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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Crank bolt/March Underdrive Pulley bolt sizes?

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Old 10-19-2010, 12:19 AM
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Default Crank bolt/March Underdrive Pulley bolt sizes?
I need the sizes for the crankshaft bolt and the bolts that go into the crank hub for a March underdrive pulley. Any help is appreciated.
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Old 10-19-2010, 12:27 AM
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Just bring your bolts to ace hardware or comparable and bring your pulleys with. Make sure its grade 8 and atleast sticks out 1/2" further. Its a 7/16*14 I believe
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Old 11-06-2010, 09:10 PM
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I know I'm in this thread way late. I couldn't find the exact length, but I used 7/16-14 x 2.5" long. I put two washers under the head, and they cleared the opti.
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