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| GMC V6 and V12 Engines Engine repair and rebuilding |
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#1
May 5th, 2025, 01:10 AM
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Maximum bore each block can take
I have a 351E with magnum intake, heads, and exhaust manifolds. Can it be bored out to 401? Are all the different displacement blocks the same dimensions?
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#2
May 12th, 2025, 06:57 AM
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Re: Maximum bore each block can take
The bore of the 351 is 4.56", bore of the 401 is 4.88". I don't think there is enough cylinder wall thickness in the 351 block to accommodate a 0.32" overbore! As far as dimensions are concerned externally they are the same but cylinder bores are different. The 379, 432, and 478 use the long stroke crankshaft.
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