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Re: Header extensions........anybody run em?
[Re: 340man4ever]
#872592
12/06/10 12:28 AM
12/06/10 12:28 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I dont run a bolt on extension but I run the numbers through my header program and then make them that length when I build my headers 
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Re: Header extensions........anybody run em?
[Re: 340man4ever]
#872595
12/06/10 12:56 AM
12/06/10 12:56 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
My Dart weighs in the area of 3300 lbs race ready. I am running McCandless (Pro Parts) headers currently. Engine is stock stroke 440 zero decked with 915 heads (11.25 compression). Cam is DC 590. Thought the extensions might be worth exploring? 
Most headers are way to short on the collector and
too long on the primaries... you could use about 16"
from the end of the primaries to the end of the collector
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Re: Header extensions........anybody run em?
[Re: 340man4ever]
#872598
12/06/10 03:58 AM
12/06/10 03:58 AM
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Joined: Aug 2003
Posts: 43,157
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Quote:
My Dart weighs in the area of 3300 lbs race ready. I am running McCandless (Pro Parts) headers currently. Engine is stock stroke 440 zero decked with 915 heads (11.25 compression). Cam is DC 590. Thought the extensions might be worth exploring?
Every car(Mopars only  ) that I have added collector extensions on have ran faster, SB, BB or Hemi, stick or automatic trans I did find on my1963 415 HP M.W. NHRA stocker that I could add six inches primary extensions or add 12 inches of collector extensions, but not both, and get the same results  That was on a set of the older two inch Hooker race headers with 3.5 inch collectors with no collector flanges, the extensions extensions slid over the collectors try the extensions on yours, make sure their longer than you think you need and then cut them off where needed
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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for the night shift !!
