HotJimmy
Got new TRW forged 10:1's installed in my 401. Got motor all buttoned up and running tonight, but only weird thing is it blows puff of black smoke on rapid acceleration. If i slowly rap up the motor there is no smoke. I drove it about 45 minutes tonight around the neighborhood (neighbors are pissed 8) ) Runs great, but smoke is really bothering me. Carb is a Holley 750 double pumper- maybe new adjustments? 290 duration cam TRW's, stock heads decked .030", air gap intake. I was thinking about bumping it up to an 850cfm vacuum secondary carb. What is the smoke!? :(:
HotJimmy
Also it doesn't seem to wrap up as fast as it did before with my stock dish .040 over pistons.
jeepsr4ever
try running a higher octane
tufcj
Black smoke is usually because of a rich condition (too much fuel). You may try smaller secondary jets or bringing in the secondaries at a little higher RPM. You may want to try something with a vacuum secondary, unless you're drag racing it. I think a 750 is plenty. A bigger carb might only make the problem worse.
Give it a chance to get the rings seated before getting too concerned. Rich is better than lean during break in.
Bob
tufcj
HotJimmy
adjusted the carb today, black smoke mostly all better, but i have consistant problem with squashing the vave seals and burning oil on high rpm. My cam is over .500 lift, i forget the actual #, will i still have the problem with the edelbrock performer heads? I'm so fed up with replacing them that i'm ready to make the purchace.
