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I have done the following mods this year to my '88 4+3 Z51:-
Ported heads and Exhaust manifold
Comp Cams 1.6RR
Comp Cams grind 264 cam 0.48 lift (if I remember right) + uprated springs
Roller Chain
Hardened push rods
K and N filter with Cut lid
I was hoping that this was my lot this year, but a rescent post made me think - will I need a performance chip with this lot or will I get away with tuning tweeks?