Sorry LR of head. Nothing to do with your current problem.
If the plug behind the timing gear is missing that is the main oil galley that feeds everything else.
Bite the bullet & pull the timing cover & the camshaft gear & you will see the problem.
Either tap the galley & install a screw in plug, or install a deep cup plug with permatex & stake the block in 3 places around the plug. To prevent it from coming out.
Did you install the main bearings correctly? Are the cam bearings installed correctly?? Best of luck.
If the plug behind the timing gear is missing that is the main oil galley that feeds everything else.
Bite the bullet & pull the timing cover & the camshaft gear & you will see the problem.
Either tap the galley & install a screw in plug, or install a deep cup plug with permatex & stake the block in 3 places around the plug. To prevent it from coming out.
Did you install the main bearings correctly? Are the cam bearings installed correctly?? Best of luck.