New here.. NW Ohio 86' Sierra Classic

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SquareUp

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Nov 12, 2017
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Location
NW Ohio
First Name
Jordan
Truck Year
1986
Truck Model
2500 Sierra Classic
Engine Size
5.7 vin M
Hey all!!

I'm from NW Ohio. Sporting a Clean 1986 GMC Sierra Classic. 66,000 originial miles.

I am currently rebuilding the motor due to a worn valve guide and a leaking main seal. This is my first square body, and I'm looking forward to making it bad ass.. Upgrading horses, torque, and height. haha

Currently sitting on stock suspension, with the motor pulled.. Starting to break down the motor this week.

You must be registered for see images attach
 

Charlie

Mopar by Birth. Chevy by Choice.
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Euless, Texas
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Don
Truck Year
1974
Truck Model
Cheyenne 10 LWB
Engine Size
350/TH350/AC/4 BBL Quadrajet
:welcome: Cool start.
 

Craig 85

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Nashville, TN
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Craig
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1985
Truck Model
K30 SRW
Engine Size
454/TH-400/NP205
Welcome.
 

Old77

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Kansas City, Mo
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350/350/454
:welcome:
 

animal

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Location
Georgia
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Lee
Truck Year
1986
Truck Model
c10 silverado
Engine Size
350ish
:welcome:
 

SquareUp

Junior Member
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Location
NW Ohio
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Jordan
Truck Year
1986
Truck Model
2500 Sierra Classic
Engine Size
5.7 vin M
Bad news... valve guide is bad... block is scored really bad in number 6 with a lot of wear on the rest... new a new power plant.. any suggestions.. $1500 budget...
 

bucket

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Usually not in Ohio
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Truck Model
K5 thru K30
Engine Size
350-454
Howdy!

That sounds like very abnormal wear for only 66k. But you should be able to pull off a stock overhaul and keep it within the budget.
 

SquareUp

Junior Member
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Posts
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Location
NW Ohio
First Name
Jordan
Truck Year
1986
Truck Model
2500 Sierra Classic
Engine Size
5.7 vin M
Yeah.. I Agree. I'm not sure if the block is salvageable..

Here is a picture of the cylinder wall

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bucket

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Woah, that's a gouge for sure.
 

donnieray

Talks to dogs and trucks.
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Roanoke Rapids NC
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Donnie
Truck Year
84,85,86.
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86 C10, 84 K10 MM7 NP833 option truck, 85 K10.
Engine Size
350,355;350.
Welcome, good looking truck. I wouldn't mind rebuilding an engine for a rig in that condition. A machinist can tell you quick if that can be fixed. .030 overbore may be all it needs. Head work, pistons and the rest of the goodies are reasonably priced if you build it yourself but you are still at the cost range of a crate unit. I prefer to build my own. Good luck!
 

SquareUp

Junior Member
Joined
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Posts
20
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Location
NW Ohio
First Name
Jordan
Truck Year
1986
Truck Model
2500 Sierra Classic
Engine Size
5.7 vin M
I am very much on the fence.. This truck is spotless underneath as well. I will get some more pictures up as soon as i can. But I want to keep the original motor and trans with the truck and make this a full restore since it is in such good shape.

Downside.. I'm very new to this stuff..
 

WFO

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Location
Texas Panhandle
First Name
Dan
Truck Year
1986
Truck Model
K20
Engine Size
350
Welcome from the Texas Panhandle.
 

1973c10

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Oregon
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Don
Truck Year
1973
Truck Model
C10
Engine Size
454
Welcome aboard
 

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