So the whole idea here was/is to get more power from my 4.5 iron block engine, preferably with the stock bottom end. I don't think that any options are that great. 3.5 heads with 6cc less chamber will be good for some gains especially with the thin gasket that is a question mark on the iron block alloy head combo. If I got my hands on a euro long block that has higher compression pistons then added the 3.5 heads we may be in bussiness getting up near 10 to 1 compression and real power per cubic inch. But now I've figured out a combo of stock parts that could be a little higher rpm monster with the longest rods and slightly shorter stroke. Essentially a tall deck 4.2 with a 5.6 liter 154.5 mm rod and a piston shaved to get zero deck . Valve reliefs will have to be made so I'm not 100% sure it will have enough meat on top to be feasible. Gotta look at the pistons I have here to see. 5.6 heads with the lightened AMG style valve train parts could make this great. BUT.......

On top of that whole thing being a lot of work that may not balance nicely and scatter when I beat the **** out of it mercilessly, I drove a customers r129 briefly after rebuilding the frontend and putting tires on it. The best of them with the 722.6 and m119, holy **** that tank moves. Really makes me think it's dumb to even screw with the m117. Just do a steering rack conversion I've been plotting for a long time and put the elephant in there in place of the rat. My SLC is over 1000 pounds lighter (and shedding more) than the r129. It would probably be a low 13 second car on street tires. I have 6-7 m119 I've been collecting and maybe it's time to make it happen.

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