Info needed (over-heating issues)

[bdmcgee]

Hello all,

I have a 1969 GMC w/402 BB. . . and she runs a little hot. We've added a ton of performance parts, but the HP hasn't increased so much where my stock 4 core shouldn't handle it. I've put a new thermostat on, all new hoses, new water pump, and have pulled the radiator (clean as a whistle) I have two questions before I pop a gasket myself!

What is the correct pressure rating for the radiator cap? (I suspect I running one that's too low.)

Also, what is the right size (diameter) of the stock water pump & crank pulley? I think it may have been changed out to a larger one along the line somewhere.

Thanks for any help. . . .

JH