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5851a · 05-15-2021, 03:51 PM

You will probably be happier with a small block. Nothing wrong with the 400, but a lot of the older Fords get the small blocks swapped in for a good reason. Aftermarket really stepped up and the engine was in production longer. 351/400 lasted 11 years and the small block lasted 40 years.

05-15-2021, 03:51 PM	#21
5851a Senior Member Join Date: Oct 2014 Location: NE Iowa Posts: 1,665	Re: 71 LTD Info Wanted You will probably be happier with a small block. Nothing wrong with the 400, but a lot of the older Fords get the small blocks swapped in for a good reason. Aftermarket really stepped up and the engine was in production longer. 351/400 lasted 11 years and the small block lasted 40 years.