554 Casting Heads - Need Info
09-26-2009, 10:58 AM
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554 Casting Heads - Need Info I picked up a 5.3? with 554 casting heads...anybody ever run across any of these yet? Also have a 5.3 with what appears to be perimeter bolt bolt valve cover Ls1 heads...did they put this in a stock truck? Thanks for any info..
