V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

Bolt size for ehaust manifolt to heads.

Old Feb 6, 2003 | 09:27 PM
  #1  
91FIREBIRDGT's Avatar
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From: Riverside, CA
Car: 1991 Firebird
Engine: 3.1LV6
Transmission: 700R4
Bolt size for ehaust manifolt to heads.

What are the bolt size for these bolts? Where can i get them at? I'm gonna fix a broken bolt and I'm gonna replace all the bolts on both sides so I need to know where I can get them.
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Old Feb 6, 2003 | 09:35 PM
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85SportCoupeto89RS's Avatar
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From: Cove, Arkansas
Car: 85 Camaro SC
Engine: V6
Transmission: 700r4
M8 1.25 x 40 mm short bolt M8 1.25 x 70 mm long bolt. You need four of the 1.25 x 40 mm, and 2 1.25 x 70 mm.
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Old Feb 6, 2003 | 09:46 PM
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91FIREBIRDGT's Avatar
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From: Riverside, CA
Car: 1991 Firebird
Engine: 3.1LV6
Transmission: 700R4
thanks where can i get these at?
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Old Feb 6, 2003 | 09:48 PM
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85SportCoupeto89RS's Avatar
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From: Cove, Arkansas
Car: 85 Camaro SC
Engine: V6
Transmission: 700r4
ACE hardware, parts houses, homedepo, or any warehouse.
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Old Feb 6, 2003 | 10:55 PM
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Eh, depends on the place. Remember you want the metric equivilant of "grade 8"- and the metric equivilant is 10.9. 10.9 needs to be stamped on the bolt head.

When I dug those sizes up for us (a few years ago!), the only place that had the bolts in 10.9 strength was Pep Boys. Home/Hardware stores barely had any metric bolts, and if they did, they were stamped 8.8- the equivilant of grade 5- good for houses, not good for engines- and especially not good for exhaust work.

Make sure you also buy a tube of anti-sieze, and smear the stuff on the bolt threads before you put the new bolts in. It'll make them easier to take out next time.
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Old Feb 6, 2003 | 11:09 PM
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85SportCoupeto89RS's Avatar
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From: Cove, Arkansas
Car: 85 Camaro SC
Engine: V6
Transmission: 700r4
I got my grade 8's at ACE hardware.
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