Optimum length header primaries

[Troy]

Probably been asked before (maybe not for Chev LS engines), but is there a ball park figure on the optimum length for header primaries?

Cheers

 

[Damian]

Actually there was a whole thread in here about exhaust setups with atricles and proper equations to figure it all out. Here is the article
Auto Exhaust Science

 

[David]

You could also try playing with dimensions here:
Virtual Engine Dyno | HorsepowerCalculators.net