Heads that only have been rebiult once need to have tappet/lifter gap checked? - Defender Source
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Old December 9th, 2011, 08:41 PM
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Question Heads that only have been rebiult once need to have tappet/lifter gap checked?

I have a set of heads taken from a 4.0 motor that I want to get rebiult. They were taken off a truck (probably high mileage) but were never rebiult until now. My understanding is that if a heads been rebiult more than once, the milling of the surface multiple times would cause too little of a gap between the tappet and the lifter thereby not allowing the valve to fully close. I know you should check the gap anyway for good measure with a welding rod but would you guys generally agree with me on this one? That if the head has only been rebiult once the gap should be within acceptable tolerance?
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Old December 10th, 2011, 08:15 AM
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Surface the heads check push rods and put it back together. I think the lobes on the cam wear faster than the rest of the valvetrain.
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Old December 14th, 2011, 02:38 PM
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Thanks, I'm going to give these heads to my buddy, he's going to rebiuld them at his shop.
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Old December 14th, 2011, 02:46 PM
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Unless you KNOW they are warped, don't resurface them. Check for warpage first. Also, you probably can get away with just cleaning up the valves and relapping. Buying new valves is stupid expensive. Install new valve guide seals too.
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Old December 14th, 2011, 03:19 PM
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Well theres some scratches on the head surface, it might not need to get milled your right, but definately a nice sanding to get it nice and smooth. Definately will use new valve guides and seals of couse, matter of fact, the seals come with a engine rebiult gasket kit, I have that. Valve guides, I will have to order them. These heads are going onto my new 4.6 short block.
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