68 SS big block smoking--help!! - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 8th, 01, 05:18 PM Thread Starter
Join Date: Apr 2001
Location: monroe, nc
Posts: 8

I'm so glad to have found this site--I've got a 68 396/325, Corvette bronze, beautiful-I actually got the car from Charlie Sheen the actor-had it shipped to N.C.--!'ve got 12k on a rebuild, and I'm seeing smoke even when fully warmed up-I'm 26 years old and not a mechanic, but this is my 3rd vintage chevy and my first big block-I assume rings are my problem, but could anyone tell me what the possible causes could be, and what to do to remedy this situation--I consume a fair amount of oil, a quart every few hundred miles for sure-No leaking, really, just blowing a good bit of smoke--Thanks for any insight!
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post #2 of 3 (permalink) Old Apr 9th, 01, 07:27 PM
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Join Date: Feb 2001
Location: Concord Cal. USA
Posts: 2,664

Did you do the rebuild or was it sold as having a rebuilt motor? Did it start all of a sudden or has it slowly gotten worse? Did the motor set for a long time or have you changed anything? Unless it was a really bad rebuild modern rings are very reliable and should last much longer. That motor is not exactly a parts breaker if it stock it really does't like 5000 rpm. Let me know I will try to help you.

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post #3 of 3 (permalink) Old Apr 9th, 01, 10:24 PM
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Join Date: Dec 2000
Location: Monroe, WA, USA
Posts: 312

oger is on the money dude!, if this has been a gradual thing i bet it is just valve seal's. not ring's. ring's normaly, in my experiance happen fast. not over time.

if the car has been siting for a time every now and then it is murder on valve seal's.

they dry out and stuff when they sit and crack and let oil by.

try this, the exaust are normaly the first to go. pull the plug's and look at them if they are oil fowled i bet exaust valve seal's. intake and ring's do not always fowl out plug's but exaust seal's do. also look for oil on the plug thred's. this is a good sign of exaust vavle seal's beeing bad.

i hope this is all you have wrong. but this is where i would look first.

well i would also look at the intake gasket sealing too. but that is just as easey to check. disable and plug the PCV system and with the oil fill cap off, motor idleing, the valve cover spray some carb cleaner into the vavle cover. wait a few, and if the idle changes you have a intake leak on the inside of the motor. also spray around the intake to head area on the out side and see if the idle changes. where ever you spray and the idle change's you have a leak. now itake valve seal's beeing bad can give you the same changes in idle but it happen's rather quikly compared to manifold leak's, this is during the sparying in the valve cover. bet sure you plug the breather and PCV hole's up before you do this.

hope this help's ya out!

[This message has been edited by ilbl8 (edited 04-10-2001).]
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