March underdrive pulleys
Thread Starter
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
March underdrive pulleys
I just finished up the three piece March underdrive pulley install on my 85. No major problems with the install...other than I found the crank pulley only had two of the three outer bolts on the pulley 
, it still had the center bolt. The two outer bolts came loose VERY easy 
, The car now seems to actually charge a little higher than stock at idle.
For those of you that install the three piece set in the future, your new belt is a Goodyear #4060855 6PK2170. I started with a belt 3" shorter than stock which would have worked. But there was not much tension left if it streached, so I went another inch shorter.
We will see what this does at the track, but it will be a partial test because I should also see a gain from my custom "slim line high flow racing cat". That is another future post as soon as I finish it up, I will post some pictures
.
, it still had the center bolt. The two outer bolts came loose VERY easy , The car now seems to actually charge a little higher than stock at idle.For those of you that install the three piece set in the future, your new belt is a Goodyear #4060855 6PK2170. I started with a belt 3" shorter than stock which would have worked. But there was not much tension left if it streached, so I went another inch shorter.
We will see what this does at the track, but it will be a partial test because I should also see a gain from my custom "slim line high flow racing cat". That is another future post as soon as I finish it up, I will post some pictures
.
