V-10 & high mileage, need advice

Thanks to ALL replies.
I just spoke with my MECH. who has the exact same motor in a 31ft Minnie with 36.
He said like other posters have shared, 86k is not too many miles if the service records are there. I'm buying it from the 4th owner so that could be a problem.
He also said to closely check the coolant as blown head gaskets can arise if coolant wasn't checked and changed regularly.

Mbrown wrote:
Looking to buy a 2000 Jamboree with an 86k V-10
This Rig is a bit over our Cash budget but very clean.
My questions are;
Is 86k high mileage for a motorhome ?(like dog years)
Please help me make the right decision !

The other questions have been answered quite well so I will take on the first one.

86k is not high for a Motorhome of that vintage if it has been well maintained, and has records to prove it. Newer vehicles with proper maintenance will go 200000 miles easily. The house part is more likely to have problems as it gets older.

The OP asked if buying a rig with 86K miles on a V-10 was a good idea. Average user miles per year are around 5K miles x 14 years = 70K miles. If engine and drive train has been carefully checked out by a competent truck mechanic, it might be good for many more miles without major overhaul expense. I would be concerned with life remaining in the roof AC unit, fridge, furnace, awning, water heater, etc. Our fridge and roof AC died at around 10 years. Tires are good for 5-6 years, by date codes, sitting parked in the sun. Replace any tires with sidewall cracking for driving safety. Have brake systems serviced including flushing and replacement of brake fluid. Have engine cooling system checked and serviced including radiator, clutch fan, water pump and all belts and hoses.

The improved HP was due to a change in the crank design also.

There have been several versions of the Ford V10
Original version years through 99
Improved head & crank (increased HP), put in the F series until the three-valve was introduced (2005) and in the E series through the end of the E series chassis production (2014, 2015, I forget now)
Then the 3 valve design, which has only been put in the F series chassis, they produce 365 HP

I and many MANY people owned (own) early production V10s with absolutely no issues. The reality is the plug problem was certain not common.

Many many of us have been successful with V10's. The main sparkplug issue was CHASSIS years 1997-98-99. In CHASSIS year 2000 they introduced "Performance Improved" (PI is molded into them) heads. That added threads to the sparkplug holes to address the plug blowout issue, and upped horsepower from 275 to 305. Problem, though... Some (and I repeat only SOME) of the PI heads were not machined correctly in the sparkplug area. The issue was apparently by manufacturing plant. With enough research you can probably figure out which PI heads are OK and which might be questionable. But you'd want to consider all 1997-98-99 heads questionable.
I, personally, would shy away from the non-PI years. You can see our chassis is 2002, and I felt safe going with a V10 equipped with PI heads.
You are correct in that engines 2004 and later had properly machined heads, no matter which plant produced them.