Radiator caps have a # of lbs on different ones. What does this do. I am going to buy a new one, but don't know the difference, considering my signature at the bottom what should I get. I am having temp. problems and am hoping this could help.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER
EDELBROCK 600CFM CARB.
KN AIRFILTER
UNDERDRIVE PULLEY
ACCEL HEI DISTRIBUTOR
2:73 GEARS

 

It's some kind of calculation like for every pound of pressure the coolant is under the boiling point goes up X amount of degrees.

 

He's right. IIRC stock is 15lbs. Anywhere from 12-16 would work fine.