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... procedure as for inlet valves, but cut away combustion wall to clear head with 36 mm. diameter cutter, bore valve choke to 29 mm. diameter and recut seat 30°x32-8 mm. top diameter. Fit stronger valve springs (150 1b. open tension). Outer spring (Part No. M.G. 862/462) and inner spring (Part No. M.G.862/463). These are interchangeable with the standard springs, but one point should be noticed : they are staggered pitch springs and the closed coil ends should be fitted next to the cylinder head. Valve crash occurs with these springs around 6,500 r.p.m. (a) Use standard cylinder head gasket. (b) Use \" thick x f" O.D. washers under cylinder head nuts (to correct reduced thickness). (c) Use 4 rockershaft bracket packing pieces (Part No. M.G.862/ 459) to correct rocker adjustment. These are ^(." mild steel with 3 holes to match base of bracket. (d) Plugs : Use Champion L.A.I I or Lodge R.49. (e) Tappet setting .022". (0 Ignition setting : T.D.C. (g) Use standard \\" carburetters. Using fuel 75 1/2 benzol and 25 1/2 petrol, with carburetter needles E.S., Jet -090", the engine should then give the following brake horsepower :— B.H.P. : R.P.M. : 61-00 5,000 65-00 5,50 63-00 6,000 Or using fuel 50% methanol, 20% petrol, 30% benzol, with carburetter needles R.O., Jet -090", the engine should give the following brake horsepower :— B.H.P. : R.P.M. : 62-5 5,000 66-5 5,50 640 6,000 ...
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