Which version of the 617 engine is in your 300sd? I see in the pictures the dual oil drain/return lines, and the oil/vapor seperator in the air cleaner.

The reason I ask, is I am replacing the original .950 engine (#5 cylinder died a noisy death, knock, then blew the tip off the prechamber) with a .952 engine. I have read conflicting stories on wether it will fit around the cross body stiffeners and supports.

I like your alternator bracket modification to get it to work with the larger alt.

Hammerwerfer

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1985 300DT 241,000 miles
1979 300SD 202,000 miles