slp under drive pulley

[big hammer]

is there actual gains to be had with this? worth the $200 or is it just another TB spacer....

[suede]

well it may free up 5-10 horse, but it will help your engine climb the RPM's faster is the biggest improvement....

[clg82]

is there actual gains to be had with this? worth the $200 or is it just another TB spacer....

well it may free up 5-10 horse, but it will help your engine climb the RPM's faster is the biggest improvement....

How hard are they to install? and what exactly do they do?

[suede]

How hard are they to install? and what exactly do they do?

they are relatively easy to install, you will just need a new GM crank bolt...

but what it does is puts a smaller pulley on the end of the crankshaft so the belt that runs all your accessories will turn slower, and with a smaller pully it will have more mechanical advantage, so it will slow it down some and turn the accessories like the Power steering pump, AC, Alt, waterpump easier...

[clg82]

they are relatively easy to install, you will just need a new GM crank bolt...

but what it does is puts a smaller pulley on the end of the crankshaft so the belt that runs all your accessories will turn slower, and with a smaller pully it will have more mechanical advantage, so it will slow it down some and turn the accessories like the Power steering pump, AC, Alt, waterpump easier...

With my mod's will I notice a difference? and also how hard are they to install on a scale of 1-10? does anyone know where there is a write up on how to install one of these? and do you also have to buy new belts.....sheesh that's a lot of questions but every bit will help!!!

[suede]

With my mod's will I notice a difference? and also how hard are they to install on a scale of 1-10? does anyone know where there is a write up on how to install one of these? and do you also have to buy new belts.....sheesh that's a lot of questions but every bit will help!!!

A. Depends on how easily you notice things.....
B. 4
C. Somone correct me if im wrong, (I have not done it but follow me), set the motor at TDC on the stock pully, then remove the bolt holding it on, allign the underdrive as the stock one was and put new bolt in and torqe to spec....
D. You will use the same sized belt....

[clg82]

ummm how do i find out where TDC IS??

[suede]

there are numbers on the pulley and a pointer on the block if it is normal... somone who has done this will step in, im just using basic knowledge and guestimating

[ls1camino]

A. Depends on how easily you notice things.....
B. 4
C. Somone correct me if im wrong, (I have not done it but follow me), set the motor at TDC on the stock pully, then remove the bolt holding it on, allign the underdrive as the stock one was and put new bolt in and torqe to spec....
D. You will use the same sized belt....

You need new belts.

#K060763 (Main Belt)
#K040378 (AC Belt)

[suede]

I stand corrected....

elc you done this?

[Y2KPewterSS]

I stand corrected....

elc you done this?

I have, not SLP version though. He is correct about new belts along with the new bolt.

[suede]

I have, not SLP version though. He is correct about new belts along with the new bolt.

am i close with the install?

[Deviant LS1]

Why would you need to TDC anything at all? LS1 cranks are not keyed and are internally balanced. That would mean all crank pulley's would be zero balanced. If it's zero balanced then you can put it on any way you want.

[suede]

Why would you need to TDC anything at all? LS1 cranks are not keyed and are internally balanced. That would mean all crank pulley's would be zero balanced. If it's zero balanced then you can put it on any way you want.

Im not worried about balance, I was saying for purposes of when you need to find TDC for adjusting valves, cam install stuff like that. but i guess cam is set internally with timing chain, but just like wiht older motors where you had a distributer to adjust timing, you had to watch the numbers on the pulley..... but like i said, ours may not even have numbers all being computer controlled...

[midi_2001]

Here's SLP's instructions from their website for 1998-02 LS1 Camaro/Firebirds:
http://www.slponline.com/inst/100221.pdf

Here's SLP's instructions from their website for 1997-2006 LS1/LS6/LS2 Corvettes:
http://www.slponline.com/inst/100225.pdf

There's some information in the page as well:
http://www.ls1howto.com/index.php?article=2

'I' personally have not performed this yet, but may in the near future.

[ls1camino]

I stand corrected....

elc you done this?

Not yet, I have the pulley and the belt sitting in my garage waiting to be installed next week. I just researched the parts I'm using A LOT.

[qwk93ta]

Does anyone have the part number for the new bolt?

[clg82]

does anyone have the part number for the new bolt?

12557840

[Deviant LS1]

Im not worried about balance, I was saying for purposes of when you need to find TDC for adjusting valves, cam install stuff like that. but i guess cam is set internally with timing chain, but just like wiht older motors where you had a distributer to adjust timing, you had to watch the numbers on the pulley..... but like i said, ours may not even have numbers all being computer controlled...

There are no numbers on the crank pulley, there is no valve lash to adjust on these motors, there is no distributor to dial in timing with.....

[clg82]

There are no numbers on the crank pulley, there is no valve lash to adjust on these motors, there is no distributor to dial in timing with.....

ok...........................