Any one running underdrive pulleys? Any noticable performance gains? Most likly im gonna get a set for my 318. I know it might run a little hotter, so im gonna throw a 180 thermostat on, and the charging system might be lower, is there any other negative efeects of these?

 

There are a few people here that run them. You might get the answer quicker, if you do a search.

 

i got one........... little bump in power mostly taking off lower power

the cons

steering frims up a little bit

head light dim at stop sign at night


i have no cooling problems

 

would it be a good time to upgrade to pullies doing the double roller chain ? been think of both ?

 

i have just the asp crank pulley. small bump in power. had it on for awhile now. no cooling issues(i have electric fan). and no charging problems unless it is let set and idle for a long period. like 10minutes. and that is only if the truck is up to temp and fan kicks on.i just have the crank pulley. i think if you were to get a whole set you wouldnt have any issues at all. donnt think i would use them if i had a huge stereo system though.

 

I am running the alternator and crank pulleys, which is the march set i love them except the amperage drop at idle and dimming of the lights...noticeable power gains though