underdrive pulleys 94 mustang gt
 

I have a 94 mustang gt with a 5.0, getting ready to install underdrive pulleys. Is the bolts that hold the crank pulley on ,backword threads? and do you need a puller,i know my 93 did not but i cant brake the bolts loose on the 94

figured it out, put car in gear, and pull emergency brake tight, and the crank will hold still. no backwords threads either.