I recently recieved both a Golden Eagle fuel rail and oil filter adapter, and a I have a question about the fittings they sent me. Concerning the picture below, the two fittings on the right came with the oil filter adapter - and I believe them both to be -6AN, the one on the left I'm not so sure about. It came with the fuel rail and is certianly larger than a -6AN. So my question is, what size is it?

 

 

that goes to the head if u dont already have one

 

Believe me, I'm aware of that - though thats not what I'll be using it for. My question remains the size of the fitting on the left if the two on the right are -6AN. Based on what Golden Eagle offers, it's either -8 or -10, but I want a second opinion.

 

Measure the ID in 1/16ths of an inch.

If its 10/16ths then its a -10. If its 6/16ths then its a -6 and so forth.

 

The left one looks to be -8 if so it will be 1/2" ID. -10 is 5/8" ID.