General Category > Quadrajet Carb Talk and Tips
Newly Built 383 Stroker w/Quadrajet
Cliff Ruggles:
I get more complaints here to the shop for "tight" lsa cams than any other.
The very worst are from the Thumper and Mutha-Thumper cams currently being sold. The Comp XE cams get the second most complaints.
I also tune for a living, and we've had scores of folks bring their vehicles up here to custom tune. I've not to date been the first bit impressed anyplace with those cams when it comes to engine power and vehicle performance.
They sure do sound like they are going to get it done, but don't make the grade. Matter of fact we've had quite a few customers remove them and make a better choice, after getting tired of dealing with the stinky exhaust, poor idle quality, and lackluster performance......FWIW...
ykf7b0:
I now have the engine in and the initial break in is complete. It will not idle on its on even with the accelerator idle adjustment all the way the in. Can I drill holes in the throttle blades with this 17056206 and rectify this problem? If not, how do I go about modifying idle fuel and bypass air? Thanks!
77cruiser:
First gotta ask how much initial timing do you have?
Frank400:
You don't need to drill holes in the throttle blades as the Quadrajet carbs have this nice feature called Idle air bypass which does the same thing.
So if you feel you would need to increase throttle opening for more idle air, just enlarge the holes you already have, which you can see on page 29 of Cliff's book.
ykf7b0:
I have the book and I am a bit unclear on this but if I can drill the holes in the butterfly's and get the same result as tearing the carb down and enlarging holes then why not just drill the butterfly's?
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