What "size" are These B&B Headers

[Gordo2]

Folks,

Looking for some clarification on B&B header sizes.

Understand B&B made 1 5/8" and 1 3/4" headers, with the 1 5/8" header preferred for a 3.2L engine.

Are B&B header sizes based upon the outside diameter (O.D) of the primary tubes, or inside diameter (I.D)?

What size are the headers in the following pictures (same header measured from OD and ID points):

OD measurement of primary shows 1 3/4"



ID measurement shows 1.610" (1.625" = 1 5/8")



Thanks,
Gordo

[Bill Verburg]

Originally Posted by Gordo2

Folks,

Looking for some clarification on B&B header sizes.

Understand B&B made 1 5/8" and 1 3/4" headers, with the 1 5/8" header preferred for a 3.2L engine.

Are B&B header sizes based upon the outside diameter (O.D) of the primary tubes, or inside diameter (I.D)?

What size are the headers in the following pictures (same header measured from OD and ID points):

OD measurement of primary shows 1 3/4"



ID measurement shows 1.610" (1.625" = 1 5/8")



Thanks,
Gordo

For B&B 1 3/4" OD is 1 5/8" ID

the above are 1 5/8" and probably have the correct for a 3.2 round heat inlets

[Gordo2]

Originally Posted by Bill Verburg

For B&B 1 3/4" OD is 1 5/8" ID

the above are 1 5/8" and probably have the correct for a 3.2 round heat inlets

Thanks Bill,

Not sure I'm following though - I thought B&B specified header sizes based on OD of the primaries. If that's the case, wouldn't the above headers be specified as the B&B 1 3/4" version?

Also, in this thread Header Pipe Thicknesses, What are you running? you said that B&B headers come in 2 sizes: 1 5/8" OD and 1 3/4 OD.

Lastly, if these aren't B&B's 1 3/4" headers - then what is the primary OD on the 1 3/4" versions?

Thanks again,

Gordo

[Bill Verburg]

Originally Posted by Gordo2

Thanks Bill,

Not sure I'm following though - I thought B&B specified header sizes based on OD of the primaries. If that's the case, wouldn't the above headers be specified as the B&B 1 3/4" version?

Also, in this thread Header Pipe Thicknesses, What are you running? you said that B&B headers come in 2 sizes: 1 5/8" OD and 1 3/4 OD.

Lastly, if these aren't B&B's 1 3/4" headers - then what is the primary OD on the 1 3/4" versions?

Thanks again,

Gordo

You're right, I answered too early in the AM. I just checked the measurements on mine which are 1.75" OD and 1 5/8" ID, the same as those.