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Message: [QUOTE="907DAVE, post: 321446, member: 672"] Thanks Dave! I am just speaking from bad experiences: First experience was on my stock motor with roughly 130k. Installed 910's to 1.80 and was running 50psi and roughly 60psi BP. When that motor tossed a rod I found some pretty notable contact. Second motor received .010 shorter pistons, the thicker Cometics, 910's (again set to the 1.80 height) and everything else set to factory clearances . After I blew the *** out of the Cometics the first time I hit 60psi I found that EVERY exhaust valve hit. BP's were in the 80's as I was in the process of dialing gates. That motor received Fire Rings and 910's shimmed to 1.75 per recommendation. Next time I ran the truck I broke multiple rocker arms.... The motor then came apart and received a set of Crower springs set to 1.90 and never had a problem sense. Only makes sense that the springs was the culprit, right? [/QUOTE]

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