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#1
01-16-2018, 08:52 PM
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i had dougs 1 7/8" on my 455 thats dynoed 625. Ran it at the strip and then tried hooker 2" and gained nothing in ET. The dougs fit better and easier to put the header bolts in and tighten. Dont waste your $ and time going to 2" on a 550hp motor.Id be curious if you would loose any power with 1 3/4".
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86' |
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#2
01-16-2018, 09:21 PM
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Depends on the rest of the system also. If the mufflers/tail pipes are to restrictive the larger header won't help at all. But I agree with Scott70...1-7/8" are most likely all you need.
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