Build 540's out of those blocks and get the blowers rebuilt.
Put all of the parts back in and then you woun't have to run them so hard.
What was the firing order and what did you change it too. ?[/QUOTE]
They were standard and I don't know what he changed them to. I can't check because I sold the boat.
Has anyone else run the different firing order on there motors?It does make sense.
and the port engine just exceeded Merc manual spec
and starboard just passed.
Pulled the head and you could still see crosshatching
on the cylinder walls. Oil pressure on both is just like
new and they never use any between changes every
25 hours (Mobile 1). So I rebuilt the heads on the
port motor (cost around $1000 after I pulled them
off and reinstalled them myself). Will do starboard
this year. Maybe your engines aren't really that tired.
Never felt any power loss either. What prompted the
heavy testing and maintenance were driveability problems
ultimately discovered to be contaminated fuel filters.
I have 575's freshened by Innovation w/ bumped boost (620 hp) and they are great! I was talking with Ron Potter (former Nor-Tech engines) when I was down in Sarasosta and he said that with relatively little work they could be very reliable 700hp motors. I am assuming he would do something similar to what JC was talking about.
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