by spencerdiesel » Tue Apr 26, 2016 6:56 am
Kinda like EGT's, there's some grey area when it comes to revs. How many miles are on the stockers, how much boost you will see etc. Because I can't take a seat under my valve cover and watch the action, I keep mine from going over 3300. I think higher boost lowers the safety margin on rpm, but I don't know how much.
If I ran heavier springs I'd add zinc additive to the oil to keep cam/tappet wear to a minimum. Do you need the zinc, probably not. But there's a lot more pressure over worn stock springs, and most modern emission oils don't have zinc and moly anymore.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank
H1C/18
Fuel: Power Driven Stage 2 sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 1 turn in, timing to the head/ >1/4”
Muffler delete