labrat Posted May 11, 2004 Share Posted May 11, 2004 Hey guys, I just got my 350 started and running, but I keep bending pushrods on two cylinders in particular. Am I just tightening the rockers too tight, or do I have a serious valve clearance problem with my vortec heads? I'm guessing that the valve is hitting the piston to bend the pushrods so badly, I'm just not sure why. Any assistance would be appreciated! Bill Quote Link to comment Share on other sites More sharing options...
80LS1T Posted May 12, 2004 Share Posted May 12, 2004 Is this a hyraulic roller lifter motor? Guy Quote Link to comment Share on other sites More sharing options...
labrat Posted May 12, 2004 Author Share Posted May 12, 2004 Naw, it's hydraulic flat tappet. Just a crane energizer 272* with about .454 lift. I think I may have tightened the rocker too tight. I'm gonna give it a compression test to make sure I didn't bend any valves and then replace the pushrods and try again. Gonna soak em overnight in oil to make sure this time. Bill Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted May 12, 2004 Share Posted May 12, 2004 I would not think you could bend them by a little over tightening. You could have clearance issues. Valves to piston clearance? Mike Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted May 12, 2004 Share Posted May 12, 2004 Are you using stock rocker arms? If so they may not be slotted enough for your cam lift, try long slot rockers, or roller rockers. You may have coil bind also, if you didn't change the springs. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted May 12, 2004 Share Posted May 12, 2004 Are you adjusting the vavles while the engine is running? I know when I adjusted mine that if I went too far the engine would almost die from having the valve misadjusted so far. I would think that if you over tightend them it would actually cause the valve to not open far enough? Am I thinking about this the right way? Guy Quote Link to comment Share on other sites More sharing options...
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