Lifters

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 [[File:Oem hyd roller lifter expolded view.jpg|left|frame|OEM GM hydraulic roller lifter]]
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+The Cadillac CTS-V lifters, GM-88958689 (box of 16 are ~ $296.36 as of mid-2013) will not withstand excessive valve spring pressure. The Cadillac CTS-V lifters are lighter but are not able to handle high spring pressure any better than standard Chevrolet LS-7 lifters (GM-12499225, box of 16 go for $139.76 as of mid-2013). Either of these lifters are designed to be used with </= 100 lb. seat pressure and </= 300 lb. open pressure. If using more pressure with standard weight valve train components (no titanium, etc.), you are better off using aftermarket hydraulic roller lifters like Comp Cams Short Travel p/n 875 or Comp Cams p/n 15850 Short Travel hydraulic roller lifters with link bars, still made for OEM hydraulic roller blocks. These lifters use a very small preload (0.000") and the total travel is just 0.050". They require full roller rocker arms.
+GM uses the p/n 12499225 (AC Delco p/n HL-124) roller lifters as service replacements  in all Chevrolet 1991-'13 V8 engines. Don't use lifters designed for use in net lash valve trains (AC Delco p/n HL-105, GM p/n 5234670), severe engine damage can occur due to loft/pump up.
 ==How to tell a hydraulic lifter from a solid lifter==

Revision as of 18:12, 15 July 2013