[Jersyboyy]

I say either you have air in the system or a bad/clogged radiator. When I took my motor apart to swap head gaskets because of overheating issues it sat for months causing the radiator to get all nice and dry inside and out. I tapped it, banged it, rattled it around in my hands with the holes facing down and long behold a TON of crud just kept coming out including a BUNCH of old rubber rings that use to seal the thermostat. they got sucked into the system and over years clogged the radiator more and more their was a good 6 silicone rings which use to be thermostat gaskets made from hi temp rtv. Now along with the new water pump no problems.