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Dims of my current headers

December 6th, 2009 No comments

I’m going to have to replace my headers, but I thought I would go ahead and measure my current Doug Thorley Tri-Y style headers so that Scott can see if my current ones will do in a pinch. Here are the current dims:

I first measured the primary tubes. I measured them from the top, so it’s longer than from the side or bottom, but it was the most accessible, and it’s at least consistent. I’ll list the primary tube length, which is from the non-gasket side of the flange, to the first weld joint where they go into the secondary tubes. I’ll also list the overall length, which includes the length from header gasket to collector gasket. Besides the primary tubes, I measured the other tubing on the side of the bend so that’s more neutral.

1: Primary: 11.75, OAL: 39.3
2: Primary: 9.5, OAL: 37
3: Primary: 11, OAL: 33
4: Primary: 11, OAL: 33
5: Primary: 14.25, OAL: 39
6: Primary: 14.25, OAL: 34
7: Primary: 9.25, OAL: 36.55
8: Primary: 9, OAL: 31.3

Collector Length: 5.25
Collector ID: 2.35-2.4
Primary OD: 1.5
Secondary OD: 1.75

Primary tube openings at header gasket: 1.15-1.25 W x 1.6 H

1,2 share a secondary. 2,4 also
5,7 share a secondary. 6,8 also