Im doing a custom intake that will end up similar to forum member JTY intake seen elsewhere im starting out with a 621 intake -the great grandaddy of the 617 out of a 58' pon--Toon. It doesn't seem that long runners make sense on a turbo diesel, but perhaps yes according to Jeemu, like a naturally asperated diesel is just a engine that hasn't seen boost yet--so maybe on takeoff and up to the transition where boost takes over, perhaps there is some benefit to long runners with cylinder filling. Anyway it is a plus to get the plenum away from exhaust and heat sink. Im gonna whack these tubes off at about 7.5 and use the spare runner material to scab on the 5th runner and might use the d shaped plenum from ross machine.

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