Quote:
Originally Posted by 64speed
Paul Carter blueprinted it
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54D-S provides 55 psi at cruise, 54F (SD) provides 80 psi at cruise.
80 psi is ideal for a large journal engine. I don't really buy into the whole distributor drive gear wear wives-tale. I have run the 54F for many years with no adverse effects on a stock HEI distributor gear. For those running a composite or brass gear, yeah, you will wear them out faster with an 80 psi pump.