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Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
ChrisS
Jedi Knight
Offline
I’m getting ready to assemble a warmed up 1275 and wanted to know what others have experienced with Isky valve springs. I purchased the up rated 260#/inch (VWE-005 / SP-006) springs but when I went to check assembled spring tension they were about 5# less than stock. I compared the uncompressed height of the stock and Isky springs and the Isky springs are shorter. Now I know that for a given lift the higher spring rate springs will give more tension, but should I be concerned with the closed valve spring tension? Is it possible / practical to put a shim under the spring cup to increase the closed valve tension or will this cause the springs to bind (stock rockers)? Am I over analyzing? Thanks.
