525 vs 496- How many Hours until rebuild?
06-27-2010, 06:15 PM
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525 vs 496- How many Hours until rebuild?
Gentlemen, how many hours can I expect to get from a 525 EFI before I need a rebuild (on average) vs a 496HO? Any reason to lean one way or another as far as history? Thanks in advance!
07-16-2010, 09:34 PM
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The 525 will need the valve springs replace at about 250 Hrs, when you replace them use the Isky Endurance spring and you can stretch that out to about 500Hrs. Refresh the bottem end at about 500Hrs. The 525 will spank the 425HP but it will run a lot longer without being opened up. I am not the expert but I stayed at a Holiday Inn Express. 
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07-26-2010, 02:08 AM
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The 525 will need the valve springs replace at about 250 Hrs, when you replace them use the Isky Endurance spring and you can stretch that out to about 500Hrs. Refresh the bottem end at about 500Hrs. The 525 will spank the 425HP but it will run a lot longer without being opened up. I am not the expert but I stayed at a Holiday Inn Express.
