Originally Posted by fred56
Just put my SBC together after having it apart checking for oil leaks and upon starting it up it came up with a really fast idle(about 2000 RPM). I had the carburetor apart putting on new gaskets and didn't notice anything funny.
I have checked the linkage(its free) and the throttle plates close all the way.
Even with the fast idle it really accelerates good(no hesitation).
What do you guys think? Vacuum leak? Carburetor cracked internally? It does seem to be running rich.
Thanks - Jerry
where the timing set at? a lot of timing can do the same thing. i can do the same thing on my inline if i want to... also, from the sound of it, it seems as though the cam may be quite advaced also., reason being, with a cam that is advanced, u can put a ton of timing in it and cant hardly get it to ping (i could put over 25* of ign timing in and it wont ping) and the reverse for retarding the cam..
if anything, make sure its not fuel delivery related 1st ( like maybe a bit of trash), then start digging around with the timing to get the idle straightened out. gl