I have a 67 289 that I have rebuilt, has a Comp Cams Xtreme Energry flat tappet hydraulic lifter cam. Has the comp cams high energy lifter kit.
Currently I have sealed power 6.801 in. pushrods in the engine. I am getting quite a bit of lifter noise from the engine. Noise is coming from both sides of the engine best I can tell. Engine runs strong, doesn’t miss or have any apparent issues aside from the noise. We have set the lifters 2 times with no change. Curious if maybe our pushrods are too short. From my research it sounds like spec for the engine is 6.825 is that correct? Being off .024 on a hydraulic lifter setup I wouldn’t think that would make much if any noise. Comp Cams recommends a heat treated (cant imagine that matters) 6.800 pushrod for the cam and lifter setup I have. The heads have been rebuilt with factory spec parts. Pushrods are not bent. So my questions
1: What size pushrods are you running?
2: Is factory spec 6.825 for pushrod length?
3: Is there a way to measure pushrod length requirements without replacing a lifter with a solid lifter?
As always any help is appreciated!
Currently I have sealed power 6.801 in. pushrods in the engine. I am getting quite a bit of lifter noise from the engine. Noise is coming from both sides of the engine best I can tell. Engine runs strong, doesn’t miss or have any apparent issues aside from the noise. We have set the lifters 2 times with no change. Curious if maybe our pushrods are too short. From my research it sounds like spec for the engine is 6.825 is that correct? Being off .024 on a hydraulic lifter setup I wouldn’t think that would make much if any noise. Comp Cams recommends a heat treated (cant imagine that matters) 6.800 pushrod for the cam and lifter setup I have. The heads have been rebuilt with factory spec parts. Pushrods are not bent. So my questions
1: What size pushrods are you running?
2: Is factory spec 6.825 for pushrod length?
3: Is there a way to measure pushrod length requirements without replacing a lifter with a solid lifter?
As always any help is appreciated!
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