FYI LS6 valvetrain measurements
01-05-2010, 09:34 PM
#11
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The oil keeps them pumped up and helps the spring in the lifter. You measure Prod length with a length checker then add in the needed pre-looad. Amount of preload needed is determined by what lifters you are using. The less preload the more power you can wring out of the motor but obviously only to a certain point before the lifter starts bouncing off the lobes. The LS7 lifters have a much stouter spring in them and the cup position is also higher up. With those lifters you can run less preload, spin more rpm and get a bit more power out of them. If you're running stock lifters I wouldnt worry about running standard length pushrods.
As far as strength on stock rods, they work just fine on a single spring setup, V8 ran his 5.3 up to 7K for over a year on stock rods and 918s.
As far as strength on stock rods, they work just fine on a single spring setup, V8 ran his 5.3 up to 7K for over a year on stock rods and 918s.
01-05-2010, 11:03 PM
#13
I'm not aware of a tool to measure pre-load "pressure", basically you use a pushrod length checker and run it up to zero lash, then add the amount of pre-load that you want to that measurement to get your pushrod length
example...pushrod length checker reads 7.35 at zero lash. You're shooting for .060 pre-load, 7.35+.060 = 7.41. Since I don't believe that there are 7.41 length pushrods, you would either have to compromise and go with a 7.4 pushrod and .050 pre-load, or get some expensive adjustable rockers to get that extra .010
example...pushrod length checker reads 7.35 at zero lash. You're shooting for .060 pre-load, 7.35+.060 = 7.41. Since I don't believe that there are 7.41 length pushrods, you would either have to compromise and go with a 7.4 pushrod and .050 pre-load, or get some expensive adjustable rockers to get that extra .010
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