I have a head and intake that I ported and polished which I will be installing in a couple weeks hopefully that wakes it up more. It revs up in neutral twice as fast as it used to though. Power is a little better nothing to brag about but maybe in a few drive cycles the ecu may adapt more. I’ll take it apart in a couple days and look for marks. They fit with no modifications to the valve cover or breather tubes inside the cover. Soaked the rockes for an hour in 10w30 brake in oil then swapped out the rockers. Was shorted 2 bolts but the hardware store had 2 5/16x18x1.75 inch grade 8 Allen heads. Got these for my 97 tj 3.1l stroker four banger. 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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