HELP PLEASE! PCM 5.8 351W GT-40 Short Block

[ColeNautique]

I would still do a leak down test it would tell you where the compression goes if low, you can tell by listening to intake exhaust and oil pan.
For example if you here the air in the intake you have a bad intake valve...
You could have a bent valve that just loosened up by running the engine.
It's a bit of a mess but you can run the engine without valve covers you can may determine where it's coming from.
Or pull the spark plug wires one by one and see if it makes a difference on a specific cylinder, don't get electrocuted.
The oil consumption is a bit strange if you have a bad piston or ring and oil gets burned that spark plug should be black.
If you buy a block I would send them all you engine numbers and pictures and let them tell that it fits. If something goes wrong you have at least some documentation.

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Thanks Peter, I'll have him do a leakdown and see what we find. And SOLID advice on buying the block. I'll have them tell me if it will fit and not the other way around. I appreciate your help.

[ColeNautique]

It is a standard (left hand) rotation engine, +1 on what Pete says a leak down will help. Say for example your rings are bad you would hear air out of say your oil cap,dip stick or pcv valve etc

Thanks Gary,

Good info in case I do end up having to buy a short block. You guys rock!

[Jonny Quest]

If you have access to an engine hoist, I would pull the engine and strip it down to short block status and take it to a good reputable engine rebuilder in So Cal. Have the heads refreshed and slap that bad boy back in the boat.

jQ

[ColeNautique]

If you have access to an engine hoist, I would pull the engine and strip it down to short block status and take it to a good reputable engine rebuilder in So Cal. Have the heads refreshed and slap that bad boy back in the boat.

jQ

Thanks! I'm hoping I'll be able to run it through the summer before having to do that but we shall see!