This part is the same blue, luckily it has a diff part # melted into it, so I took it up to the chevy dealer, and it's for a 301, and a 151, the nut part on the bottom is chrome, where the orig ones are black, I have 1 orig 400 one left. the guy at clean air knows it's for a 301 but tells you its for a 400, I just sent it back and the egr trans, was wrong too,I'm done w/ this guy. I would imagine other people on this forum got the same part, it came up on a thread a while back.