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79 Monterey gm350 questions

GAS engine, transmission and generator repair and maintenance discussion forum.
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Thomask702
Scurvy Dog
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Posts: 2
Joined: August 17th, 2025, 9:28 pm
Vessel Info: 1979 Carver Monterey - 25'
- Volvo Penta 280
- GM 5.7l (350) SN 3970010
Location: Cathlamet, WA
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79 Monterey gm350 questions

Postby Thomask702 » August 17th, 2025, 9:55 pm

Having trouble finding out if my engine is a 2 bolt or 4 bolt main, and was wondering if someone with a similar vessel could help with that.

Also, I'm fairly certain she needs a new oil pan and am not sure if I should get a standard or an aluminum model. She seems to be sucking bilge water (leak fixed) into the oil and leaking oil into the bilge. I was told it was a freeze plug but that didn't make sense to me.

Can I spin the engine around without removing the drive shaft? Or is it just much work to do it either way? Anything else I should do while I'm down there?

Any and all help and advice is greatly appreciated.

Best

-Thomas
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1979 Carver Monterey - 25'
- Volvo Penta 280
- GM 5.7l (350) SN 3970010

Elochoman Slough Marina


Canada
Viper
CYO Supporter
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Posts: 6195
Joined: July 10th, 2015, 9:58 pm
Vessel Info: 1989 Carver 3807 Aft Cabin
Location: Ontario, Canada
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Re: 79 Monterey gm350 questions

Postby Viper » August 18th, 2025, 7:24 am

Looks like she's a sterndrive application. The boat has to come out of the water, drive has to be removed, then you can remove the engine to get to the pan.

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