Headers

Bearmw

New Member
Messages
14
Reaction score
1
Location
Western, MA
I was under the impression that the primaries are closer to 1.5" and the collector is about 2". Does that seem too big for a mid-level 3.5?
 

Bert Poliakoff

Active Member
Site Donor
Messages
950
Reaction score
84
Location
Scottsdale, AZ
If that is so, and you can live with it,you will possibly lose some low end torque.You probably will not gain anything from the headers. Other members will chime in but my understanding is, 1 3/8 is the number for a stock motor. If you go bigger you may start to lose low end torque. SF Don?/
 

Gransin

Well-Known Member
Site Donor
Messages
1,020
Reaction score
517
Location
Vasa, Finland
Compared to the stahl headers, these ones are shorter before it reaches the collector, so I don't think you can compare the size of primaries based on just the diameter, you should also take lenght into the calculation.
It's about the total volume, but I might be wrong:)
 

Belgiumbarry

Well-Known Member
Messages
1,055
Reaction score
521
Location
Belgium
I was under the impression that the primaries are closer to 1.5" and the collector is about 2". Does that seem too big for a mid-level 3.5?
they are... if i may calculate that way : primaries 1.5 x 25.4 mm = 38.1 mm . ( outside 40 mm )
collector 2 x 25.4 mm = 50.8 mm ( outside 50 mm )
 
Top