# 91 305 engine ?

**URL:** <https://forums.speedlife.net/t/91-305-engine/189411>\
**Category:** PittSpeed Automotive\
**Created:** [April 20, 2007, 2:45pm UTC](https://forums.speedlife.net/t/91-305-engine/189411 "2007-04-20T14:45:13Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![tom\_vito](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tom_vito/32/6000_2.png) [@tom\_vito](https://forums.speedlife.net/u/tom_vito)\
**Post date:** [April 20, 2007, 3:50pm UTC](https://forums.speedlife.net/t/91-305-engine/189411/14 "2007-04-20T15:50:39Z")

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> [@How would you go about diagnosing this problem...](https://forums.speedlife.net/t/how-would-you-go-about-diagnosing-this-problem/29575/23):
>
> Serpentine drive requires reverse rotation water pump. Standard belt drive requires forward rotation water pump. It all depends on the drive system. Serpentine belt loops back around the top of the pump requiring a reverse rotation pump.

Thanks. Was thinking that after posting, but firgued I would wait on the experts…

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