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Stock boost is probably somewhere around 15-18. The only way to increase boost is to increase fuel delivery aka turning up the pump. These trucks don't have a wastegate so fuel flow is the only method.

Thanks. That's one of the reasons I attempted this, because I knew I could easily go back to the stock 8 degrees. To be honest I cannot remember which way I rotated the motor. I should have been more careful but I was in a rush. Looking back, I had a 50/50 shot of being correct. lol I can't...

I took my 931A2 out for a drive today for the 1st time after some recent mods. I have the pre boost screw turned out 1 turn, the gov springs tightened 3 clicks and yesterday I advanced the IP timing to 14 degrees. The way I advanced the pump was probably not the correct way. I installed the...