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stock...91-99 the valve stayed the same size..but for 2000 the increase valve size by a decen amount...and all the 60V6 heads are interchangable, so 2000+ one happen to be the best...a P&P would only yeild a 3hp gain and 1ft/lb torque...so its not worth it to get it done
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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