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Old 10-06-2013, 02:42 PM
Senior Member
Join Date: Nov 2003
Posts: 290
Default Re: 2999289

Originally Posted by markdunlap

Ever find any early 454 BBC #289 or #959 blocks with enough core shift to matter for over bores .060" or less?
Core shift really has noting to do with cylinder placement as I have seen many block that one cylinder would not pass a sonic test making the block useless for a performance build.

I have seen a lot of blocks that show a lot of core shift if your going by the front cam journal and the cylinders sonic test fine. On the other hand I have seem many blocks that show perfect core shift and fail a sonic test.

496 seem to be pretty common and I have seen early and late blocks fail for a 060 over bore.

Being a production block they all have to be checked before any work is done.
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