Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
17059272 modifications
ejowrench:
Marx3, Thank you for the cam specs. This cam is very close to stock. [as you already know].
I believe Cliff said in his book, something like- if you install your a carb on a performance [modified] engine and you believe you will need to make changes for optimal performance, 99% of the time, you will be correct.
'Pre-jetted' carbs may get you in the ballpark, but dialing it in after running it will get you inside the diamond!
Being your friends Big block is pretty close to stock, and he is used to a 'universal performance carb', perhaps he will be happy with it as is. Good luck and keep us updated.
ejowrench:
When I said 'as is', I meant as with YOUR prepped Q-jet, not 'as is' with the aftermarket carb. Just wanted to clarify that. I'm sure your Q-jet will perform better.
Marx3:
--- Quote ---Marx3, Thank you for the cam specs. This cam is very close to stock. [as you already know].
--- End quote ---
Yeah, it felt pretty stock too, which would be plenty to hurl a tiny Nova down the quartermile :-).
--- Quote ---I believe Cliff said in his book, something like- if you install your a carb on a performance [modified] engine and you believe you will need to make changes for optimal performance, 99% of the time, you will be correct.
--- End quote ---
Hehe, you gotta love that sentence !
--- Quote ---'Pre-jetted' carbs may get you in the ballpark, but dialing it in after running it will get you inside the diamond!
Being your friends Big block is pretty close to stock, and he is used to a 'universal performance carb', perhaps he will be happy with it as is. Good luck and keep us updated.
--- End quote ---
I am positive it will be a huge improvement! I will keep you posted!
Actually I built an 800 cfm unit for a pretty serious Buick owner for his 70 GS .60 over, Hemi-killer cam etc that he wanted to appear stock long ago, and he has just recently out it on so I can swing by him and make the final afr tuning.. He was using an 850 Holley DP which the engine was dynoed with ( can t remember the exact numbers, but plenty of HP an alot of TQ ) The Holley was doing good. He put the ball-park Qjet on yesterday and took it for a quick testdrive. He calles to tell me how amazing the throttle response was. It made the car feel like a much better driving car just because og the Qjet. It had a slight stumble when going from cruise to wot, but I found that he had not connected the pull-off yet... :-) The Qjet was doing 10 times better than the Holley even without the pull-off :-) I love
ejowrench:
As I say all the time to my friends who read Hot Rod: Holley is for racing, Q-Jets are for street! After many years of a Holley carb on my daily driven Chevelle and now a Monte Carlo, a modified Q-jet now resides for good.
Marx3:
The car in question has been raced, and I intend to do modified rebuilds for more serious streetcars, like sub-14 second cars. I would like too at least :-)
Uhh, a monte Carlo, what year? I've had a '75 and a '76 :-) I love the lines of the 73-77.
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