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ok, didn't go with the Gibson's...money factor...went with schoenfeld 1302ls1.. and they fit like a glove...I have 84 c10--- I know they say 88-98 but the fit the 84...only issue I have is I have to move my o2 sensor because the gear shift linkage is hitting the 02 sensor...just going to move the bung hole...no biggie...
I see that this is an old post, but it has plenty of views to merit a response in hopes of helping future swappers. I had researched this topic earlier this year when I wanted to find affordable headers that would drop right in for my 5.3 swap. During my search I came across a company named Speed Engineering. http://www.speed-engineering.com/ They sell a bunch of LSX conversion products, specifically they sell long tube headers for the C10 LS swap. I purchased their headers and couldn't have been happier. They dropped right in without any interference or modification. Polished 304 Stainless with 3" collectors. You can buy them with either 1-3/4" or 1-7/8" primaries. Under $300. I was very impressed with the bend quality, weld quality, and fit of these headers. Check them out. Tim1981 C10 Custom Deluxe stepside5.3 Vortec (LM7)th350 automatic