Small-Bore Pontiac Engine Build - Revenge Of The 350
The stock press-fit front-oil galley plugs occasionally pop out when high-volume oil pumps are used. To prevent this, the holes are tapped to receive 3/8-inch screw-in plugs with Teflon paste. A classic mistake is to thread the plugs in so they are flush with, or below the block face. If you do this, you'll obstruct the critical oil feeds that run to the main bearings. The trick is to thread the plugs until two full threads are showing (as shown) but go no further. Don't sweat about cam sprocket interference, it clears.
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