This will be my custom parts-etc thread, I'll try not to do stuff that has already been done before. The part Im working on first is a custom Turbodiesel 617 intake manifold.
Probably the best intake to start with is the one off the first version of the 50's thru 80's iron diesels, the first om621 intake off the 58-9 Pontoon 190d part# R6211411301, They have the best runners -they start as the same om617 D shape but open into round 1 3/8"tubes about 3"from the ports and is the intake that looks like the first 4" are siamesed.
The later 621 Pontoon intake # 6211411401 and the 220d 240d intakes all have D shaped runners all the way thru the intake and are a lot harder to run a flex stem and a flapper wheel thru to enlarge. Also the 220d 615 616 runners enter the head at around an 75 degree angle instead of almost a straight shot like the Pontoon intakes. This intake will be a add the 5th runner and weld to a plenum but theres gonna be casting for the 5th runner. It will fit under a w123 hood or on other repowering swaps. As of right now I dont know an easy method of making a core for the runner but fortunately have years and yrs of plastics tool experience and a lot of it crosses over, Im stopping by the foundry to talk to the owner tommorrow to get the answer.

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