What size is a header collector for a 440?

[Dino]

I need to order a set of Percy collector gaskets but I don't know if I need these:

http://www.summitracing.com/parts/php-66002/overview/

or these:

http://www.summitracing.com/parts/php-66001/overview/

The first has an inside hole of 3" while the other is 2.5".  I 'think' I need the latter but I'm not positive and without the car here I can't check.  The exhaust is pretty stock except for the headers and they seem to be run of the mill, uncoated headers.

[justcruisin]

Most street headers have a 3" collector but its a little hard to say without seeing them, if I had to take a punt I would go for the 3".

[firefighter3931]

Unless you have a race header with 2in primary tubes the collector will be 3in

Ron

[Dino]

Thanks gents.