575 SCI rebuild
09-02-2019, 08:35 AM
#1
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Thread Starter
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.
09-02-2019, 10:28 AM
#2
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change the heads and cam,lower the compression a bit.
09-03-2019, 09:52 AM
#3
Registered
Roller cam, Intercooler, freshen blowers, and pulley for max boost.
09-03-2019, 12:14 PM
#5
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
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
09-03-2019, 06:31 PM
#6
Registered
Thread Starter
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
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
09-06-2019, 10:21 AM
#9
Registered
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.
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.
