What pressure radiator cap?

[fastdave]

What pressure radiator cap is safe to run? Solid engine/cooling system with a new Ron Davis radiator

 

[HistoricMustang]

What pressure radiator cap is safe to run? Solid engine/cooling system with a new Ron Davis radiator

Standard cap should be OK unless you are going to run high RPM's for extended period. If so move up to 21 pounds. The pressure build up in top of radiator at high RPM's will tend to lift a standard cap with water escape.

HistoricMustang