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Old 04-29-2011, 03:56 PM   #1
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Accessory bracket bolts?

How important is the upper right bolt that threads into the head? I just put the accessory bracket up to my motor with brodix heads, and that threaded hole is missing? I have the 2 lower in the block and the other one in the head. I'm running the ac delete pulley if that matters, so a little less weight/stress on the bracket. At first I thought I had the passenger and drivers side heads on backwards, but the rear of the drivers head looks to be the same. I guess if I really need it, I could drill/tap the head for that bolt, but I really don't fell comfortable doing that. This build is just one complication after another.

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1996 Z28 SS clone.GMMG,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strano 1 lowering springs & swaybars,Spohn Road Race K-member with adj upper and lower A-arms,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall,strange chromemoly driveshaft. 9.2:1 383 TC78(10psi) 600hp 600ft/lbs
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Old 04-29-2011, 05:23 PM   #2
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Re: Accessory bracket bolts?

I'd say you would be missing 1/4 of the holding power for the bracket. Not ideal, IMHO.
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Old 04-29-2011, 09:38 PM   #3
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Re: Accessory bracket bolts?

I have a modified stock acc bracket that relocates the alternator down low. The guy I bought from removed that top right "horn" for the stock alternator mounting along with the hole in question - haven't had an issue yet. But the weight of the alternator isn't up top anymore either so I don't know if that would make a difference.
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Old 04-30-2011, 11:29 AM   #4
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Re: Accessory bracket bolts?

Just for informational purposes the bolts that thread into the bracket for the AC are M10 1.50 and I'm pretty the bolts into the head/block are too. I saw the PS bolt size was listed, figured it'd be good to know.

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Old 04-30-2011, 12:49 PM   #5
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Re: Accessory bracket bolts?

Quote:
Originally Posted by Bersaglieri View Post
Just for informational purposes the bolts that thread into the bracket for the AC are M10 1.50 and I'm pretty the bolts into the head/block are too. I saw the PS bolt size was listed, figured it'd be good to know.

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The bolts into the heads and block are 3/8-16. Virtually nothing going into the heads or block are metric.
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Old 04-30-2011, 10:15 PM   #6
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Re: Accessory bracket bolts?

Ah, then just the A/C mounting ones are M10 then. Not sure if you already have the info, but I have a bolt gauge and all the bolts to my motor lying around, just a thought.

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Old 04-30-2011, 11:21 PM   #7
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Re: Accessory bracket bolts?

I ended up welding a tab to the accessory bracket that lines up with one of the existing threaded holes in the head and all it solid now. Here are some pics for any future reference.

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1999 Hummer H137" tires and locker stock
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Old 05-01-2011, 08:47 AM   #8
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Re: Accessory bracket bolts?

Good deal.
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Old 05-01-2011, 10:49 AM   #9
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Re: Accessory bracket bolts?

That tab may not look very structural, but it is just as strong as the cast accessory bracket.
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1996 Z28 SS clone.GMMG,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strano 1 lowering springs & swaybars,Spohn Road Race K-member with adj upper and lower A-arms,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall,strange chromemoly driveshaft. 9.2:1 383 TC78(10psi) 600hp 600ft/lbs
1999 Hummer H137" tires and locker stock
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Old 05-01-2011, 10:49 AM
 
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