Lunati Lifters

Years back I ordered a Lunati cam and their solid lifters...
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The real narrow center worried me. I thought they would result in a loss of oil pressure so I returned them.
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Strange design....I never even slipped them in the engine but I suspected that at high lift, the oil would gush right around the middle.
Those are the original style dog bone lifters used on the slant six and A engines like the 318 poly. Lighter weight than most. Good lifter.