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02-27-2011, 05:16 PM
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Hummer Veteran
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Join Date: Feb 2011
Posts: 115
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Header bolts - what type and size
Hi guys. I'm going to replace my headers soon, so I as wondering what bolts and what size I need. The headers don't come with any hardware, so I need to purchase some - so my question is: What size, type and where is a good place to order them online. Cheers, Indy.
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H U M M E R - H2 / yellow / Adv. package / lifted / 37" STT's - 6.0 V8
Plymouth PROWLER / red / Flowtech Red-Hots muffler
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Corvette C5 / Millennium Yellow / 6M - 5.7 V8 - sold
Corvette C5 / Nassau Blue / 6M - 5.7 V8 - sold
J E E P ZJ / 7" lift / 35" Cooper STT - sold
J E E P TJ / 7" lift /chillipepper red / 37" MTR - sold
Mustang GT / black / 5M - 4.6 V8 - sold
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02-28-2011, 08:35 PM
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Hummer Veteran
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Join Date: Feb 2011
Posts: 115
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Re: Header bolts - what type and size
I'm having a hard time finding good info on these bolts. I'm guessing they're 3/8"-16 (that's what other small block chevys use). What length should I get? 3/4"? 1"? Does anyone have a bolt lying around that you can measure?
Thanks for any help, cheers 
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H U M M E R - H2 / yellow / Adv. package / lifted / 37" STT's - 6.0 V8
Plymouth PROWLER / red / Flowtech Red-Hots muffler
------------------------------------------------------------
Corvette C5 / Millennium Yellow / 6M - 5.7 V8 - sold
Corvette C5 / Nassau Blue / 6M - 5.7 V8 - sold
J E E P ZJ / 7" lift / 35" Cooper STT - sold
J E E P TJ / 7" lift /chillipepper red / 37" MTR - sold
Mustang GT / black / 5M - 4.6 V8 - sold
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02-28-2011, 09:24 PM
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Hummer Professional
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Join Date: Feb 2003
Location: Palm Desert, CA
Posts: 470
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Re: Header bolts - what type and size
What brand of headers are you getting? Call the mfgr. and they should tell you what size to buy. There are different sizes of header flanges.
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2003 H2 Hummer, Yellow,Polished Whipple Supercharged, Dynatech long tube headers, catback,18\" Ambush w/Toyo MT\'s,lots of goodies!
Y2K Corvette Millennium Yellow Convert/Blk/Blk, B&B headers, B&B Tri-Flo\'s, H-Tech MAG,GMS MAF, RM Racing TwinFlow.
1994 Chev Suburban Blown
1970 Trans Am balanced, blueprinted, ceramic headers, etc.
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03-01-2011, 02:21 AM
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Hummer Veteran
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Join Date: Oct 2007
Location: Annapolis, MD
Posts: 123
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Re: Header bolts - what type and size
I agree with H2Bill. If a mfg is building headers for an H2 then they should be able to answer your question. Unless you have a complete dealer service manual this info will be hard to find. You might try calling a local GM dealer who still services the Hummer brand and they should be able to find the answer.
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03-01-2011, 04:32 AM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Re: Header bolts - what type and size
I have new headers being shipped to me this week, so I can check the bolts for you when they arrive. I can tell you that they are metric and the length of the bolt is very very important. Go too short and you will strip the aluminum heads. Go too long and they will also strip the threads in the aluminum before headers are tight. It's best to use the bolts made for the brand of header you are going to use.
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H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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