Probably 0.35″ for a carbureted engine. I do have a problem with a question about spark plug gap. If you decide to replace the plugs gap them to .50, this is where they should be. Also, the spark plug gap should never exceed .055" unless pre-set by the manufacturer. Since the gap size has a direct effect on the voltage necessary to jump the gap and ionize (light) the air-fuel mixture, careful attention is required. The spark plug gap adjustment should not be changed more than 3 times and should not exceed .008" in either direction. Find CHEVROLET 5.7L/350 MSD Ignition Spark Plug Wire Sets and get Free Shipping on Orders Over $99 at Summit Racing! What would be the best gap for this engine, I have heard everything from .50 to .65 right now they are set at .55. Your msd is a better/hotter design ign then the stock gm hei was and gm rec .045,i would start there ,not the .040 msd rec. The small .040 gap msd rec for the hot ign of theirs you have kills the whole concept of exposing a larger spark kernal to the combustion chamber,here again is the reality of the poor tech line help many vendors have. … I would personally go with MSD wires, they are simply the best. I read one Chevrolet mechanic that gaps his plugs at 0.42″ in small block 350 engines. How important is it to properly gap all 8 plugs on a tired 350 sbc with 1000xxx original miles with a MSD box? They stand for Multiple Spark Discharge, a patented design by MSD Ignition that fires your spark plug multiple times rather than the single time that the factory ignition does. The gap for a 350 small block should be 0.035 inches. Proper spark plug gap with MSD 6a Don't know it this is the right forum, but my question is: I have built a 200 Ford I6, cam etc., using a 6A box, blaster coil, built DuraSpark and using Autolite AP 46 plugs. Fortunately, we’ve done the hard work for you and searched across the market to pull together the five best spark plugs for your Chevy 350 available today. While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. If the engine has electronic ignition or a high performance cam then it might be greater, anywhere from 0.45 to 0.60″. The cam is a CBXR280R-10. Rufas just to know that most of what you and Dave are discussing is over my understanding. I installed the box 3 weeks ago and I just haven't gotten around to adjusting the gap on all 8. You do have to route the passenger side … Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. Spark plugs for the Chevy 350 engine are readily available from any auto parts store. Spark plugs come pre-gapped, but you should always verify the gap with a spark plug gap tool. 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