[3rdgenmess]

I'm back again guys, 350 sbc high rise intake w/ a 1inch carb spacer...do you think the spacer could be the reason behind my embarrasing performace? car surges when I race the engine, I have a big shot gun intake w/ a hole cut in the hood...so do you think its running lean? I adjusted the air/fuel ratio and it seem to be running better but now it diesels (run on) after I turn the car off...I wanted to remove the spacer but my intake vacuum line is sitting so high that my carb won't mount w/ out it

[hauss667]

I may be way off base here but if its diesling wouldn't that be a timing issue?

[topwrench]

I dunno what you mean by "racing the engine" what rpm?
If u try to hold it steady at lets say 2500 what happens?
Run on can be caused by several things,so start here.
After u shut it off n it quits dieseling try to start it.
Does the starter labor n stop?
If so maybe timing too advanced.
Where do u have the timing set at?
Run ur engine idling at 3000 start advancing timing by turning dizzy until engine starts skipping a little,back it off til it smooths out,back to slow idle n check where ur initial is with a timing light,then come up to 3gs again n check where ur total is,should be round 36* or so.
R u runnin a avc advance?
If so is it hooked up to man or venturi vac.
What jets r u running?
what plugs?
This could be a number of things
The manifold n spacer u r runnin is meant for hi RPM but that doesnt mean it should surge at hi idl.
Thers not a lot of info on your post,need more.
What cam,what jetting,what timing,do u have a degree tape on damper,timing pointer could be marked wrong,list more info on your motor n Im sure youll get plenty of help

[robbie43]

Originally Posted by hauss667

I may be way off base here but if its diesling wouldn't that be a timing issue?

Im thinking the same thing..