Car is going to 260+ degrees!!!!
It's running open headers with no o2's right now. Has EGR deleted and no Air pump. lemme know what yall think!
car also has not A/C lines if that makes a difference
Did you bleed out the air bubbles when you filled it?
Also, make sure you use an LT1 thermostat (the tall ones) not a SBC thermostat
and that it is installed with the spring down.
With the car cooled down, pop the radiator cap and check the fluid level.
Also start the car and see if coolant is being pumped into the radiator
(should be a solid stream just below the cap)
Make sure you keep close to a 50/50 mix of water and coolant.
Too much of either will cause cooling problems.
If you already put in 1gal of coolant and 1gal of water, add an equal amount of each until it's full.
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BTW glad you didn't overheat your car man. 



