# Mirror bore

**URL:** <https://community.cartalk.com/t/mirror-bore/176932>\
**Category:** General Discussion\
**Created:** [May 19, 2021, 3:38pm UTC](https://community.cartalk.com/t/mirror-bore/176932 "2021-05-19T15:38:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Hugemoth\_144444](https://avatars.discourse-cdn.com/v4/letter/h/ee7513/32.png) [@Hugemoth\_144444](https://community.cartalk.com/u/Hugemoth_144444)\
**Post date:** [May 19, 2021, 3:38pm UTC](https://community.cartalk.com/t/mirror-bore/176932/1 "2021-05-19T15:38:35Z")

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What is the consensus on “mirror bore”? That is a process that instead of using steel cylinder liner inserts uses a spray on steel coating in the aluminum block. Haven’t heard of any drawbacks except a rebore isn’t possible.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [May 19, 2021, 3:43pm UTC](https://community.cartalk.com/t/mirror-bore/176932/2 "2021-05-19T15:43:05Z")

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Beats the heck out of the high-silicon aluminum bore. Solves the problem of liners coming loose and it is cheaper than the cast-in-place liners. Helps heat transfer, too. I am all for it.

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**Author:** ![FoDaddy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/fodaddy/32/717_2.png) [@FoDaddy](https://community.cartalk.com/u/FoDaddy)\
**Post date:** [May 19, 2021, 4:12pm UTC](https://community.cartalk.com/t/mirror-bore/176932/3 "2021-05-19T16:12:19Z")

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Sounds like the Plasma-Arc wire transfer used on the GT-350 and Gen 3 Coyotes. Staggeringly high oil consumption was a problem with those.

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [May 19, 2021, 4:28pm UTC](https://community.cartalk.com/t/mirror-bore/176932/4 "2021-05-19T16:28:15Z")

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There have been several sleeveless bore treatments for aluminum blocks, some work, some not so much (Vega, BMW’s Nikasil).