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#1 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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opinions on motor situation
Here is my situation. The 400 in my 72 GMC has broke one or more oil rings. From my understanding i can drive this motor for a while but it will get worse. so long story short i need to to rebuild or swap.my options are
1.pull the motor and rebuild it! 2. My uncle has an LS3 BBC (complete motor) with 40k original miles that ran great when we pulled it he told me i can have. so i was thinking swap the 400 from my 68 LWB into the Jimmy and freshen up the BBC and drop it in the 68. Selling the 400 in the Jimmy to fund the swap (plus some goodies for the BBC) Rebuilding the 400 in the 68 was my winter project to get around 350hp and 410 ftlbs. I think that i could get that out of the BBC cheaper without sacraficing too much MPG as the 68 only gets 9 now. What yall think would be my best route?
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#2 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: opinions on motor situation
I think rebuilding the 400 would be more fun.
Btw, what indicates that there are some broken oil rings? Last edited by Alex Hayley; 10-21-2010 at 11:59 AM. |
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#3 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: opinions on motor situation
it has oil in the tail pipe, smokes when on the gas and is using a little bit of oil
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#4 | |
Champagne Taste on Beer Budget
Join Date: Dec 2008
Location: High Ridge, Missouri
Posts: 2,190
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![]() Quote:
Just a thought.
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Coming Soon: Project 1970 Country Truck |
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: opinions on motor situation
using a PVC system with no baffels in the valve covers can easily cause those symptoms
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#6 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: opinions on motor situation
i have baffels in my valve covers.and its only on the side with out the pvc valve!
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#7 |
Registered User
Join Date: May 2010
Location: Kenova, WV
Posts: 821
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Re: opinions on motor situation
I would check my oil returns in the heads and valves seals maybe bad
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#8 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: opinions on motor situation
x2 on valve seals
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#9 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: opinions on motor situation
im definitely goin to look into the valve seals but i just feel like i would have noticed them over time and not all at once??
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#10 |
Registered User
Join Date: Sep 2010
Location: victoria BC
Posts: 226
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Re: opinions on motor situation
pop it out and pull the heads, if its decent inside just ridge ream it and hone it quick and throw some berrings and seals and maybe relap the valves quick and toss it back together and put in back in. Less than a hundred in parts for cheep rings berrings and gaskets and if you hussled you could crack it off in 6 hours in and out. or out and in i guess that would be.
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#11 |
Registered User
Join Date: May 2010
Location: Kenova, WV
Posts: 821
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Re: opinions on motor situation
they are old and worn and brittle
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#12 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: opinions on motor situation
Out of curiosity, are you getting much blow by the rings or just poor oil control?
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#13 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: opinions on motor situation
well im not sure what blow by is but i have great oil pressure??? the motor was rebuilt in 02 and has around 60k miles on it?
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#14 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: opinions on motor situation
I love my ls swap.......
my crankshaft came out in 3 pieces. Slightly better motivation than using a little oil.
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#15 |
Account Suspended
Join Date: Oct 2009
Location: Sammamish, WA
Posts: 2,404
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Re: opinions on motor situation
Before you chase anything else, do a leak-down test to determine how significant the issue is and specifically what's happening.
http://www.harborfreight.com/cylinde...ter-94190.html ![]() |
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