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It is normal. Those are oil returns that keep the timing chain and gears lubricated.
Correct. However, Moroso used to sell a pair of press in "screens" that fit in these openings. The purpose of these, is if anything in the valvetrain "grenaded", it would help keep the debris contained. I'm not sure, however, if they still sell them.
Correct. However, Moroso used to sell a pair of press in "screens" that fit in these openings. The purpose of these, is if anything in the valvetrain "grenaded", it would help keep the debris contained. I'm not sure, however, if they still sell them.
Originally Posted by 97Z28SS
Leadfoot is correct my engine builder epoxied the screens in my block front and rear for the reasons explained by leadfoot.
I see they do still sell those as part of a kit. Front and rear screens and plugs for the return holes along the cam. I'm guessing that for a car that sees the street and does road racing I should not use the plugs?
I see they do still sell those as part of a kit. Front and rear screens and plugs for the return holes along the cam. I'm guessing that for a car that sees the street and does road racing I should not use the plugs?
For primarily street use, you're probably OK without them. But on the other hand, I don't think they're all that expensive, so if you can get your hands on them, it certainly wouldn't hurt.
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Are there supposed to be plugs here? 
