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Tim H · 09-19-2021, 08:44 PM

I've never seen an "854" block in any OE displacement other than 402. Not aware of any successful 4.125 bore blocks living with an overbore to 4.250." At .060 over I would think the cylinder walls would be dangerously thin, because it is already .030 over from the factory.

09-19-2021, 08:44 PM	#2
Tim H VIP Member Join Date: Jan 2007 Posts: 1,042 Likes: 1,072 Liked 481 Times in 158 Posts	Re: Engine block question.......? I've never seen an "854" block in any OE displacement other than 402. Not aware of any successful 4.125 bore blocks living with an overbore to 4.250." At .060 over I would think the cylinder walls would be dangerously thin, because it is already .030 over from the factory. Last edited by Tim H; 09-19-2021 at 08:53 PM.