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Ok, this is on my dads truck, it's a 98 has 4k gov springs #8 plate, head studs and 60 lb valve springs, timing is stock, injectors are stock. He pulls a 35' fifth wheel grossing about 21k. When pulling hills It starts to surge around 18-2000rpm and only in 4th gear. He can power through it but...

ok long story short, I have an he351 and an ht60 with 23cm housing sitting in my shop. the truck has valve springs gov springs, head studs, 100 plate, and bd 60hp injectors. its a 175 horse motor stock. I plan on making the setup this winter, but im not sure on injector size to go to, and im...

ok im at my end of strings on my engine build! i need advice/help figuring this thing out..... my build specs are in my sig line for refrence, but to start it off when i first got the engine built i pin timed the engine and the pump, started the truck and it ran but as i tried to increase the...