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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. |
change the heads and cam,lower the compression a bit.
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Roller cam, Intercooler, freshen blowers, and pulley for max boost.
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Originally Posted by c0ncEpT
(Post 4705102)
Roller cam, Intercooler, freshen blowers, and pulley for max boost.
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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 |
Originally Posted by LTZCrew
(Post 4705119)
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 |
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. |
Originally Posted by kjm5125
(Post 4705167)
Do you have any pictures? https://cimg6.ibsrv.net/gimg/www.off...9087bc9f54.jpg https://cimg7.ibsrv.net/gimg/www.off...1e3ff5147d.jpg |
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 703HP@5372 740TQ@4100 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 38PSI@170F@5350RPM for 10 minutes+ freaked me out but 310 hours later I guess it works and it's easier on the distributor gear. |
Thanks guys, a lot of good information. |
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