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Is there an advantage to converting to internally balanced?
 

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A 289 with a light recip mass are pretty easy. Been awhile, but 400-500 wasn't uncommon 10 years ago. Mainly did such for endurance (road race/off-road) apps.
 

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When I was building my 408, it was going to add about $600 to the build, IIRC, then I had the added cost of a new, after-market balancer (already had a rebuilt stock '70 balancer).

For me, the costs didn't justify the gains, so I opted not to do it. Even at the track, I really don't rev mine past 6k.
 

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When I had my 427W done 5 years ago it ran me $375. But the machine shop I use gave me a good deal on it. My guess now would be closer to $600 to do it.
 
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