I often did a mild cleanup on race engines, not much more than cleaning up casting flash. You want to be very carefull about changing the shape of valve bowls and ports. I learned that unless you know what your doing, you tend to make big shiny holes that flow no more and sometimes less than stock. A flow bench and knowing how to use it are required for porting work that actually improves things. On some engines, removing the mismatch between manifold and head removes a reversion dam that helps charge cylinders at lower rpm.
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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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