C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Block/Deck issue. Have a look....

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Old Dec 22, 2018 | 11:38 PM
  #21  
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Man...this engine is having a tough time with itself...











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Old Dec 22, 2018 | 11:45 PM
  #22  
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That’s ugly
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Old Dec 22, 2018 | 11:48 PM
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id run hylomar as per the specs which is to mate, seperate gor 15 min, then assemble.
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Old Dec 23, 2018 | 12:04 AM
  #24  
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Originally Posted by 383vett
That’s ugly
Yep. Time for a new head. It's weird that the seat appears to be cracked too.
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Old Dec 23, 2018 | 07:09 AM
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I'd offer you the set I have in the garage but they're probably just as bad.
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Old Dec 23, 2018 | 07:31 AM
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Id be putting a used engine in it.
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Old Dec 23, 2018 | 10:00 AM
  #27  
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Ha ha ha...I hear you, but that IS a used engine....that was just put in it. Bummer for the owner.
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Old Dec 23, 2018 | 10:29 AM
  #28  
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Suggest using a straight edge across the deck to insure that the deck is not low @ the problem area.
If the deck is low problems will persist.
If the deck is ok suggest exchange heads.
If concerns with coolant leaks after assembly suggest a bottle of Bars leak copper.

Good luck
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Old Dec 23, 2018 | 02:03 PM
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Originally Posted by Tom400CFI
Yep. Time for a new head. It's weird that the seat appears to be cracked too.
That looks like an iron Vortec head? What's the casting number?

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Old Dec 23, 2018 | 03:35 PM
  #30  
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It is....1997, L31 Vortec. I can look at the number when I get home. I'm at work, at the moment.
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Old Dec 23, 2018 | 11:45 PM
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THey are known to crack. Get a cheap GM crate in ther and call it a day. THey are under 2k cant go wrong.
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Old Dec 24, 2018 | 09:51 AM
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The truck is probably only worth $1500. Not my call anyway. Owner won't spend $2k on it.


Originally Posted by Hot Rod Roy
That looks like an iron Vortec head? What's the casting number?
It's the 062 casting.

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Old Dec 26, 2018 | 10:50 AM
  #33  
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Originally Posted by Tom400CFI
The truck is probably only worth $1500. Not my call anyway. Owner won't spend $2k on it.


It's the 062 casting.
Block is junk. Grab another L31 from the junkyard and swap it in.

I've gotten to the point where it's just not cost effective to fix stock SBC blocks anymore. By the time I hot tank it, sonic check it, align the mains, deck it, bore it, I'm almost at the cost of a aftermarket block that's already prepped.

-- Joe
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