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I have a 78 nova with a mild smallblock in it. It has a 3core rad.
What rad cap psi is everyone running.

thanks rs78
 

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I run 23 psi with no heater. I have an aluminum radiator that can stand that kind of pressure, but it would probably open a seam on a brass copper stock style radiator or the same brass and copper heater core. Higher pressure combats hot spots (steam bubbles) from forming in your block which is a consideration with a Siamesed bore BBC or a stock SBC 400 block.

Big Dave
 
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