3900 flanges

[rsisbetter]

im just curious as to how thick the 3900 header flanges are in the store, it does not say in the description.

Thanks

[SappySE107]

3/8"

[G-U-NOT]

Could I use these to make headers for 3400 or 3500 heads??

[SappySE107]

Nope, they aren't the same bolt pattern.