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Yea. 8k  take it up to 6k.. see if it noses over (the hp curve) If it is strong try 7k.. I would limit my fun to below 6500 unless you are confident in your build. Roller valve train will help. The very least you might try a good roller rocker arm set up. You mention adjustable lifters but you didn't say it was a solid lifter engine.. That will make all the difference at 6300+ rpm. Beyond 6300-6500 you really should give the mains some support, either a girdle ala the 385 series engines or cross bolting ala the 427's.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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