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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The rear drain is the only one, As a result of the angle a engine sits the drain area gets plugged up with sediment. You will need to dig that out. It can seem like filler as it can become quite hard.
I would be careful about drilling it out as the hole only goes in a short ways then turns up.
The hole at the center is used for the throttle pivot on some application. They are all drilled into the water jacket.
The holes do go down on the shafts.
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