Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Mods on a 7041262 for a RAIV 455 engine. Are they OK?
Cliff Ruggles:
Distributors are easy to modify, provided it's an OEM unit. No need to replace it otherwise as you can put any curve you want into any unit.
Low compression with a big cam likes more initial timing and quicker curve starting right off idle and all-in by 2800rpm's or so.
No need to look for another carb, then one you have will work once it's dialed in for what you are doing.....
MattK2:
I may know why it starts poorly when hot. The choke isn’t staying wide open, the choke rod is wrong. Just got it out of storage. It won’t come close to the index notches. I admit I never noticed them before as a way to calibrate the air. It was sold as a Pontiac part. The one with the hairpin bend in it. Old Service Manuals from 1970 show it with single kink. The Rochester parts diagram is the same. So all this time I’ve had a choke rod 1/2” too long. Cold starts should improve given improved full closure on a cold start. I’ve got the vacuum break at 0.330+/-. Now I just need to find the correct one and see if things greatly improve.
Still need to change out the rods, jets, and tubes too.
Cliff Ruggles:
I stock everything you would need including high performance quick release choke pull-offs, links, jets, metering rods and the correct power piston spring for the RAIV cammed 455......
MattK2:
I have new jets rods tubes and pull off I bought last year from you. Correction, not the “choke rod” ,but the “choke stove” rod. Sorry.
Since I’m mixing 68 intake with a 71/72 QJet. The choke stove rod is too long in this setup. Was the cam follower different pre1970? I have 70-74 Delco Bulletin for Pontiac carbs so I can see the stat/rod setup won’t attach to my intake, it’s rotated 90d.
Still researching old part numbers to see if I can find one that works.
Cliff Ruggles:
Pontiac used several different arrangements for the divorced choke carbs from 1967-72. They had three different choke pull-offs and several different fast idle cams. Mixing and matching parts typically doesn't work well.
I don't stock or sell the choke coil to carburetor links, only the choke pull-off to secondary airflap shaft links. So not sure where that came from or if it even the right part.
In any case they are easy to make from an aluminum TIG rod, much easier to bend and modify that steel rods.....
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version