Thread: Big block valve train clatter

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bbc never had a upper end oil issues they did oil thru the rear cam with a groove in the cam journal older blocks 65/66 and not in the block under the cam bearing like the 67up that lets oil to the lifters with no groove in rear cam for upper end oil .now if some one put upper end oil restrictors that cut alot of oil down they can go in the 1/4 plugs in the back of the block or they tap the main upper oil thru the rear groove of the block. you tap the block and go under the cam bearing if a old race block it could have them if it was a soild lifter cam or soild roller cam. if that checks out then you could have bad valve train parts .you did not say much on what you have for parts ? if you have roller rockers they make some clatter if shot alot more .the steel stamp rockers get marks worn in to them for valve stems they will work in and out of lash rocker balls could be bad and pushrods worn.wrong size guide plate?? they made 5/16 .3/8 .7/16. now if you had 7/16guide plates with a 5/16 push rods ? will make upper end clatter lifter s could have junk in them ? now if you had low oil psi there could be no front plug s in front of block