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Old 01-18-2018, 12:14 AM   #1
Helushar
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Join Date: Jan 2018
Location: salem,Missouri
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Question 69 long bed header clearance question

I recently bought a 69 long bed GMC that has been sitting for 5 years. it has a 400 small block with a t400 transmission. i need to replace the exhaust manifolds and have decided to go with headers instead.. SO my question is, since a lot of 350 parts will bold right on to a 400 will 350 long tubes bolt right up or will they have to be specific 400 headers and if they do have to be for a 400 will there be enough clearance to put on my engine.

i realize this mite be a dumb question but this is my first rebuild and regular parts guys around here cant answer this for me

ty
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Old 02-06-2018, 01:58 PM   #2
Mts67C10K20
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Location: Dowagiac Michigan
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Re: 69 long bed header clearance question

Any header for a 350 will fit your 400
Just make shure they will fit the truck
Good luck
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Old 02-11-2018, 02:28 AM   #3
71cheyennesuperlongb
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Location: Alcoa;Tn
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Re: 69 long bed header clearance question

Check on heddman mid length headers for our old trucks.They turn down halfway down the fire wall.Full length headers hang down about 3 inches below the frame.They will drag on speedbumps.If you plan on lowering your ride the full length will be a real nightmare.
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