Doug's Headers 303Y Fitment Issue - '87 1-Ton CC

[Evil Trailblazer SS]

So I'm working on the exhaust and the driver side header does not fit. Comparing to my Dad's '83 K20 I am seeing the 3/4-ton frame is different than the 1-ton frame and the design of the headers has changed slightly.

- On my Dad's K20, the frame rail narrows up by the #1 primary whereas the 1-ton frame stays wide all the way back, only narrowing just after the #7 cylinder.

- the #3 primary on my Dad's K20 turns rearward and actually curves back toward the engine block sitting more on top of the #5 primary before it turns down to Y with the #7 primary. On my headers, the #3 primary turns straight back and carets next to the #5 primary and then turns down and cuts in to the engine to clear the frame.

The difference in the new vs. old header design would not make a difference on a 1/2 or 3/4-ton but it seems the 1-ton frame is the issue!

Can anyone else confirm this issue or has anyone installed the D303Y on a 1-ton?
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