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Tech Question
Joe Krizek, North Pole AK , 75 Dodge Power Wagon 318
I rebuilt my 318 in my four wheel drive truck. The block was hot tanked and bored 0.030" over, the crank was ground 0.010" under, and two rods were reconditioned. The Heads were casting #302 1985 swirlport closed chambered with new valve guides and hardened exhaust valve seats. The pistons are cast stock compression ratio with moly rings. I used a Comp Cam XE250 kit. My question is about the lifters. When I start the truck in the morning the lifters clatter. Also when is is up to operating temperature there still seems to be one lifter faintly clicking. Competitiom Cams said they make the same lifters for all flat Hyd cam mopars. The Comp Cam Lifters have a hole in the cup to oil the rocker assembly through the push rods. The olds lifters did not. Do I need new lifters?
Probably not. What you need to do is be sure that the lifters are operating within their design range. With any cam lobe on the base circle, the plunger should be depressed at least 0.030" but not more than 0.100". I'd be sure to check this on the one that's noisy all the time. If not within this range, you need custom length pushrods.
You shoud also be sure there's ample oil pressure.
Rick
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