here is the problem, you cant just throw parts at a car, look at how much money you wasted thus far. as for it being rings, unless you are smoking really bad they are fine and would not cause an issue, a bad ring is a bad ring no matter cold or warm. also when you changed over the head you would have been able to see if the rings were bad by any abnormal signs of oil or anything like that.
now lets get into this, you need 3 things for a motor to run fuel, compression and spark. when you first crank the car and it doesn't start grab a can of starting fluid or ether and spray it onto the filter then go back and crank the car, if it cranks right over its an intermittent fuel issue and you need to check the pump and filter etc because the pump could not be building pressure fast enough or the filter is clogged.
if that changes nothing verify spark at the spark plug. first thing would be pulling the fuel pump fuse or relay so you don't pour gas into the cylinder. pull the wire, then pull the plug then put the plug back in the wire. lay the plug on something metal and have a friend go turn the key and watch if there is spark at the plug.
if those tests come back good i would do a leak down test to show exactly where you are losing compression. post up after the fuel and spark tests
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