450 D

1952smd · Apr 26, 2011

I need some info guys.Is the block from a 450D the same as a Super MD.Displacement and such.Thanks

Farmaller · Apr 26, 2011

I think SMD bore is 4" and 450 is 4 1/8", other than that is same I believe

FC Andy · Apr 26, 2011

Nope. Basically Displacement ( more specifically, bore size) is the difference. My understanding is that most parts, except pistons, sleeves, and rings will go between them, though. A 450D block will drop right in where super MD block was, and vice versa.

D Slater · Apr 26, 2011

Blocks are the same size with the sleeves removed, you will find lots of SMD engines with 4-1/8 bore pistons already installed. If you want to be picky there is small upgrades to the blocks. SMD started out with a block cast # ending in R1, 450 was up to R5 ending.

450 D

1952smd

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Farmaller

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FC Andy

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