NOT KNOWN FACTUAL STATEMENTS ABOUT BLACKTOP 4AGE FOR SALE

I go through on the web that when they are not well synced it can cause abundant operating, backfiring and vibrations. Probably I am thinking the wrong way but when they would not be synced then the fuel/air combination might be various would not it?Adjustable cam pulleys will make certain correct timing and cylinder strain tuning. Solid large comp