Has anyone on the forum used any of the NOS #7515 heads that were being sold on ebay? I bought a set and received them a couple days ago. They visually look great, but I'm wondering if there's really no difference at all to our stock heads. If there's really no difference, then why the different part #'s?
Second question for anyone that's used these heads, what valves and springs did you use...stainless, sodium filled, etc,etc.?
Second question for anyone that's used these heads, what valves and springs did you use...stainless, sodium filled, etc,etc.?
