R&R heater core on 1995 Chevrolet Monte Carlo

how long does it take to replace a heater core in a 1995 chev monte carlo? and do i need any special tools

2.5 to 3.5 hours depending if the vehicle has AC or not, go to http://www.autozone.com/autozone/ sign up and put in heater core then click on Repair guides the complete instructions with diagrams are here
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If you need more illustrations or help for you DIY let me know i can provide you with some help with Illustrations.