Help I.D. These valve springs.....Supertech??

[boostin1234]

I bought these valve springs, Ti retainers, and seats from another member and they were listed as Supertech SR20det valve springs.

After taking my head apart I noticed that these seats do not fit over the valve seals and subsequently I'm not sure if these are for an SR20 at all? I called Supertech and ordered a new set of everything for what I needed, but If I can I would like to I.D. these if possible.

I did mention my issues to the seller and he said that Supertech makes an SR20 kit that you need to have the head machined for to accept them, true? Or are these for a different Nissan motor all together?

I know its hard to tell from the spring and retainer, but the seat is what was NOTICEABLY different in design.

Here are some pics to help....

[liquid_cool]

hummm...im no Sr expert..but i do know a few supertech products well...and supertech makes there products for exact fitment...only thing that might need machine work from them is oversize valves and high comp pistons...valves should be a drop in fit..made for the SR family...call supertech thou to verify this.