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John/CT · 09-20-2017, 08:29 AM

Last week we had a customer’s new Snyder’s 5.5:1 head shipped directly to the machine shop. We were there when the machinist opened the UPS box. The spark plug holes were tapped to a taper and had to be re-tapped so the plugs will seat properly. The stud bosses were different heights and had to be milled to make them even. The block mating surface of the head was out of flatness too and had to be milled. The first .001 pass contacted about 30% of the surface. Snyder’s recommended gasket may have taken up the difference temporarily, but our club does a lot of touring and, with proper maintenance and periodic adjustments, the engine should be expected to last 30,000 miles.

09-20-2017, 08:29 AM	#19
John/CT Member Join Date: May 2010 Location: Eastern Connecticut Posts: 50	Re: New hi compression heads Last week we had a customer’s new Snyder’s 5.5:1 head shipped directly to the machine shop. We were there when the machinist opened the UPS box. The spark plug holes were tapped to a taper and had to be re-tapped so the plugs will seat properly. The stud bosses were different heights and had to be milled to make them even. The block mating surface of the head was out of flatness too and had to be milled. The first .001 pass contacted about 30% of the surface. Snyder’s recommended gasket may have taken up the difference temporarily, but our club does a lot of touring and, with proper maintenance and periodic adjustments, the engine should be expected to last 30,000 miles.