I doon know

Is it just the crack pulley , no other pulley replacement?

How heavy is it? I wonder how much better it'd be if other pulleys like the alternator and such are lightened and enlarged also.

Hi Mike,

Have you done any timed results yet regarding your crank pulley modification? If so, what were the results? Before vs. After?

Or...are the results only measured "seat-o-pants"?

Just did mine today. Notes:

1. Easy...even I could do it.
2. Stock pulley is massive.
3. Take 3 extra minutes to remove driver-side fan, and there is PLENTY of room to work.
4. I used a torque wrench w/bar to remove bolt to check factory install and found it to be about 120 ft-lbs; if you have a new car this bolt is easy, definitely NOT a tool-breaker.
5. Improvement IS without a doubt noticeable.
6. Not a bit of dimming at idle with EVERYTHING stock turned on.

Notice more than enough spce to work with driver-side fan removed...

Add 1 hp for looking good too...

Am I nuts or is the stock pulley a combo pulley and crank harmonic damper?

sshhhh! Don't even say those words...you'll start another 10-page debate on the subject.

Oh, I did a search and can see this has been a heated debate, and I'll take it that the stocker is a balancer as well. Forget I mentioned it :)