Thanks for the re's guys.He got new pushrods when he bought the cam and they were about 3/16" shorter than the originials and the lifters refused to pump up-so in went the originials and still no luck.
So next we got an adjustable pushrod and did a measurment and that appears like the new pushrods may be 3/64s too long.Could this be tha problem? :shruggy;
The engine is a '66 440 non decked,+30 over 10-1s ,'78 400 heads,larger of the summitt hyd. cams,non adjusdable rockers-pretty basic except the duel 4s
any other suggestions? Thanks,Dave