Im still looking for little gains for my 7a and i recently came across a lightweight underdrive crank pulley from OBX. I was wondering if anyone felt any gains in hp after installing one of these, doesnt have to be OBX,

and how hard was installation, do u need shorter belts?

thanks

I don't believe OBX really ever made an UD pulley for the 7AFE... but ASP makes one. Do a search... you'll probably find them. Yes... you will need shorter drive belts.