Lowest NEW rad cap your likely to find is 7 psi. You might find an old one that has both rubber seals on it in working condition. Get it checked to ensure it pops off at the rated value on old caps. Recovery bottle is good to keep air out of the rad to reduce oxygenation of the coolant and extend it's life. The head gasket has been working how long with either zero or maybe 4 psi? Now you stuff it to 7 psi, after 60 years? Nah, no problem with mission creep. N' Joy!
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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