# BLOCK GUARD

**URL:** <https://forums.speedlife.net/t/block-guard/195963>\
**Category:** PittSpeed Automotive\
**Created:** [March 7, 2008, 10:36am UTC](https://forums.speedlife.net/t/block-guard/195963 "2008-03-07T10:36:40Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![dyingwish](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dyingwish/32/6041_2.png) [@dyingwish](https://forums.speedlife.net/u/dyingwish)\
**Post date:** [March 7, 2008, 1:08pm UTC](https://forums.speedlife.net/t/block-guard/195963/3 "2008-03-07T13:08:48Z")

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> [@Any wine drinkers here?](https://forums.speedlife.net/t/any-wine-drinkers-here/26524/66):
>
> its an overly discussed/argued topic, much like underdrive pulleys.  
> the short answer is: yes, some can and will prevent the sleeves from moving/flexing/shifting. the cost of that “safety” is that they will block/slow/hinder coolant flow.
> 
> if you can’t afford to get your block sleeved, you could kick it old school and have a machinest put dowels in it
> 
> on an unrelated sidebar, if your wondering what the UDP referance is, its simple. crankshafts are designed to have a harmonic balancer to cancel out harmful vibrations and frequencies. if you remove the harmonic balancer in favor of a super light crank pulley, you are effectively re-intruducing those same harmful sonic pulses. the only acceptable solution is to have your stock crank pulley lightened or to drop a few hundred on an ATI or something.

Well stated, and yes adding UDP will allow harmful harmonic to resonate through your crank. Fluidampr makes a killer alternative to the OEM pulley. You can also shave your outer two beltways and have it balanced afterward…this leaves the OEM dampening substrate intact.

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