455 harmic balancer bolt

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July 10th, 2018, 03:10 PM

matviar

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455 harmic balancer bolt

Seems that the threads are screwed up on the crank of my 455 motor for the harmonic balancer. Does anyone know the size tap I will need to clean em up? It is pretty big bolt. I am guessing 5/8 diameter or more.

July 10th, 2018, 03:35 PM

oldcutlass

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Location: Poteau, Ok

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Should be 3/4-16, here is a tap recommended to a member with a similar problem.

Click on the Amazon link.

Amazon

July 10th, 2018, 04:44 PM

matviar

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Thanks Eric. I will buy one!

July 10th, 2018, 05:30 PM

OLDSter Ralph

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Location: St. Paul Minnesota

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Be sure to check the first two or three threads on the bolt. I like to keep a small three cornered file around to touch up dings.

July 10th, 2018, 06:08 PM

matviar

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Posts: 126

I got a new bolt. When I tried to start it by hand, it bound after i turn. I didnt want to force it and ruin the new bolt, si I am going to retap the crank threads. They are slightly burred.