Re: Found a BBGMC v6 401 in TN
The GMC V6 engines were introduced in 1960 so that would be impossible the 1957 Western Flyer came with one from the factory. As far as boring a 305 block to accept the 351 pistons that also seem unlikely, it would by far exceed a maximum overbore of .060. The 351 pistons are considerably larger over the 305 piston bore. 4 1/4 vs 4.56.
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