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General Discussion => Q & A => Topic started by: Brian on March 20, 2015, 08:26:15 AM

Title: Exhaust Manifold Bolt Length
Post by: Brian on March 20, 2015, 08:26:15 AM

Anyone have an original 65 GS 401 exhaust manifold-to-cylinder head bolt (that is not installed)?  Need to know the correct length.  Mine were rusty junk when I got my car, so I put some off-the-shelf bolts in it when I put the car together.  Trying to find some of the correct appearing black zinc bolts now and want to get the correct length. 

Title: Re: Exhaust Manifold Bolt Length
Post by: gs spoken here on March 20, 2015, 10:37:17 AM

I did the same thing and know want to get more OE bolt and put the French locks back on. Bolt I have are slightly over 1" one with lock washer is later 66 GS. I was told the early 66 GS used the same as 65 with the French locks. The bolts I have some have different letter/number on the head, some none.

Title: Re: Exhaust Manifold Bolt Length
Post by: Brian on March 20, 2015, 10:45:25 AM

This is what I have found.  Obviously will not need the washer, but the bolts look correct.  Any opinions?

http://www.ebay.com/itm/1964-72-Oldsmobile-Cutlass-V8-Exhaust-Manifold-Bolts-Washers-20pc-OEM-NOS-/370785467991?pt=Vintage_Car_Truck_Parts_Accessories&hash=item5654893e57&vxp=mtr#ht_1475wt_1154 (http://www.ebay.com/itm/1964-72-Oldsmobile-Cutlass-V8-Exhaust-Manifold-Bolts-Washers-20pc-OEM-NOS-/370785467991?pt=Vintage_Car_Truck_Parts_Accessories&hash=item5654893e57&vxp=mtr#ht_1475wt_1154)

Title: Re: Exhaust Manifold Bolt Length
Post by: Mark Ascher on March 20, 2015, 11:23:30 AM

I'll get some pics later and post them. The length in Bill's picture looks about right.
I don't think the french lock fits under the alternator bracket, so I'll yank one of those out.

Mark

Title: Re: Exhaust Manifold Bolt Length
Post by: Brian on March 20, 2015, 12:10:46 PM

I visited Tractor Supply next door over lunch break and lo and behold, the grade-5 bolts they carry are the black/dark olive color zinc!    They have them in 1" and 1.5", so I got 20 of each.   I can easily cut the 1.5" ones to 1.25" length in my lathe.