should i change my base timing after major mods on a 91 tpi z28 and if so what would be a good base? thank for any help

 

Timing's iffy... Play around with it until you can get the best results. There's no "magic number" of timing, it's different for every engine.



------------------
89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else