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Author Topic:   Header tube size & Holley 7448
istock59
Member
posted June 16, 2003 01:29 PM
Due to an upper a-arm bending and crushing two header tubes, we've got to replace our headers soon. I seem to recall that I've read somewhere that an 1.5" tube should be used with the small Holley carb (350cfm). Something about the small tube making more torque, I beleive.

Can anybody tell me if that's true?

Thanks.

Monster
Member
posted June 16, 2003 08:20 PM
I think it is more a question of the smaller diameter header being better suited for the entire combination that you must use(to be competitive) with that tiny carb. The whole combo is geared toward maximum torque, with an upper rpm limit of 6000 or so. I'm more familiar with the 1 5/8ths tube diameter for that application. Small and long.


stockcar5
Member
posted June 16, 2003 10:17 PM
i'd go with shoenfeld 1 1/2-1 5/8 step tube header. this would work best with the 350 carb. part # is SHO 184v

luke


istock59
Member
posted June 17, 2003 08:28 AM
Thanks stockcar5, that's the exact header that I was looking at. Do you use that one? How does it fit in the chassis?

I've been using the 1-5/8" Dynatech header. It fits, but I wouldn't say it's a great fit...

stockcar5
Member
posted June 17, 2003 10:19 PM
right now i have the standard 1 3/4 header cause i run at an outlaw track with big carbs. a guy i run with (same chassis) has these headers and they fit well. gotta jack the motor up a bit to get the passenger side header in though..no biggie. when i build my imca car i will be using the small step header.

luke

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