Has anyone ever heard of running 26* of timing at idle?
I have been having a stumble issue on my small block Chevy when I stab the throttle wide open. It happens from idle, happens from 1st gear and happens from cruising under 4000 rpms. If I ease into full throttle its fine and the car rips, but if I stab it fast the car falls on its face then takes off.
I have a guy giving me advice that my initial timing needs to be 26* at idle and curved to run 36 by 3000...I have always ran 12*-16* on this motor and have it set at 12 initial right now and all in 36 by 3000, all I changed was the Carburator from an 850-to a more streetable 750 double pumper. Im thinking my pump shot nozzles are just too smal and the carb needs to be jetted properly, but one guy keeps giving me this timing advice and Im skeptical to follow it.
Here is the break down of the engine itself:
355 SBC
10.3:1 compression
64cc heads
Lunati 550 lift 288 degree cam
Weiland 17530 manifold
Holley 750 CFM double pumper
456 gear
powerglide
Car weighs 2800lbs
28" tire