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Old 03-30-2014, 08:20 PM   #9
Starfury
6th Gear Member
 
Join Date: Aug 2007
Vehicle: 1967 Ford Mustang Fastback
Location: Davis, CA
Posts: 5,561
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I drilled my block when I installed my Twisted Wedge heads. No adverse affects...
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Tad H.
'67 Fastback
331 stroker
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