197 cams or catcams 421

[yeecup]

I already have a set of 197 cams ready to go in my cup to be timed at 8 degrees on inlet using the tool, question is would 421s be better or would the difference be minimal, also going to run on standard ecu. cheers.

 

[JamesBryan]

Decent enough gains from 197 cams tbh.

421's need aftermarket ecu to run well, 438's are similar but can be timed using oem tool and run on stock ecu with a remap.