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Old 03-25-2013, 11:09 AM   #31
Caperodder
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Default Re: 345 Rebuild

Yes, that's #3.

#3, #5 and #7 shaft stands have the holes, but only #3 (drivers side), and #7 (passenger side) have corresponding holes on the head itself. All are clogged.

The po ran the engine for me, but after 30 seconds, I told him to turn it off. Lots of engine noise. As I have been tearing this engine down, and inspecting/measuring everything, it's apparent that all the noise was in the top end. Cam, lifters, rockers etc. I could tell by the existance of a newer head gasket, and the globs of rtv, that someone had there hands on the top end. The good news is that all of the cam bearings are still intact and are not in the pan. Of course all of these components will be replaced.

Another interesting note. There are no welch plugs on the end of the shafts. There is no way that these shafts were filling with oil, and pushing their way out the top holes in the rocker shaft. I guess the "builder" thought them unimportant. The shaft itself is caked with burnt oil and carbon deposits.

-brett
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Old 03-25-2013, 05:23 PM   #32
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Default Re: 345 Rebuild

Great thread ,great pictures, makes me want to get started on my 392ic. Please keep it going .kevin
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Old 01-24-2018, 12:17 PM   #33
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Default Re: 345 Rebuild

Ok. Deep breath. Been away a long time working in a Cyber Security startup, so I haven't had much toy time.

Heads are now finished, and I'll post pics by the weekend.

I'll be back on the block by the weekend as well. Where I left off was getting proper measurements regarding the depth of the pistons in their bore, and calculating "quench".

Question is.....what happens to the intake manifold as we remove material, (maybe .030-.040") from the block? I take it that the new gaskets put the heads back at the proper height and therefore no mismatch or alignment issues?

-Brett
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Old 01-24-2018, 01:10 PM   #34
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Default Re: 345 Rebuild

I did this on my 345 block. IIRC the OEM steel shim head gaskets are .016. The modern FelPro gaskets are .040. Again IIRC there was .035 shaved from deck and the heads were surfaced .010. The intake manifold fits perfect and I think I have about 9:1 CR. Compression tests on the engine show 160 psi with a stock 345 is around 130-140 on the same gauge. The engine runs great on 87 octane fuel.
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Old 01-25-2018, 05:29 AM   #35
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Default Re: 345 Rebuild

OK. Got it!

So.....IIRC, we need the pistons to be flush or pistons slightly under or deeper, say .005 or so?

I'm about .048 deep in the hole now, (see previous pics). That, plus the .016 original shim type gasket gave me ~.064. New Felpro jacks that up to .088. I'm looking at lopping off well over .050.

What say you folks?

-Brett
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Old 01-25-2018, 12:52 PM   #36
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Default Re: 345 Rebuild

Optimum quench is considered .035-.040" on a new tight engine. By ~ .055 the quench effect is considered gone.
Zero deck to .005 in the hole would be perfect for a .040 HG. I don't recommend less than .035 on a SV.
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Old 01-25-2018, 02:13 PM   #37
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Default Re: 345 Rebuild

You mean 0 - .005 in the hole would be perfect, yes?

Nice to be working with you again Mr. Kenney!

-Brett
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Old 01-25-2018, 03:20 PM   #38
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Default Re: 345 Rebuild

Correct, that's what Robert me too. My machinist was not comfortable going that far due to intake manifold and push rod issues. While I don't have all of Roberts fancy measurement tools, with the pistons down .010 the manifold fits fine and one of the valves clacks a bit when really cold until it warms up so plenty of clearance there. My engine is running a Comp 252 cam and lifters.
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Old 01-25-2018, 03:35 PM   #39
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Default Re: 345 Rebuild

Thanks. Canít wait to get going on this again. Before I have the block decked, Iíll need to make sure Iím going to be using the stock pistons. Those measurements will happen next.

Thanks.
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Old 01-25-2018, 05:03 PM   #40
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Default Re: 345 Rebuild

Quote:
Originally Posted by Caperodder View Post
You mean 0 - .005 in the hole would be perfect, yes?

Nice to be working with you again Mr. Kenney!

-Brett
Yikes!!!! who proof read my post. Nobody. Corrected I hope.

Always check intake manifold alignment in a mock up before committing yourself. Machining the manifold is fairly easy for a shop. Donít let it cause poor decisions. Set it up right.
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Old 01-26-2018, 07:41 AM   #41
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Default Re: 345 Rebuild

Ha! .005, .050, no big deal.

-Brett
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Old 01-29-2018, 08:20 PM   #42
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Default Re: 345 Rebuild

Ha, I found 4 errors.
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Old 01-31-2018, 08:21 AM   #43
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Default Re: 345 Rebuild

I want to pick up a Flex Hone and do a very minor glaze break in the cylinders before I put the pistons back in for final measurement. What I see available is 3-3/4 or 4-1/8. With a bore of 3-7/8 will the 4-1/8 be ok?

I've only used the spring loaded stone type honers in the past vs the flex hone brush style.

Thought I'd check.

Also, what grit would be recommended? Available are: 120/180/240/.

Thanks!
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Old 01-31-2018, 10:52 AM   #44
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Default Re: 345 Rebuild

That should be OK from a diameter perspective. The hone is designed to work in a 4-1/8 bore so it is bigger than 4-1/8.

I would use the 240 for the finish hone.
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Old 01-31-2018, 11:02 AM   #45
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Default Re: 345 Rebuild

Just found a 4". I'll go with that.
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