Quick google search says Curt is right about most being iron blocks. I guess my dad got lucky with his van getting an aluminum one. More info on 5.3l block differences:
http://www.gm-trucks.com/forums/inde...pic=95383&st=0
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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