Thank you Wbulk
"We have all seen SB pump rods twisting off for various reasons. So a lot of guys put on the ARP better pump rod, which is a good idea. But consider, with a HV pump if you have
stock oil clearances that pump is going to put a greater strain on that distributor gear and reasonably cause greater wear. I just don't put in the HV pumps in the SB for that reason. It's not worth ruining the engine for."
I personally have used 3 variations of HV pumps on my 289 for 23 years with no issues. Keep this in mind... the PUMPS dont create the resistance imparted upn the gears, it is the resistance to flow (ie pressure) that does. The clearances built into the mains & rod bearings AND rod side clearance is what will permit the
oil an "escape route". If you put an HV pump on an engine with clearances that are tight and on the low side, as in a standard non hipo build you're asking for trouble. IMO the reason for a HV pump is if the clearances are set on the high side for less drag, then with a little thought resrictors can be place to redirect the additional volume of
oil. They have their place if used for the right application. Fluid dynamics 101
PS: When istalling any fresh cam always check the leading edge of the teeth on the gear. Many time they will have a very sharp edge that need to be burnished or "knocked down" so it will not be the initial contact point with the distributor gear. This is a small but important detail for
all builds.