thanks to the replies i got the other day, i have decuded to go ahead and order the 3.4" mps, the removal tool and.. should i get the larger tentioner pulley or should i get the new smaller belt? also, its still pretty cold in chicago land area, can i wait till about may to get better t-stat? and .. kinda off topic... are zzp rockers a good idea? any one here have them?

First off, good choice on going with a pulley, you won't be disapointed, it is the most hp per $ mod you'll ever do. I don't know if I'm understanding you correctly, but are you buying a removal tool or renting one. If you are getting a MPS then you don't need the removal tool except to put the MPS on. Then you shouldn't need it again, so to me it seems like a waste to buy it. Renting it is much cheaper.

To start off I'd go with the larger tensioner pulley. Then if you go lower than the 3.4 you'll want to change belt sizes. The larger tensioner will provide more belt wrap around the pulley for less slipping which is why I would do that first.

As for the t-stat it won't affect your heat a noticable amount if you get one that isn't drilled so if you're worried about your heat then its not an issue. The t-stat only costs $10 so I'd just get it with the other stuff you are ordering so shipping isn't too much. Just my $.02.

For the ZZP rockers, which ones are you looking at? All of them will provide a gain. I would go with 1.9'*, but personally I don't think the extra money to get roller rockers is worth it. I'd just go with the modified stock ones. They last a long time and provide ~20whp gain. We have them in our SSEi and have had them in it for 90k miles and have had no problems at all with them. We also had them in the GTP and had no problems and then took them out and put them in the Monte Carlo and we still haven't had any problems with them in that car. I don't know how serious you plan on getting, but if you end up shifting at more than ~6100-6200rpm you'll probably want some stronger valve springs to go along with the rockers.

Hope that helps. Others will probably chime in with their opinion and anything I may have missed.

Shawn

holy crap...Thanks for all the info! im definately doing this thing now.. but ill probabl wait on the rockers expensive as hell.. ill probably have some pictures of my car the nex post thanks again for the info!!

I would have to recommend the 715 belt instead of the larger tensioner

why is that? you think it would be better?

I disagree with changing belts. The larger tensioner is the key to sufficient belt wrap as Shawn stated.

You also have th advantage of not having to remember what size belt you have on.

I'm not sure where Pat'* expertise in this is coming from. He has no experience with superchargers.

what was going on with McGraths problem then?

http://www.bonnevilleclub.com/forum/...8317&highlight

that is what i thought also

although one mentiones Idler and one mentions tensioner......

and Bill More have changed there belt than ran a different tensioner

I think Mac had a severe case of belt stretch. When I install a new belt, my 3.5" idler on the tensioner assembly nearly touches the WP (Series 1 path is different for those that don't know). After cranking the engine, they have clearance. This may be worse with the underdrive WP pulley when it goes on, but I can always drop to the 3.25" idler at the same time. I may need to to run the stock belt at that time. Mac may have also had a weak tensioner assembly.

More details on idler sizes here: http://www.bonnevilleclub.com/forum/...e=article&k=46

Pat, I've played with different belt lengths and tensioner pulley sizes as has Shawn.
We both have a great deal of experience with the L67, and speak from experience, rather than stating what others do. Some may disagree with the choice we prefer, but:

If you set it up right, the tensioner size can have a much greater effect at preventing belt slip than the belt length itself. Because MOST do one thing means they don't have belt slip, or don't know they do, or they followed someone else'* advice. But from a mechanical/physical standpoint, the oversized tensioner provides greater belt wrap around the circumference of the SC pulley that a shorter belt cannot provide in the same way.