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I've got a friend working on a PI swap and he bought PI heads with valves and springs only. I was wondering if you can use the NPI lifters and followers in the PI heads, or does he need to buy these?
 

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I would think that the lifters and followers are the same, but you might want to call Dan or Max and have them cross the numbers.

It would probably be good to have some casting numbers available when you call. :D

Just my .02. :thumbsup:
 

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High-Mileage 4.6L Thrasher
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same parts..no difference.
JL
 
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