Late 97 GM changed the block design by adding oil squirters to cool the bottom of the pistons but they did not reinforce the block where this was done. late 98 production saw this rectified with reinforcing. 2000 model year trucks would never have seen the bad engine blocks.affected years were 96-98 and some early production 99 MY vehicles.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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