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Message: <blockquote data-quote="Wmac" data-source="post: 1481177" data-attributes="member: 23045">2.73 gears won't take advantage of your trans or engine upgrades. Just my opinion. What ecm do you have? 5767 and 5825 are single springs with damper.  5845 is a dual coil. Sounds like you got a great deal on the heads, if you have no intension of a camshaft upgrade, why not just run them as is. Rockers of your choice. Maybe the comp cams stamped steel w/roller tip? They are economical. Valve cover clearance may become an issue with any rocker. If you have not installed them yet, I would pull at least 1 exhaust valve, Remove the spring and note and/or measure what is under them. I run an old used pair of 6037 heads. I rebuilt them with original parts. (5767 springs, 9724 retainers, 9611 locks and 9725 seals) 2 or 3 years ago. I lapped the valves, smoothed and polished the ports. They had been milled 030 before I got them. I shimmed each spring (used hardened shims) as close as possible to 1.800 height. With stock cam and 1.7 cobra pedestal rockers, it pulls strong to 5400/5500. Have stock cobra upper, self ported explorer lower, 65 mm ford racing t/b, 19# explorer injectors, canned tune to raise the limiter and change fan turn-on. With 4.10 gears and drag radials, its a hoot to drive. The above works well for me and is just my opinion. Good luck with your build.</blockquote>