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#1 |
Registered User
Join Date: Jan 2008
Location: Fort Campbell KY
Posts: 271
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Calling all big block Guru's
My brand new big block that I had built for my truck got up to 249 deg the other day only for about 5 minutes but then started smoking really bad out of the right side exhuast, So I figured that I had blow a head gasket but there was no coolant in the oil, so I take it back to the shop that built it and they tell me today that it's fine that all it did was get hot enuff to leak past the valve guides but that it's fine and has been running for 2 hours without any smoking.
Has anyone heard of this happening? And if so is it that easy?
__________________
John Bernard Books (The Shootist): "I won't be wronged, I won't be insulted, and I won't be laid a hand on. I don't do these things to other people and I expect the same from them." |
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#2 |
No No
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
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Re: Calling all big block Guru's
Going past the guides.... ahh ok... not while running, just isnt going to happen.
As far as the heat issue could have been an air pocket but its hard to say how many miles do you have on this rebuilt engine? Ive seen rebuilt engines "crate" engines do strange things had a 460 that lost compression after the customer drove from colorado to florida and back plenty of time to seat the rings. I dont remember who the engine came from but they said it happens. Ive never had it happen to an engine i built but heck followed the builders directions and drove the crap out of it compression came back up. I suggest if its fine now drive it see what happens have them document you had an issue even just a service ticket that says you took it back for inspection to cover your bases.
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1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler |
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#3 | |
Registered User
Join Date: Jan 2008
Location: Fort Campbell KY
Posts: 271
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Re: Calling all big block Guru's
Quote:
__________________
John Bernard Books (The Shootist): "I won't be wronged, I won't be insulted, and I won't be laid a hand on. I don't do these things to other people and I expect the same from them." |
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#4 |
Registered User
Join Date: Jan 2008
Location: Fort Campbell KY
Posts: 271
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Re: Calling all big block Guru's
Is it even possible that it could leak coolant pass the valve guides? Do they(valve guides) pass threw a coolant passage?
__________________
John Bernard Books (The Shootist): "I won't be wronged, I won't be insulted, and I won't be laid a hand on. I don't do these things to other people and I expect the same from them." |
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#5 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
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Re: Calling all big block Guru's
To answer both questions ^^^^^^ NO......
They likely dumped some stop-leak in it to avoid having to go back into it, Antifreeze out the exhaust and none in the crankcase is a sure sign of a blown head gasket right at a cooling passage.
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93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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#6 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
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Re: Calling all big block Guru's
What color was the smoke ? What did the smoke smell like ? As SSC's76 mentioned...... I've never seen any engine start smoking from guides then magically stop.
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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#7 |
Registered User
Join Date: Jan 2008
Location: Fort Campbell KY
Posts: 271
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Re: Calling all big block Guru's
pure white, and it smelled just like antifreeze
__________________
John Bernard Books (The Shootist): "I won't be wronged, I won't be insulted, and I won't be laid a hand on. I don't do these things to other people and I expect the same from them." |
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#8 |
Registered User
Join Date: Sep 2011
Location: Cincinnati, Ohio
Posts: 46
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Re: Calling all big block Guru's
That sucks! Its tempting to write it off as a one time thing and ignore the problem, but would be nice to know what's causing it.
Here's something that just came to mind - a machinist I know recently built a healthy street 427 for his chevelle. It would randomly run funny, smoke a little, then return to normal. Long story short, he traced it back to a rocker arm stud that had been poorly repaired - it had pulled out and was replaced, but the repair had either been drilled too deep, or it cracked the head when reinstalled...Either way it was just enough to allow coolant to seep into the cylinder at random. (have you had any port work done on your heads? hogging out ports close to the water jackets can do the same thing) |
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#9 |
Registered User
Join Date: Sep 2011
Location: Cincinnati, Ohio
Posts: 46
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Re: Calling all big block Guru's
OP, any progress?
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#10 |
No No
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
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Re: Calling all big block Guru's
well with just 3 miles on it id suspect the overheating to be just an air pocket it happens. as far as the smoke that's a hard call what would cause it then go away like mentioned above with the rocker are that was repaired those are little things that can pop up every once in a while then cause failure. I suggest take the truck out for a nice long drive follow their break in guidelines and if it it doesent happen again it could have been a fluke. if it happens again take it back or take it to someone else. I always suggest going back to the shop you went to 1st but sometimes things happen and they will try to patch it up without fixing the issue.,
__________________
1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler |
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#11 |
Registered User
Join Date: Jan 2008
Location: Fort Campbell KY
Posts: 271
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Re: Calling all big block Guru's
So the shop said that the exhaust guides go right threw the water jacket and thats why it smoked when it got hot. He said that the needed to go threw acouple oh heat cycles but since the temp jumped up fast like it did that it smoked alittle and that its nothing to worry about.
__________________
John Bernard Books (The Shootist): "I won't be wronged, I won't be insulted, and I won't be laid a hand on. I don't do these things to other people and I expect the same from them." |
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