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575 SCI rebuild

Old 09-02-2019, 08:35 AM
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Default 575 SCI rebuild

Multiple threads on these engines. Bottom end now has 410 hrs. Just did a leak down test and it appears I’m due for another top end rebuild. Time to pull the engines and go for a complete rebuild? I’d be looking for +700hp.
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Old 09-02-2019, 10:28 AM
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change the heads and cam,lower the compression a bit.
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Old 09-03-2019, 09:52 AM
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Roller cam, Intercooler, freshen blowers, and pulley for max boost.
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Old 09-03-2019, 11:23 AM
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Originally Posted by c0ncEpT View Post
Roller cam, Intercooler, freshen blowers, and pulley for max boost.
Currently running Whipple Inner Coolers and smaller pulleys. I am thinking about 871's. Trying to decide if its time pull the engines and go for the complete rebuild.
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Old 09-03-2019, 12:14 PM
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i did mine at 15X

refreshed bottom end rings and bearings, stock merc components,
525EFI cam
AFR CNC 305 heads - big chambers dropped compression even lower then stock
.040MLS head gaskets,
dyers 8-71 kit
eddie young EFI ontop
Holley HP as the mefi **** the bed on the dyno -
made 775hp on 4psi at 5900 un cooler

with the whipple cooler im sure you can do a super easy 8XX
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Old 09-03-2019, 06:31 PM
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Originally Posted by LTZCrew View Post
i did mine at 15X

refreshed bottom end rings and bearings, stock merc components,
525EFI cam
AFR CNC 305 heads - big chambers dropped compression even lower then stock
.040MLS head gaskets,
dyers 8-71 kit
eddie young EFI ontop
Holley HP as the mefi **** the bed on the dyno -
made 775hp on 4psi at 5900 un cooler

with the whipple cooler im sure you can do a super easy 8XX
Do you have any pictures?
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Old 09-04-2019, 11:03 AM
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Terry Martin / W.Kentucky
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At 410 hours, I think I'd just do complete refresh.

Eddie Young did good (top end only) on some 575's we had. Heads, roller cam, tuning, etc.
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Old 09-06-2019, 09:35 AM
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Originally Posted by kjm5125 View Post


Do you have any pictures?


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Old 09-06-2019, 10:21 AM
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I went .030, cleaned head and deck, 525 roller cam(I think), Super Chiller w/slightly smaller pully, stock fuel system, stock MEFI
Cam I .610/298* E .632/306*
Press fit pins and cast iron heads
Stock oil cooler
[email protected] [email protected]
4# boost
92 octane
Ed Trihey @ Ed's Automotive assembled/dynod them
310 hours and still run the same based on top speed of boat hasn't lessened.
WOT oil pressure [email protected]@5350RPM for 10 minutes+ freaked me out but 310 hours later I guess it works and it's easier on the distributor gear.
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Old 09-07-2019, 08:07 AM
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Thanks guys, a lot of good information.


Last edited by kjm5125; 09-07-2019 at 08:09 AM.
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