Hey guys! I recently purchased a used set of headers off eBay and now I need to know what brand they are so I can purchase a y pipe. The seller said they were hedman, bit I just want to double check. First off, they have three inch collectors with the older style three bolt flange (instead of the ball and socket).

I'm not quite sure how I should measure the primaries, but the inner diameter is around an inch and a half. I saw on summitracing.com that hedman only produces 1 5/8 primaries, but is that inner diameter or outer diameter?

There's no hedman badge on these, but there is a five stamped in-between the third and last primary on the driver side header. I can't make out the part number completely, but I can see 470 on both headers and a 74 stamped underneath.

Here's a pic of the headers:





Sorry they aren't great quality, but thanks to anyone that can help!!

 

http://www.jegs.com/i/Hedman/500/684...arentProductId=

 

Thanks! Those numbers make sense now haha