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What is the best thing to do with tired 575's?

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Old 11-14-2007, 10:02 AM
  #21
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Originally Posted by BL6 View Post
I'd suggest selling them to some poor unfortunate soul who currently has, oh I don't know, say 496's. And start fresh!

And yea, I'd be open to parting with my 496's.
Ditto that here!
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Old 11-14-2007, 10:04 AM
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Originally Posted by Quiet Storm View Post
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.
Wouldn't the intercoolers improve the longevity of the engines?
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Old 11-14-2007, 12:06 PM
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Originally Posted by JCPERF View Post
Cam,head work, more boost for ex.
What do you think it's capable of with an 8-71 or Whipple???

800+?

What did the set that you showed me up at your place make?
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Old 11-14-2007, 12:06 PM
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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.
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Old 11-14-2007, 12:41 PM
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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.
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Old 11-14-2007, 12:45 PM
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Originally Posted by Gunrunner72 View Post
Wouldn't the intercoolers improve the longevity of the engines?
I thought they would too but I didn't want to make a lot of hp so they advised that I leave them off.
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Old 11-14-2007, 01:07 PM
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Originally Posted by Quiet Storm View Post
I thought they would too but I didn't want to make a lot of hp so they advised that I leave them off.

You must not have much boost. anything over 3.5 tends to want/need an intercooler.
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Old 11-14-2007, 01:20 PM
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Has anyone else run the different firing order on there motors?It does make sense.
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Old 11-14-2007, 04:30 PM
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Originally Posted by Jupiter Sunsation View Post
300+ hard hours
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
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Old 11-14-2007, 05:10 PM
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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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