Not Ranked
Yes,
It isn't the rotational velocity you need to worry about. You can spin a well balanced engine to 8,000 rpm and it will live through millions of cycles (rpms).
Are you asking whether an FE street car can turn 6500? sure it can provided you give it the tools it needs, solid lifters valve train...
The 4 bolt 406's came about when ford tried turning 8.000 rpm in a 5200 pound car for 500 miles. It's the loading and unloading of the crank saddles you need to worry about. Obviously the loading and unloading of a 400-450 hp engine is far less, 25- 30% less than a 600 hp FE.
A 2500 pound street car driven responsibly can occasionally turn 6500 for years and years... But why risk it??? A good seasoned FE block is $1,000. a new genesis block is $4,000... Is the $3,000 you save really going to break you?
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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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