Trying to remember if it had the hot air choke housing on it, maybe it didn't. I believe it had 44K primary rods, 75 jets, mid letter hanger and the usual CV secondary rods. Being a Pontiac carb that isn't just a Canadian oddball, Cliff will probably know the specs like the back of his hand.
I agree. My 78 403 carb had 44K rods with 73 jets. I was quite surprised they were in there. Maybe someone swapped them in, who knows this being a swapped on carb. I wondered why it was blah on a stock 81 307, way too rich.
So mine was a 75/53S which is 2.211 thousandths of a square inch with the needle all the way down. For comparison, a 75/44 is 2.897 which is 31% more than mine. The 73/44 combo is 2.664 so mine must have been pretty damn lean. I jetted down to a 71/53 for altitude (1.768) and it's not happy with load on just the primaries which is odd because while I reduced the area by 20% with the rod all in, I only cut 12% with just the tip in.
Talked to Cliff this morning. The only part he might not have is a used Power piston, he has sold a lot as of late. He told me to cut the rod off mine Dualjet Power Piston, you can't pull it out. He said double check that pin height is the same as a Qjet. He even has extra linkage, the extra linkage I had is on the carb on my 88. He said to toss the rear pull off. They allow unfiltered air in the motor after the 40 year old filters disintegrate. He is going to drill out the idle tubes to .038", I still need open at the mixture screws and idle channel restrictions and is sending his .044" primary rods and suggested 73 jets to start, which I should have. Also he figured his DA secondary rods would also be close. He also is sending his pump rod with the clip and two sets of the metric idle mixture screws. He says they stick past the base so they are easily adjusted with a standard screw driver. He says this is a great starting point for a carb and figures the cam should be in the 230 duration range. I am also going to try and purchase the small chamber Procomp heads Cutlassefi is doing for 350 dyno motor. I am also willing to buy a set of Sanderson shorties and 2.5" and 3" down pipes with an O2 bung to dyno test against each other. I don't think anyone has ever dynoed them.
I checked my Credit Card to see if Cliff Ruggles took a payment. He did, two of them at $750 CAD! I called him, there is a reversal coming. He accidentally charged me for regular rebuild kit, not the high performance kit. I think he is just overwhelmed and probably needs to say I am done with the Rochester Qjet.
Ok, so looking over both carbs, I have decided to rebuild the 83 Canadian non CCC carb as it appears in better shape. It looks recently rebuilt with epoxy on the well plugs. Either one needs major idle and primary side recalibrations. Both throttle shafts showed slop. Cliff's instructions state the primary screws must be completely shaved down. I broke off screws on a Thermoquad not doing that, so heed Cliff's advice. One nice touch is the longer Metric slotted idle screws for 80 and up Qjets. Even fully seated, they sit flush with the base plate. I got the primary shaft out, definitely has wear. Next will be installing primary shaft throttle bushings per Cliff's instructions in his kit. FYI this 83 carb had 56P rods and 73 primary jets, very lean. I will probably use the 73 jets with Cliffs custom performance 44 rods as a base tune with a notched, easy adjustment APT set to the factory setting with a thread in plug in the air horn, which Cliff provides in his performance kit.
Okay, here is the rebuilding of the base plate. The stepped bit with the attachable collar makes drilling the correct depth easy. The hardest part is getting the bushings started straight. Red Loctite on the bushing and the screws for the primary throttle blades. Everything is now nice and tight without slop, phase one is complete. Next will be removing idle channel restrictions. Also a couple of pics of one of my 4 helpers, Dixie, the youngest Dachshund
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