited by: dublt ]

[Baldy]

Thanks guys. I've been searching google all day for Qjet links...lots of info to digest. :cool:

[Don S]

..
Baldy...
... Try this link out. hope it is the right one...

http://autorepair.about.com/gi/dynamic/offsite.htm?site=http%3A%2F%2Fkarlmonster.tripod.c om%2FRochcarbs%2Findex.html ROCHESTER Q-JETs

Good Luck http://www.michiganjeepers.com/forums/images/graemlins/wave.gif and CUL ;) … ds..

[Tad]

Link is a bit slow to load but was very helpful for me...
http://vetteworks.tripod.com/Qjet.htm

[heydave]

I was trying to find a link I had somewhere but Tad beat me to it. PS I love my Q-jet! They take a little while to get fine-tuned but are great when you get done.

[dublt]

Heydave, theyr beyond GREAT!

[Crazy_Jeepman]

Originally posted by dublt:
Heydave, theyr beyond GREAT!I hope so!!! I am going to try one on my Caddy 500. I have a book by, Doc Frohmader, Big Inch Cadillac. He has a real good Q-Jet section in this book. I might even be able to follow the instructions on power tricks and general rebuild tech. :rolleyes: If not they sell Edelbrock Performers everyday, and right next door to me!! :D :D

[Serious Johnson]

Q'Jets are great once set-up, but a pain in ye olde arse to pull apart and twiddle on in the field because of fiddly gasket/ linkage/ metering rod relationships. I prefer something like a modified Holley for it's quick tuneability, even if it gives away some driveability. It's the only carb I know of that makes it easy-ish to stop & hot-swap jets for the last 3,000 ft of elevation gain up my driveway.

Gawd, I REALLY need FI!

:-