Hello fellow b&m'rs,
Hopefully someone with a b&m 250 blower can help me out with this one. I'm switching from a glimmer/cog belt to the more commonly used serpentine belt system on my 250 blower and the tensioner assembley isn't lining up with the upper and lower pulleys now.

This is where I need your help: Can someone that either owns or has access to a b&m 250 blower please measure the length of the spacers that sit between the front of the intake manifold and the back of the tensioner plate.

I have a feeling that the spacers used to alighn the tensioner/idler pulley with the other blower pulleys are shorter for a glimmer/cog system than they are for the serpentine system.

i measured today...... i have the 16 rib belt setup BM 250 supercharger it measured 4and a 1/4 inches ..............4 1/4 .......i was wondering your reason for switching from the cog setup if you do decide to sell it shoot me a PM