Re: Randy Berger's 1956 Caribbean

Posted by BH On 2007/10/28 10:55:55

Randy -

I have a copy of a factory letter to Zones (never released to dealers) that predates STB 56T-20 and talks about a field trial of plugging the relief valve bore on the original pump body (as installed on cars). Yet, a follow-up letter to Zones warns not to install a plug in the field, but advises of a forthcoming sump tube kit.

Have you dissassembled your pump (that is #2, as you cited) and found it to have the 1" long relief valve piston?

I believe PackardV8 noted (in another forum past) that there are also internal differences WRT the internal passage for the relief valve on later design pump body.