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Couple things....first to answer the question of stroke, it's 4" which makes it a square bore block also the "M" is intended for the 351 as the 351 is a 400 block with a shortened stroke, the 400 is just a 400, I believe on the emmisions stickers they were labeled 351m/400. Also the 400's had a reputation for pinging due to higher compressions and the decline of availability of leaded fuel in the 70's they tried reducing compression with dished Pistons and backing down the timing curves but they always had the tendency to detonate.

[QUOTE="2strokesteve89, post: 185756, member: 1670"] Couple things....first to answer the question of stroke, it's 4" which makes it a square bore block also the "M" is intended for the 351 as the 351 is a 400 block with a shortened stroke, the 400 is just a 400, I believe on the emmisions stickers they were labeled 351m/400. Also the 400's had a reputation for pinging due to higher compressions and the decline of availability of leaded fuel in the 70's they tried reducing compression with dished Pistons and backing down the timing curves but they always had the tendency to detonate. [/QUOTE]

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