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Firecrater pistons revisited
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Posted by Joe/WI on June 02, 2000 at 13:37:04 from (205.188.196.58):
I read the earlier postings about the differences between firecrater and stepped head pistons and first of all wanted to point out that there IS a difference between the two.The firecraters have two mounds on the top of the piston surrounding the area just inside the spark plug hole.The mounds stick up 1/2-3/4 of an inch into the compression chamber.The stepped head are raised about 1/8- 1/4 inch ,but flat for about 2/3 of the top of the piston opposite the valve area. Anyway,I have a question. I just took out the stepped head pistons out of my block and am putting in firecraters.There is a significant difference in the amount that protrudes into the compression chamber with the firecraters. I don't know the distance that the valves travel into the compression chamber,but worried that the valves might hit the mounds.The local H expert at the IH shop told me not to worry about them hitting.Someone else suggested that I put a lump of modeling clay on the piston,put the head on loosely with the push rods and give it a revolution or two and look at the clay to see if it hits.I have the kerosene head,which has I believe,the deepest compression chamber of all the H heads,so I can't imagine them hitting. I mean if they hit in this head,what else could they work in? So now that I have all of the pistons assembled and in and the bolt locks bent over,does anyone think I have anything to worry about? Should I try the clay test? Thanks,Joe
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