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I have a 1995 Silverado Z71 4X4 with TBI.

Tiny
CRJ
  • MEMBER
  • 1995 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 2,696,248 MILES
I had a 3-inch crack beside the freeze plug on the motor block. The motor is a 350 5.7 with throttle body. I poured water into the radiator and it can out the crack in a steady stream. I preceded to J.B. Weld the crack to seal it closed and stop the leak. This fixed the crack and the leak coming from the crack but when I pulled the plug in the bottom of the oil pan, a large amount of water came from the oil pan followed by sludged oil. Should I replace the lower intake gasket and head gasket even though there was a crack in the motor block? I am looking for the most inexpensive resolution to this problem. I plan to do the repairs myself although I am not a licensed or experienced automotive mechanic. Please keep this fact in mind as you respond. Thank you for your time.
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Tuesday, March 1st, 2011 AT 8:30 PM

9 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Did coolant freeze in engine causing crack?
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Tuesday, March 1st, 2011 AT 8:44 PM
Tiny
CRJ
  • MEMBER
  • 5 POSTS
Yes.
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Tuesday, March 1st, 2011 AT 8:45 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Likely crack in external block not only crack believe cylinder cracked also
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Tuesday, March 1st, 2011 AT 8:49 PM
Tiny
CRJ
  • MEMBER
  • 5 POSTS
Will I have to replace the motor?
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Tuesday, March 1st, 2011 AT 9:04 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Yes if oil still out of engine put water in Radiator if it comes out pan drain then yes need new block
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Tuesday, March 1st, 2011 AT 9:17 PM
Tiny
CRJ
  • MEMBER
  • 5 POSTS
Tryed your suggestion and water came immediately from oil pan drain. Would replacing just the block itself fix my problem?
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Tuesday, March 1st, 2011 AT 9:26 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
350 pretty common salvage engine best way to go
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Tuesday, March 1st, 2011 AT 9:54 PM
Tiny
CRJ
  • MEMBER
  • 5 POSTS
Are all 350 blocks the same?
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Tuesday, March 1st, 2011 AT 10:09 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Yes but don't go back more than 1990
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Wednesday, March 2nd, 2011 AT 1:44 PM

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