So….more header talk….this had me scratching my head

honestly, from reading your posts, and the tiny difference in ET/ mph, it’s hard to form much of an opinion unless you have a good number of outings under your belt, and the DA was the same.
Didn’t you just say very recently you hadn’t even been out yet this year?

I got around to making a few passes yesterday. I put 4.86 gears back in so this was the only change I did.

1.33 60’
6.16 to the 1/8
109.66 mph to the 1/8
9.75 @ 136 mph

before the big tube header,

1.39 60’
6.29 to the 1/8
107.56 to the 1/8
9.96 @ 134

there is no doubt that the bigger tube header is working. Quicker in all areas. More TQ and more HP

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