Lifter Size and Bore

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Nov 1, 2011 | 06:10 PM

rpatrick

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Senior User

Joined: Jul 2005

Posts: 139

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From: Warrenton, VA

Lifter Size and Bore

I'm replacing the hyd roller lifters in my 302 and have noticed that I can get them in .874 diameter and .875 diameter. What is the stock size and what is the other size for?

You'd think this was a simple question but the searches I've done are confusing. Some places say the lifter is .875 diameter which implies that the actual bore (hole) in the block is larger.

I have also found posts that say the bore is .875 which would mean I would need the .874 lifter to get it to fit.

Thanks for your sage advice,
RP

Nov 1, 2011 | 10:17 PM

Terpfords

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Joined: Nov 2008

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That is just a 1/1000th of an inch difference, I can't imagine that will make a difference. The manufacturers must just list them funny. Just make sure the part is for the proper application.

By the way, I've never experienced a problem with my hydraulic lifters, are you just being thorough?

It's hard to beat the factory Ford lifter unless your looking for a lifter for a little more RPM. You can get a little more RPM out of the factory one by just putting less lifter pre load in it.

Nov 2, 2011 | 09:12 AM

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

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From: Ottawa, Ontario

My chiltons manual lists the standard lifter diameter as 0.874".
0.875" diameter lifters are likely only used if the bores have to be rebored due to excessive wear.