Engine bearings are hard to find new. Don Livingston can have your main and rod bearing shells remanufactured to any underside you want, but I stick to standard undersizes. I have six SC's rebuilt with mains and rods from him. I have had 3 1/2" sleeves rebored to 3 5/8" and 3 5/8" sleeves rebored to 3 11/16". They must be in the block when bored. Boring to 3 5/8" gives the same engine as a '52-'54. No '52-'54 sleeves are available. You will have to change blocks, have new sleeves made somewhere, or bore and sleeve your old sleeve for '52-'54's. These engine blocks have a different kind of seal at the bottom of the block. All other engine parts interchange.
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