If its built in your best option would be a set of 918s from comp cams.
If its built in your best option would be a set of 918s from comp cams.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Get a dental pick or something fine and sharp like that and see if you can tell if there is a separation under the washer-like area. If there is one you may be able to walk them up the valve guide a little bit at a time. They look like they're machined on there from here though.
Using a single spring out of the dual spring kit will be weaker than stock.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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