# Heads

**URL:** <https://forums.speedlife.net/t/heads/243145>\
**Category:** Shift518 Automotive\
**Created:** [March 29, 2009, 11:15am UTC](https://forums.speedlife.net/t/heads/243145 "2009-03-29T11:15:25Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![TurboTravis](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbotravis/32/6406_2.png) [@TurboTravis](https://forums.speedlife.net/u/TurboTravis)\
**Post date:** [March 30, 2009, 2:31pm UTC](https://forums.speedlife.net/t/heads/243145/21 "2009-03-30T14:31:25Z")

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> [@Finshed Bike Pics](https://forums.speedlife.net/t/finshed-bike-pics/16425/9):
>
> if you have bad ptvc wouldnt the motor not turn over all the way? or atleast give you a hard time?

If there is physical interference, you’ll bend valves/damage pistons/etc by turning it over. The thing is though, if it clears by say .010, it’ll turn by hand but could touch when it’s running because of expansion, etc.

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