On a dyno or trial and error on a pulling track is the only way if thats whats going on. SM and 450 carburetors came with the same size venturi. Both can be tuned to your engine and if correct there's not much difference in my opinion. They do have some different mettering passages. IH didn't tune there engines for max. power. Max. power and a engine lasting for years of hard work are to different things. So if using higher octane fuel and just short runs power can be added by tunning.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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