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Paul Wong · 05-24-2012, 02:40 PM

The pre 1966 273 heads have 5/16 bolt holes for the intake. After 1966 they went to 3/8 like all other small block mopars. That is why you had to oblong the holes in the early manifold you were trying to use.

05-24-2012, 02:40 PM	#5
Paul Wong Member Join Date: Jan 2003 Location: Las Vegas Posts: 384 Likes: 101 Liked 419 Times in 85 Posts	Re: 273 CDP Block Question The pre 1966 273 heads have 5/16 bolt holes for the intake. After 1966 they went to 3/8 like all other small block mopars. That is why you had to oblong the holes in the early manifold you were trying to use.