Thread: Necessity of align hone mains and sonic check?
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Old 06-09-2021, 06:06 PM
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Join Date: Mar 2000
Location: Spring Hill, TN
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Default Necessity of align hone mains and sonic check?
I have a 69 and 72 400 block that are standard bore that were running good when pulled.. I asked a machine shop for quotes on cleaning, boring, decking, freeze plug and cam bearing install. The shop also quoted align hone of the mains and sonic checking. Aside from simply being thorough, how necessary is align honing and sonic checking of a known street engine that would be bored .030 over?

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1970 GTO 400 Atoll Blue, PS, PDB, A/C
Was M20 4 speed, now has Keisler RS600 5 speed.
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