i put a set on my '69 coronet r/t. they lasted 25 miles. i made edelbrock take them back. i don't know if i got bad set or what. they were so ridgid the car was terrible to drive. believe it or not, they had so much gas pressure they raised the back of the car an inch or so. the top isolators on the front shocks splattered like busted tomatoes after 25 miles. you'll probably get differing opinions on this, unfortunately my opinion is negative.