Had a little trouble with my Edelbrock heads when I first got them,not enough flat surface on the exhaust ports to seal the headers,kept blowing header gaskets as soon as the engine was fired,call Edelbrock,and they where great,pulled them off,they picked them up,remachined the exhaust flanges on the outside of the head and sent them back with all new gaskets at no charge to me!!! A definite upgrade to the double humps I was running,engine even runs cooler.Good luck with your set.Here's some before and after shots of the flange area and what happened to the header gaskets before the repairs.hopefully you don't have the same trouble I did,again Good luck,John
I've never had any problems out of mine.