2 hrs of idle time only as I lost interest in the project. I had these installed on a 502 in a 88 c1500. The fit was good. I’ll include a set of collectors that I made and a bag of hardware. These are basically for a 454ss. These is emissions/air pump fittings on each header tube which I plugged off. These are 683.00 new and in perfect condition. They sell a y pipe for this which is like 300.00 but I wanted true dual exhaust.

Not many choices out there for bbc headers in a gmt400.