I don't think there really is one. Just some specific preventive maintanence that needs to be done. People have said the supercharger needs to be gone through every 300 hrs. Mine never was, but I changed the lube every 25-30hrs. The cam is not real big, so valve train issues are about the same a black engine. My 525sc also used half the oil that my now 250hr 502mpi's use.
Lots of people have had problems with the factory Gil exhaust manifolds cracking.

so is upgrading to an 8:71 the only way to get another 100hp?

You could also go with a Merc 420, or 671. Many times you can find good deals on 420's and have them freshened at The Blower Shop. That will get you an extra 100hp, EASY.




Darrell.

Griff, this 525 sc has the cmi e-top's.

Its going to be hard to get 675 hp out of any 454ci even with a bigger supercharger. You would need new heads also.

IMO, he would be better off selling what he has and starting new with a 540.

There is a guy here on Champlain that has trip 525sc's in a fountain that is getting 650hp. 9lbs of boost,no intercoolers!!

Race fuel, and a LOT of it!

With the 177's?

Can I watch when YOU build that spare drive ,Smitty

Yes,177's and I don't believe he is running race fuel.