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Old 03-06-2011, 10:12 AM
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new cam with new lifters?

Do I have to install a new cam in my 2.9 Ford V6 when installing new lifters?

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Old 03-06-2011, 10:48 AM
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New lifters on an old cam are fine, but NOT vice-versa.
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Old 03-06-2011, 11:17 AM
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Those engines are dependant on the center cam bearings for oil pressure to the lifters, so be sure you check/clean completely. If the oil clearance on these cam bearings is excessive, there can be a marked pressure loss to the upper end. Excessive oil bleed from the cam retainer can make this worse. A common "fix" for this is to install the cam retainer plate "upside down".

It is always preferred to replace the cam and lifters as a set. This is especially true on a high mileage engine. For the difference in cost, it's not worth the chance that new lifters wouldn't mate to the old cam- and if they don't, the engine will be filled w/ground up metal. Then the repair is replacing the lifters (again) AND the cam, PLUS disassembly for main/rod bearing inspection/replacement AND cleaning all the oil passages, etc. of the ground up metal.
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Old 03-06-2011, 11:32 AM
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those engine were noted for sludge. The pickup screen would plug and starve the engine enough that the lifters would start to tap. I have seen plenty that had that issue.what is the oil pressure cold, hot + hot at 2500 rpms?
Be sure to check it with a known good mechanical gauge.better know the condition before an attempted repair or you may just spin your wheels.(and spend cash you dont need to.)
What cobalt said also still applies.
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