The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-30-2020, 01:06 AM   #1
rechinca
Senior Member
 
rechinca's Avatar
 
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 535
Scope pics of the motor, time to rebuild?

So I have the motor on a stand while I am going through my rebuilding of the front end. I finally took the time to run my scope through the cylinders. Granted it was kind of spur of the moment change in plans to pull the engine/trans so no compression or leak down test. HOWEVER...I am not encouraged by the pics you will see. Lots of carbon, what looks like a way too clean cylinder (head gasket issue I think), another with a possible burnt valve and some scoring. What do you think?
Attached Images
     
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof
rechinca is offline   Reply With Quote
Old 07-30-2020, 01:12 AM   #2
rechinca
Senior Member
 
rechinca's Avatar
 
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 535
Re: Scope pics of the motor, time to rebuild?

And for info, the block checks out to a 1972 A-body 165 HP 350. Best guess from the info on the block, it’s a 1972 2 bolt main from a Monte Carlo with an Edelbrock Performer I take and a 600cfm Edelbrock carb.
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof
rechinca is offline   Reply With Quote
Old 07-30-2020, 06:20 AM   #3
Ironangel
Senior Member
 
Ironangel's Avatar
 
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
Re: Scope pics of the motor, time to rebuild?

Run it!
__________________
Michael of the clan Hill,
"Two Seventy Two's"
71 1-ton Dually 350 4-Speed
71 C/50 Grain Truck, 350 Split-Axle 4-Speed
02 3/4 ton Express
14 Indian Chief Vintage
1952 Ford 8N, "Only Ford Allowed On The Property"
"Be American, Buy American"
Ironangel is offline   Reply With Quote
Old 07-30-2020, 08:29 AM   #4
Davidf
Registered User
 
Join Date: Nov 2014
Location: Austin
Posts: 749
Re: Scope pics of the motor, time to rebuild?

LS time
Davidf is offline   Reply With Quote
Old 07-30-2020, 09:44 AM   #5
rechinca
Senior Member
 
rechinca's Avatar
 
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 535
Re: Scope pics of the motor, time to rebuild?

Iron, I like your style. If it were still in the truck it would definitely get run!

David, I want to do an LS and have that OD, but something about the old school 3 OTT makes that hard to do. That is why I went with this truck as it was the color combo I wanted AND 3OTT. Although doing it now would be a huge advantage. Easy to explain to the wife for sure.
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof
rechinca is offline   Reply With Quote
Old 07-30-2020, 09:49 AM   #6
Ol Blue K20
Proprietor of Dale's Corner
 
Ol Blue K20's Avatar
 
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,245
Re: Scope pics of the motor, time to rebuild?

How did it run before you pulled it?
__________________
"Some Days Chickens And Some Days Feathers"

Dale
XNGH ECV Sam Brannan 1004

R.I.P. 67ChevyRedneck
R.I.P. Grumpy Old Man
R.I.P. FleetsidePaul
Ol Blue K20 is offline   Reply With Quote
Old 07-30-2020, 09:54 AM   #7
68 P.O.S.
Registered User
 
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
Re: Scope pics of the motor, time to rebuild?

I love 3OTTs too. I'd get one if I could. I'd really like to run a 5OTT like my old Nissan shop trucks had.
__________________
72 C10 lwb fleetside -stock 350/350 combo

Last edited by 68 P.O.S.; 07-30-2020 at 10:38 AM.
68 P.O.S. is offline   Reply With Quote
Old 07-30-2020, 01:17 PM   #8
HO455
Post Whore
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,351
Re: Scope pics of the motor, time to rebuild?

I'd run it. Borescope pictures can be deceiving unless you have used one a lot. It your concerned do a leakdown check. Then you'll have more information before putting the squeeze on the wallet.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 07-30-2020, 01:47 PM   #9
gmc684x4
Registered User
 
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
Re: Scope pics of the motor, time to rebuild?

Have you ran this motor any smoke does it use oil ?
Did it run good ?

I have done this several times and drove it like i stole it for several years

If it ran good run it and start saving up for a ls upgrade and drive your truck in the mean time

I am more likely to rebuild a ls motor now then a gen 1 350

In my two trucks i am working on i am putting gen 1 rollercam 350s because i have them and they run well
gmc684x4 is offline   Reply With Quote
Old 07-30-2020, 01:56 PM   #10
weim55
Registered User
 
Join Date: Jan 2017
Location: Larkspur, Colorado
Posts: 916
Re: Scope pics of the motor, time to rebuild?

All of the pictures you posted of that cylinder look excellent actually. But that is just one cylinder. If you were satisfied with the way it ran before it was pulled do a quick compression check and if it passes reseal it so it doesn’t have any oil leaks, put it back in and go. As rebuild parts in the supply chain become more and more iffiy, and good machine shops becoming more and more difficult, I advise people to stay away from rebuilds if it all possible these days.

Steve weim55 Colorado
weim55 is offline   Reply With Quote
Old 07-30-2020, 03:40 PM   #11
rechinca
Senior Member
 
rechinca's Avatar
 
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 535
Re: Scope pics of the motor, time to rebuild?

Thanks for the info guys. I should have specified a bit more. There were across several cylinders. As far as how it ran before I pulled it, it’s been sitting stationary for about 2 years! (Truck abuse and neglect I know!). As I recall, it started and ran decent but I bet I had 150 miles or less on it when ****e repair jobs by idiots made it a safety concern. Think I am going to just clean it up, new rear seal, oil pan gasket, timing chain/cover gasket and send it. I have the gaskets on hand in a trade with a friend so for that stuff I am not out money. Trans is getting new bearings and seals while it’s out.

Just to add insult to injury, found the starter had a broken ear, one bolt tight, one just laying through the bellhousing into the broken ear, and the third was missing because the bottom ear in the bellhousing was broken. Did have an almost new clutch but it was a smoked flywheel. That is at machine shop hoping to be found usable after a little grind. Just one more thing to repair.

Good news is I have a complete bellhousing attached to a 3 speed with a Hurst Indy floor shifter attached and another bellhousing with the fork attached still in my shed from a parts score last year.
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof

Last edited by rechinca; 07-30-2020 at 03:42 PM. Reason: Correcting a detail
rechinca is offline   Reply With Quote
Old 07-30-2020, 04:29 PM   #12
AllGoNoShow
Registered User
 
Join Date: Feb 2020
Location: Rochester, NY
Posts: 200
Re: Scope pics of the motor, time to rebuild?

Last year I replaced the top half of a 350 in my camaro (rebuilt 20 years ago) that had been sitting for several years (has about 25k on it). Your cylinders and carbon deposits look better than mine did and once I got mine all back together and running it didn’t smoke or leak or anything.

You won’t know for sure until you run it, but everything looks pretty good to me. SBCs are remarkably resilient.
AllGoNoShow is offline   Reply With Quote
Old 07-30-2020, 04:54 PM   #13
57taskforce
All about them K’s
 
57taskforce's Avatar
 
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,487
Re: Scope pics of the motor, time to rebuild?

Run it. The bores in mine are ridged pretty good and it still runs good, no oil consumption. I pulled the heads and had a ridge deep enough to hook with my finger nail. I didn’t touch it other than a complete reseal because my longer term project is a 6.0 swap. I don’t regret my decision at all. If the compression/leak down are decent and it’s got oil psi, send it.
__________________
Tyler
'57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888
'72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879
‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206
'98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s
57taskforce is offline   Reply With Quote
Old 07-30-2020, 08:26 PM   #14
BigBird05
Registered User
 
Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
Re: Scope pics of the motor, time to rebuild?

As a daily driver just drive it. Anything more and it needs a rebuild.
BigBird05 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:59 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com