Is 426ci 360 a small block?

dadodgekid said

Outstanding!! Just curious.. do you think it would crest 650hp with a set of well built W-2's?

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I cannot say. I think I haven't had my hands on set of W-2 heads since about 1980 when Dad was building his NASCAR engines. The last I remember, his 357/340 was at 610 HP with the W-2 heads.