so i have a blown head gasket thinking of replacing the gaskets and taking the heads to get rebuilt soon. i was thinking maybe to install a cam and all. what should i have them do to the heads to maybe get some HP gain? and also would u guys recomend pistons maybe? since im gooing to be taking it apart. i have a 2004 silverado 1500.. thnx

 

uh, what motor?

 

sorry its the 5.3

 

http://www.carcraft.com/techarticles...ine/index.html

great article. should help ya a little anyway

 

Is it the head gaskets or castech heads...

<TABLE id=post3183863 class=tborder border=0 cellSpacing=0 cellPadding=6 width="100%" align=center><TBODY><TR vAlign=top><TD style="BORDER-RIGHT: #000000 1px solid" id=td_post_3183863 class=alt1>#06-06-01-019B: Information on Gradual Coolant Loss Over Time with No Evidence of Leak Found - (Jun 12, 2007)


Subject: Information on Gradual Coolant Loss Over Time With No Evidence of Leak Found


Models: 2004-2006 Buick Rainier

2001-2006 Cadillac Escalade Models

2001-2006 Chevrolet Avalanche, Blazer, Silverado, Suburban, Tahoe, TrailBlazer Models

2001-2006 GMC Envoy, Jimmy, Sierra, Yukon Models

2001-2004 Oldsmobile Bravada

2005-2006 Saab 9-7X

with 4.8L or 5.3L VORTEC® GEN III, GEN IV V8 Engine (VINs V, T, M, B, Z -- RPOs LR4, LM7, LH6, L33, L59)




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This bulletin is being revised to include engine RPO L59. Please discard Corporate Bulletin Number 06-06-01-019A (Section 06 - Engine/Propulsion System).


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Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area.

Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head.

Important: If the cylinder head(s) are Not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss.

Refer to the following illustrations on how to identify Castech casting and/or the very specific areas of the cylinder head(s) for a coolant leak from porosity.
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