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Old 07-08-2011, 09:44 PM   #1
Benson
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Join Date: May 2010
Location: Cen~Col - Central Highlands
Posts: 2,757
Default Model B engine modification ... what is it?

Found this block today. Can anyone tell me what the purpose of this modification is?

Grooves are 0.045 to 0.060 inch deep and go from valve cage to intake / exhaust ports and appear to have been made with a rat tail file.
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