Lifters bleeding down overnight?
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Joined: Jun 2019
Posts: 84
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From: Pittsburgh, PA
Lifters bleeding down overnight?
I recently installed new heads, cam and lifters on my 74 small block. The cam is a hydraulic flat tappet from Comp Cams (XE262H) the lifters are also Comp Cams. Some of the lifters seem to bleed down overnight. I will get valvetrain noise on startup for a few seconds then they quiet down and stay quiet. The engine is running smooth and feels stronger than it ever has.
Do I have some defective lifters? Could it be too little or too much preload? I set all the rockers at 1/2 a turn past zero lash. The lifters were quiet on the first start up for break-in, and I went back through and rechecked all the preloads after break-in and everything seemed good. The engine probably only has 25miles on it since the upgrades.
Any input would be appreciated.
Do I have some defective lifters? Could it be too little or too much preload? I set all the rockers at 1/2 a turn past zero lash. The lifters were quiet on the first start up for break-in, and I went back through and rechecked all the preloads after break-in and everything seemed good. The engine probably only has 25miles on it since the upgrades.
Any input would be appreciated.
Last edited by Lamouree351; Aug 18, 2021 at 08:00 AM.
Word
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
Probably louder than what was in there before due to the XE nature of the cam. It's a high intensity lift flat tappet cam. Means the cam lobes move the lifter for less crankshaft rotation than a stock cam by a lot.
If it is worrisome try not pumping the throttle before cranking and let the oil pressure come up a bit before adding fuel and letting it start.
If it is worrisome try not pumping the throttle before cranking and let the oil pressure come up a bit before adding fuel and letting it start.
