So I have a 99 C5 with 114k miles currently. This will be the 3rd time I've had to change the stock OEM harmonic balancer due to it moving a 1/2 inch forward. I have read that it might be worth it to go and buy a 10-25% underdrive pulley to keep this from happening again, but wouldn't that make all the accessories run slower? Any input would be great!

 

You DO NOT want to put a stock HB back on. Will send you a PM for more info.

 

Why not post the info here - it might help others besides the OP.

 

it sounds like it's time to go for an aftermarker unit... powerbond makes a good factory replacement as well as jegs/summit

 

I sent him this all-inclusive C5 thread (pg 1-3) which includes HB discussions
http://forums.corvetteforum.com/show....php?t=1249213
HB threads @ post 33 page 2

 

Thanks guys!

 

The main thing I need to know is if my completely stock C5 is able to use a 10-25% underdrive with no issues.

 

Under drive will work just fine but you can find a good aftermarket balancer, like ATI, that is stock size. Go that route and be done with the issue.

 

And don't forget to buy an ARP bolt.....