Truck Shop, what's your view on setting Top Stops to 72 in/lbs? My uncle ran several Big Cams to a million miles setting the preload to 72 every 100,000 miles. He feels they run better because you're compensating for lobe and follower wear. Just wondering what your opinion is because from your posts it sounds like you know your way around a Cummins.
I have set them both ways and the engines ran about the same. Although setting injectors on a big cam at 72 in lbs does cause the injector to wear a little
faster. If set at 72 then checked on the base circle method instead of coming in at 6 in lbs, they run around 10 in lbs. That's what I have found.
The best way to gain more out of a big cam or small cam, Is to back the injector timing from 70 on a big cam to 74. And a small cam from 36 to 40.
It ends up with a little less throttle response but the rpm hang time between shifts is longer.
Some years back I worked for a shop that built the long blocks for a diesel machine shop. I suppose I long blocked 90 plus cummins, 40 cats. And
I don't know how many inframes I've done.
Truck Shop