I'm wondering why you're calling the Roosamaster pump stupid? I think Vernon Roosa was a pretty smart guy. His pump set the stage for many tractor companies to change over to diesel. And, companies like CAV, Lucas, Rotodiesel, and Bosch paid for permission to copy it and use in Europe.
I can turn the pump up in your 4320 in 10 minutes. Just pull the long anchor stud out (takes a 7/16" wrench), and take out a lock-clip, slide the yoke over, and you THEN reach in with the Allen wrench.
As far as your 6.2 goes, if you already have a J-code engine, turning up the fuel accomplishes nothing. If it's a C-code, it buys you a little power. But, the J-code pump has a larger delivery valve then the C-code pump and turning up the C-code pump does not work as well.
Here's all the pumps used on 1988 6.2s. LD pumps have the small delivery valve and HD pumps have the big one.
DB2829-4524 23500416 1986-89 HMMWV (Military) C/K — — DB2829-4544 23500346 1986-88 HD C/K & P Truck C/K — — DB2829-4548 23500587 1986-88 Industrial - 12V (Clark) C/K — — DB2829-4554 23500931 1988-89 LD C/K Truck (Auto. Trans.) C/K — — DB2829-4555 23500933 1988-89 LD C/K, R/V Truck - ALT. (Auto. Trans.) C/K — — DB2829-4574 23501280 1987-88 Generator - 24V (Clark), 1800 RPM C/K Made from DB2829-4548 — DB2829-4581 23500932 1988-89 LD C/K Truck (Man. Trans.) C/K — — DB2829-4582 23500934 1988-89 LD C/K Truck - ALT. (Man. Trans.) C/K — — DB2829-4612 23501993 1987-88 Industrial - 24V (Clark), 3600 RPM C/K Made from DB2829-4548 — DB2829-4636 23500941 1988-89 LD G Van (Auto. Trans.) G — — DB2829-4637 23500942 1988-89 LD G Van (Man. Trans.) G — — DB2829-4638 23500943 1988-89 LD G Van - ALT. (Auto. Trans.) G — — DB2829-4639 23500944 1988-89 LD G Van - ALT. (Man. Trans.) G — — DB2829-4646 23502177 1988 HD C/K, R/V, P Truck & G Van G DB2829-4723 Note 7 DB2829-4647 23502178 1988 HD C/K, R/V, P Truck & G Van - 1.2 cSt G DB2829-4724 Note 7 DB2829-4648 23502179 1988 HD C/K, R/V, P Truck & G Van - ALT. G DB2829-4725 Note 7 DB2829-4655 23502229 1988-89 Industrial - 12V (Clark), 3600 RPM, 1.2 cSt C/K Made from DB2829-4548 — DB2829-4701 23503123 1988-89 LD R/V (Auto. Trans.) C/K — —
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