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Message: [QUOTE="BrewTown, post: 1546397, member: 31811"] Really good info here. Couple things I may add. A dual disk clutch will engage just like a stock clutch, which is nice for towing. The pig power single clutches have more of a light switch effect. In or out. Towing with them is not ideal, especially backing. Low range can help, pretty slow though. Shifting speed however, a dual disk pretty much takes fast shifting out of the equation, and, if you try, it will beat up the syncros in the trans. If you really have a 650+ goal, 2 scenarios I see. In reality, both need connecting rods for longevity. 1. Enough fuel for 650+, and spray to hit it. 2. Port the heads, I think Gray's Diesel is doing cams. To me, it sounds like the T-4 and 467.7 is your go to. I think the S369 or S372, that exhaust housing gets restrictive, especially on spray. Now, let me discredit myself by saying I've never owned or built one at that level. My ZF6 had 230/100s, 1st gen KC38R and a SBDD. I thought it was fun... Miss it, and going back! [/QUOTE]

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