Right now, working on a 1971 GMC 1500 with a BBC 454 swap and nothing was done very well. Terry (Owner), dropped it off in April. It has been a mess to get through. These new headers were all wrong. I tried everything to make them fit. I just could not get past the hitting starter part. I am sending them back and went to Summit for some Hooker Headers. They will be in later video, when I get them.