cold blooded @#%*$ !

Thanks to the forum, my 340 Demon is REALLY running great. After messing with timing, mechanical advance, vacuum advance and idle mixture....she is purring like a tiger. Great throttle response, geat top end and a nice stable 900RPM idle. Not bad for the big purple cam. Should really see a difference this week as a new 4:10 center section will be on my porch tomorrow, to replace the 3:23's.

My issue is the cold start. This thing spits, sputters, bucks and belches until warmed up. Never had a muscle type car do this before....but then again I've never had a cam with this much duration. I do have a manual choke and really have to "finesse" it to get going.
I have about 8 lbs vacuum @ idle and I know Holley puts a 6.5 power valve in the carb.
Do I need to put a 4 in there, or is this just the nature of the beast?
Author: admin