What is the best thing to do with tired 575's?
11-14-2007 | 09:02 AM
#21
Gold Member
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From: Westport, KY
11-14-2007 | 09:04 AM
#22
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From: Westport, KY
I had mine rebuilt and loved the outcome. Bored them out to 509 blocks. Went with a hydraulic cam and Morel hydraulic lifters. Changed the fireing order. Reworked the heads. Went with MSD ignition. Arizona Speed reprogramed the ECM's. The Blower Shop rebuilt the blowers. They can make the blowers stronger but I wouldn't run them for much more than 200 hours before rebuilding, depending on how you drive it. I picked up 150 hp without intercoolers. I could have got more hp out of them with the intercoolers but wanted reliability.
If you look up 10X he can tell you more about them. He helped rebuild them.
If you look up 10X he can tell you more about them. He helped rebuild them.
11-14-2007 | 11:06 AM
#23
Frank's Marine Service
Joined: Sep 2002
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From: Elkton, MD
11-14-2007 | 11:45 AM
#26
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From: Lake Michigan
11-14-2007 | 12:07 PM
#27
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From: Ottawa, Ontario,Canada baby!
11-14-2007 | 03:30 PM
#29
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From: Tucson, Arizona, USA
I have two at 450 hours. I did a leak down last summer
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.
Pesky Varmint
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.
Pesky Varmint
11-14-2007 | 04:10 PM
#30
Platinum Member
Joined: Nov 2002
Posts: 4,288
Likes: 87
From: New Jersey
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.
