Here's a poor pic of the dyno. Two afters and one before.
View attachment 523267
In David Vizard's book about 2 Billion 5.0 dyno tests or whatever, he notes that he *lost* 1hp form the 1.7 swap because of the stock springs. You now see some more information to back this up. I gained roughly 10 lbft accross the board with the rockers, and roughly 10rwhp peak. However with the stock springs you can see the valvetrain fall apart after 5600. The almost invisible "before" green line goes to 6000 without such trouble.
Other significant mods: Cobra intake (also in the before as well) and 4.10s (-10rwhp on dynojets generally, but on in both before and after)
Conclusion: 1.7 rockers are worth it (10rwhp/10rwtq) as a relatively easy swap, IF you swap the stock springs for something without 125k miles on them at the same time (about double the expense/work).
I put this up here because after searching all I found was supposition on these rocker's worth on a stockish 5.0
View attachment 523267
In David Vizard's book about 2 Billion 5.0 dyno tests or whatever, he notes that he *lost* 1hp form the 1.7 swap because of the stock springs. You now see some more information to back this up. I gained roughly 10 lbft accross the board with the rockers, and roughly 10rwhp peak. However with the stock springs you can see the valvetrain fall apart after 5600. The almost invisible "before" green line goes to 6000 without such trouble.
Other significant mods: Cobra intake (also in the before as well) and 4.10s (-10rwhp on dynojets generally, but on in both before and after)
Conclusion: 1.7 rockers are worth it (10rwhp/10rwtq) as a relatively easy swap, IF you swap the stock springs for something without 125k miles on them at the same time (about double the expense/work).
I put this up here because after searching all I found was supposition on these rocker's worth on a stockish 5.0