Posted by Janicholson on August 30, 2010 at 06:35:25 from (199.17.6.223):
In Reply to: Steeped head pistons posted by nickc711 on August 29, 2010 at 18:48:45:
THe pistons (if put in correctly and of the correct size for the bore, will work. The steps of the new pistons will give substantially higher compression. Which is also OK. if there is doubt about the pistons hitting valves, or the head, the head can be put on with an old gasket, with modeling clay (oil based) layerd on the piston "steps" about 1/8" thick. Turn the engine over by hand to be sure it does not bind. No point on the clay chould be less than .020" thick. Where problems are found are the edges of the step. (only one piston needs to be installed to do this check, and it is unlikely to be a problem. Just tighten the head bolts to 1/2 their normal torque, the gasket is already smashed. If the pistons clear everything, the worst case is to need to use mid grade or premium fuel if the compression is in the 160psi or greater range. Of course several manufacturers make different step sizes for different ratios. IH made them for altitude adjustment from the factory. Jim
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