BBC "509" 4.500 Bore 4.000 Stroke 13.2 to 1 compression Comp Roller Cam 726/714 Lift 284/294 @ .050 on a 110 lc Rectangular Dart Pro 1' 325CC ported a lil bit Rectangular Dart Intake ported to heads Hooker Super Comp Headers 2" primary and 3 1/2" collector Digital 6 tested good SS coil tested good billet dist. tested good. Motor has spark, but when turning the motor over it sounds like it is retarded...Timing is setup properly??? Brand new rebuild on engine will not fire? Battery shows 12.4 volts and I put on the charger and it shows 12.5 but sounds like it is struggling to turn over...HELP Could it possibly be a dead cell in the battery and then when a load is put on it the power output dies?