[Roadsters] Radiator cap question

[John F Sandhoff]

> IRT: radiator cap:
> how many lbs. of pressure...

4 PSI

> I don't mean the "push-button" cap on the overflow canister,
> but the cap that sits just in front of the cylinder head.

Infinite. It's a blank cap, used for filling the cooling system:

<http://www.datsunroadster.com/PIC_PAGES/NEW_PARTS_PIC_PAGES/214-03.htm>

-- John
     John F Sandhoff   sandhoff at csus.edu   Sacramento, CA