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Search: Posts Made By: Griff
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Forum: General Q & A
05-16-2009, 11:46 AM
Replies: 26
Views: 4,992
Posted By Griff

With 300hrs, you definately need to have the...

With 300hrs, you definately need to have the valve springs changed. I would bet that several of the inner springs have cracks. The carbed 500hp springs had all kinds of problems with them breaking...
Forum: General Q & A
05-15-2009, 01:51 AM
Replies: 26
Views: 4,992
Posted By Griff

I don't know what threads you're looking...

I don't know what threads you're looking at:confused:

Stock 454/502 mags are good to around 1000 hrs. Maybe a valve job and springs at 500hrs.

The newer 496HO and HO mags are the same way.
...
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