Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

17059272 modifications

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ejowrench:
Marx 3,

Yeah, it's me again. Maybe someone out there has a better answer than me [no dought], just remember, there is no such thing as a 'pre jetted' carb. That's a marketing term to describe a carb that is too rich. I feel if you want your carb to run at it's best, you are going to have to get it running and spend some 'quality' time with it.

Marx3:
Hi again ejowrench, how have you been :-)

I realize this. I know I need to spend some time finetuning the afr, but like I said, my friend with the car lives far away, so I want the carb to be as close as possible...

a 9.4:1 454 with a pretty mild cam should be pretty easy to pre-jet since, well, since its a mild 454. There must be many other cases :-)

Maybe I misunderstood your first post, but you said you didnt know about camspecs, and it sounded like you had not read the whole post. I have built many carbs, and tuned many cars using my LM-2 portabble O2-meter.
My friend currently runs a stock 750 Edelbrock and it runs very lean at cruise an pretty lean at wot. He dont know the difference, so I want him to be positively surprised when he receives the Qjet. This is why I need this carb to be as close as possible. Pre-jettet if you will :-)

ejowrench:
Marx3: I re-read your original post. I'm not really sure what 288adv means. Is this the duration? If so, at what tappet lift is this measured at? There are many different ways to measure duration, but every cam manufacture has a spec for duration at .050'' tappet lift. That's what I look for. Advertised duration means absolutely nothing to me, it's just a number to reference a cam, sort of like a part #.

I'm just curious to know the cam specs at .050''. Maybe you still have the cam card?

Marx3:
288 advertised duration, 214 at .050...
Sorry I didn't put the duration at .050, I read somewhere in here that dur. at .050 was more or less useless information. Cliff wrote it if I remember correct.

Marx3:
btw, I came to wonder: if there is no such thing as a pre-jetted carb, what is Cliff's business all about then? :-) Again, dont mean to be rude or sassy :-)

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