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Can anyone tell me how I can id whether or not my comp 278 has the low taper lobes or not?

How can you tell if lifters are low taper or not?

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I tried to respond to your PM this morning but it says you've exceeded your PM limits, clean out your in box Try calling Comp on Monday and ask them if there lobes are standard taper or low taper and then ask them about the two different part # on those two lifters to see if you can use them with your pushrods or not. Remember the pushrod ball sizes needs to match the lifter cup sizes also, 1/4 inch ball in a 1/4 lifter cup, 5/16 and 5/16 together