header tubing size

[ilustfordust]

Is bigger better. What does everyone run on a steal head motor

[sj valley dave]

Obviously bigger is not better...The size depends on a lot of variables, engine size, rpm range desired, etc...No set answer, if there was they would only make about 3 sets...We had an iron 377 with DART heads and it liked 1 5/8" stepped to 1 3/4" now we have a 422 SB2.2 and they are 1 7/8" stepped to 2"...you are going to have to come up with a lot more info...

[SLM98]

Header and collector size will effect driveability of the engine with little or no power differences on the dyno.

[lovinlatemodels]

We always used straight 1 3/4 or 1 3/4 to 1 7/8 step on a 355 ci with world product heads and lg port vortech heads Bigger will kill your bottom end in the motor.