Join Date: Apr 2004
Location: Cheyenne, WY
Feedback Score: 0 reviews
Re: Safe engine RPMs
My understanding of our engine is that the original IH engine was governed at 2600 rpm. At 75 mph with your setup (same as mine) you'll be at the original red line, before Ford moved it up to 3200 rpm. These engines have large pistons, long rods which put a lot of pressure on the main bearings, etc. It's my opinion that if you intend to get 400k miles out of the truck, try to stay at or below 2600 for extended periods. get larger tires to improve your gear ratio if you need to drive at those speeds.
2005 F350 Lariat CC SB 6.0L 145k White, Edge CTS w/EGT, coolant filter, blue spring, HFCM drain plug, CAT-1 EL coolant, rebuilt oil cooler, reconditioned turbo, Bulletproof EGR cooler, T6 5w40 oil, Upgraded: STC fitting, turbo in/out oil pipes, standpipe & dummy plug.