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What size are the starter bolts on a 1994 GMC 6.5 turbo diesel?

The starter bolts on a 1994 GMC 6.5L turbo diesel are typically 1/2" - 13 UNC. However, it's always best to verify this with a measurement of the existing bolts before purchasing replacements. Bolt sizes can sometimes vary slightly due to manufacturing tolerances or even minor model differences.