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How precious is a 455 block/crank?? [message #324708] Sun, 08 October 2017 14:34 Go to next message
Matt Colie is currently offline  Matt Colie   United States
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Registered: March 2007
Location: S.E. Michigan
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Senior Member
I and a friend acquired a pair of rust-ball 455s. We were told be the seller (another GMC owner) that both turned over. To me that means that it could be barred through two full turns. This would be a good indicator of no serious internal damage. little.

While trying bar the crank of one so I could dismount the torque converter in preparation to putting it on a work stand, I discovered it could only go about 60°. I finally go the heads off and discovered that three cylinders are corroded and one is very badly so. I have not cleaned it up, but I would be surprised if it cleaned up at 0.030 over size.

I know I can get it apart more to pull things like the crankshaft. But I currently am wondering if that would be a waste of my time.
The heads are G and I haven't measured to see if they are big valve (2.070 as opposed to 2.000), and that intake seat might also be wasted.

Now, I would like the opinion of this forum as to if it is even worth my while to salvage other parts.

If you have an opinion based on experience, I would love to hear it.

Thank You

Matt


Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
Re: How precious is a 455 block/crank?? [message #324709 is a reply to message #324708] Sun, 08 October 2017 15:11 Go to previous messageGo to next message
tphipps is currently offline  tphipps   United States
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Registered: August 2004
Location: Spanish Fort, AL
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Senior Member
Matt, A nice boat anchor? Or, add a glass top and make a coffee table.
Tom, MS II


2012 Phoenix Cruiser model 2552 KA4CSG
Re: How precious is a 455 block/crank?? [message #324733 is a reply to message #324708] Mon, 09 October 2017 08:29 Go to previous messageGo to next message
jhbridges is currently offline  jhbridges   United States
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Registered: May 2011
Location: Braselton ga
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Senior Member
Aren't new crankshafts available, I thought I saw someplace? If so, and the b ores aren't gping to clean up, toss it.

--johnny


Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell
Re: [GMCnet] How precious is a 455 block/crank?? [message #324736 is a reply to message #324733] Mon, 09 October 2017 09:47 Go to previous message
Sammy Williams is currently offline  Sammy Williams   United States
Messages: 522
Registered: August 2010
Karma: -2
Senior Member
I'd go new. Why? less hassle with machining issues, and old age. 455
blocks, heads and cranks are readily available from aftermarket suppliers.
I'd rather have new hardware underhood than something of questionable
rebuild able quality. Granted, its your vehicle, but I'd rather err on the
side of something I can depend on.

As for performance improvement, Edelbrock makes aluminum manifolds, carbs
intakes/exhausts, basically an entire "power package" for the 455.

Sammy

On Mon, Oct 9, 2017 at 8:29 AM, Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Aren't new crankshafts available, I thought I saw someplace? If so, and
> the b ores aren't gping to clean up, toss it.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
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