1966 GMC 305 V6 Service
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Thought I'd post a few 305E pics since you don't see em every day.
Blew head gasket 2012. There was enough cylinder ridge to warrant rebuild. I just did head because I didn't want disabled truck in garage. Hope to complete lower half soon. |
Re: 1966 GMC 305 V6 Service
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Bronze guides, shaved heads, cleaned rockers, etc.
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Re: 1966 GMC 305 V6 Service
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verified oil flow
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Re: 1966 GMC 305 V6 Service
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I might be a weenie but those 305 V6 heads are heavy:)
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Re: 1966 GMC 305 V6 Service
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Not the best spring compressor but it worked.
DE1607 looks about right to my eyes. |
Re: 1966 GMC 305 V6 Service
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Installed and tested the heads.
Runs good; still has personality and drinks too much. I am servicing short block now. |
Re: 1966 GMC 305 V6 Service
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Opted for a short block that was rebuilt by machine shop but never installed.
To be safe I tore it down to check critical specifications. BTW: Drain the oil before flipping block. |
Re: 1966 GMC 305 V6 Service
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Crank grease was thick but still wet.
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Re: 1966 GMC 305 V6 Service
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Crankshaft is huge and weighs a ton.
Bore starts at 4.25" |
Re: 1966 GMC 305 V6 Service
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I used inside and outside micrometer to check cylinder wall clearances and bearing clearances.
These pistons have 4 ring grooves. Two pictures of oiling slot which is under oil ring. |
Re: 1966 GMC 305 V6 Service
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Pistons in 305E V6
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Re: 1966 GMC 305 V6 Service
Of course its heavy I read it weighs about 800 lbs and lucky for me it failed in the truck I got for free otherwise it wouldn't be my free truck.
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Re: 1966 GMC 305 V6 Service
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All the galley plugs came out pretty easy except the big one. Broke a 1/2" bolt. Finally came out after I melted wax into threads. looks like machine shop didn't remove rear plugs.
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Re: 1966 GMC 305 V6 Service
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This is what gets trapped in rear galley plug pockets.
There is no flow in this pocket and some don't bother to clean. Don't forget galley plug hidden by distributor; thankfully it came out w/ mild steel 5/15" square bar. |
Re: 1966 GMC 305 V6 Service
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I was starting to feel like Wilson. Can't beat a free. |
Re: 1966 GMC 305 V6 Service
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Cleaned all important threads w/ tap and die.
Dirt or burs can affect torque specs. |
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Cleaned w/ pressure washer and detergent after rag clean.
Payed attention to debris in cooling channels. |
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Failed deck blind plug may cause 305E heating issue so I replaced.
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Sharpened razor frequently to remove burrs and avoid scratches.
Made hone depth gauge w/ tape to avoid breaking stones and damaging bores. |
Re: 1966 GMC 305 V6 Service
Thanks for the write up. I have always been curious about these motors but most people say it's a boat anchor.
I know where there is a really clean 66 with this motor. The owner says he dropped a bolt down the intake manifold and it has been sitting ever since(6 years that I know of). Maybe he will sell it to me one of these days? Posted via Mobile Device |
Re: 1966 GMC 305 V6 Service
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I like the sewing machine sound of the solid lifter engine. Proved to be more durable w/ less maintenance than all our other 60's vehicles. Loves to cruise at 70mph. Satisfying torque. Not for the races though. |
Re: 1966 GMC 305 V6 Service
Such a cool write up!
You explain and show everything so well, makes me tempted to think I could do this! I am ready to see more :metal: |
Re: 1966 GMC 305 V6 Service
Very well done thread. Now how about some pics of the truck
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Re: 1966 GMC 305 V6 Service
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Measuring deep cam bearing clearances is difficult w/ inside micrometer.
Need special equipment to verify cam bore alignment. As a minimum verify lubed cam rotates w/o excessive drag and check end play. |
Re: 1966 GMC 305 V6 Service
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Cleaned cam w/ kerosene. WD40 to avoid dry spots.Assembly lubed distributor gear,bearings and lobes on first 1/4th shaft then began install. Lubed remaining bearings and lobes during install to minimize mess. Used coat hanger to balance cam.
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