Fits under stock valve cover without a spacer (may require tiny modification to PCV baffle).True 1.7:1 (if you have a more aggressive cam than stock, you should consider the 1.65:1).They will fit the ’91 and newer 4.0L head, and because they are non-adjustable, they are the only known roller rocker that will fit under the stock valve cover with no additional spacers required. They provide an actual 1.7:1 ratio (over the stock 1.6:1), in addition to eliminating the loss of lift resulting from flex of the stock weak rocker arms. These rocker arms have been specifically designed in conjunction with Harland Sharp to provide the correct geometry for the AMC/Jeep inline six cylinder engine family, including the 232, 258, and 4.0L. This is a great option to squeeze more out of your stock cam, even without a supercharger. These 1.7:1 roller rockers will allow your Jeep, instead of falling on it’s face at 3800-4200rpm, to carry that out to 4600-4700rpm (right where the automatic transmission shifts at).
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