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Old 08-17-2009, 06:07 PM   #1
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Car: 1989 IROC-Z
Engine: LO3
Transmission: 700R4
Axle/Gears: STOCK

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Official Bolt, Nut & Stud Replacement Thread

I have been buying ARP bolts the past couple of mods and have been messing up the measurements by just single pitch numbers (ARP bolts are not cheap when doing this over and over). So I wanted to start this to let everyone know what every bolt size is for our cars, as far as engine bay for now.

I will edit the list of sizes as more come in. Thanks guys for the help.

List how many for the part (headers, intake, TBI unit etc), underhead length (threads only), bolt head size, bolt thread width

Also please specify which engine the bolt came off of, I know our motors are roughly the same but you never know. I hope to soon have a complete engine bay nut and bolt ARP reference thread, with your help.

To start off. I need these below. I will also be adding my collector bolt sizes for the 2055's as well as many others once I have time (working on car right now, needing this information)

Starter Bolts (LO3 TBI)
(Stock)
xx Total Bolts
3/8-16, 4-5/8"

(MSD APS Mini)
xx Total Bolts


Ignition Coil Bracket Bolts (LO3 TBI)
(LO3 TBI)
2 Total Bolts
1 bolt is 1" with 3/4" under-head, unknown pitch and head size
1 bolt is 3/4" with 1/2" under-head, unknown pitch and head size

EGR Valve Bolts (LO3 TBI)
2 Total Bolts


Hooker 2055 Header Flange Bolts
16 Total Bolts
3/8-16, 3/4"
or
3/8-16, 1" (I verified 1" will work with Fel-Pro 1444 gaskets)

Hooker 2055 Header Collector Bolts
4 Total Bolts
7/16-14, 2"

Magnaflow 16829 Cat-Back Exhaust Bolts
1 Total Bolt
3/8-16, 1-1/4" (Please verify, have a hard time tracking threads but this is what I got)

TH-700R4 Transmission Pan Bolts
14 Total Bolts


Edelbrock 3 point Strut Tower Brace
6 Total Bolts?


Thanks guys, this will be a great thread in the coming months. Also a great reference page for needing a bolt that isn't there anymore.

P.S. I will re-organize this once it starts to fill up, I'll do it in alphabetical order.
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TGO is like a relationship, take care of it and it will take care of you.
But lie and deceive it and it will do so right back.
So lets fill this relationship (forum) with trust and companionship.
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Last edited by I H8 WWD; 08-27-2009 at 01:52 PM. Reason: Organizing/Adding
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Old 08-17-2009, 08:51 PM   #2
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Join Date: Jul 2004
Location: Calgary, AB, Canada
Posts: 10,469
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73

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Re: Official Bolt, Nut & Stud Replacement Thread

Hey WWD.

Starter bolts use a special alignment groove thing on the shank of the bolt to make sure the bolts are aligned just right. Keep in mind, if the starter is a few thought off, it'll grind. Shims will take it up or down (in relation to the ground), but with the right bolts, the starter will be lined up right WRT to the flywheel/flexplate.

The bolts are 3/8" NC, and around 3" or so. As my block was cracked in the outer hole, I did use a GR8 piece of ready-rod, and a nut. Of course this is a no-no, but I was very careful to make sure I lined it up right before tightening down the nut (ie I did this assembly with the engine on a stand, up-side-down, and the starter bendix kicked out into the flywheel.). If you are careful, you can do this method.
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355 010 block decked to .021" deck height, .020" gasket
Speedpro hyper flat tops H345
10.3:1 SCR calculated
turned stock crank - no balance job
Ohio crankshaft 5.7" 4340 rods
416 heads, 1.94" back cut/1.50", fully ported and polished. Chambers ended up at 64cc
Isky Z-25 - 1.6 SA rockers
Recurved stock distributor, with Pertronix module and coil - locked at 36* timing
modified non-cc Q-jet!!!
Edelbrock Performer RPM Q-jet intake
Retrofitted CS144 -140A alternator
Retrofitted '94 Ford Taurus electric fan with 180* fan switch
Super T-10 w/ Hurst super comp shifter. Howe hydraulic TO bearing with custom hydraulic linkage setup
Heddman 68470 headers, custom y-pipe, full 3" exhaust, dynomax ultraflo welded muffler
All new suspension, ES/Moog/KYB
Rebuilt & beefed 10 bolt rear, Detroit True-trac, 3.73 gears


Camshafts got ya confused? Read this tech article;
http://www.thirdgen.org/sbc-camshafts-primer Thanks to Apeiron for the help.
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Old 08-17-2009, 11:20 PM   #3
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Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.27

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Re: Official Bolt, Nut & Stud Replacement Thread

Anyone have any idea what size the bolts are to the dust cover on a T56?
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Old 08-17-2009, 11:47 PM   #4
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Location: Saskatoon, SK, Canada
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Car: '83 Z28, '97 Z28
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Re: Official Bolt, Nut & Stud Replacement Thread

Quote:
Originally Posted by InfernalVortex View Post
Anyone have any idea what size the bolts are to the dust cover on a T56?
Educated guess would tell me 1/4" coarse, but its probably metric on the T56.
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Old 08-18-2009, 12:05 PM   #5
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Re: Official Bolt, Nut & Stud Replacement Thread

This is what is listed for ARP Starter bolts. 2 sizes of 3.7" (about what sonix said) and 4.45 (said to be used on mini and large style starters).
Compare

Went to ARP's site and they recommend 430-3504 starter bolts which are for high torque mini starters (I'm getting the MSD APS mini starter), still would like this verified.
__________________
-Wrong Wheel Drive-
The improper displacement of power to the front wheels.


TGO is like a relationship, take care of it and it will take care of you.
But lie and deceive it and it will do so right back.
So lets fill this relationship (forum) with trust and companionship.
-I H8 WWD-

"She is not a Trailer Queen,
she is my Street Bitch
"
-I H8 WWD-

"Im not an Addict,
I'm just an OD'er"
-I H8 WWD-
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Old 09-01-2009, 10:17 AM   #6
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Join Date: Aug 2006
Location: Cleveland, Ohio
Posts: 1,767
Car: 1989 IROC-Z
Engine: LO3
Transmission: 700R4
Axle/Gears: STOCK

Classifieds Rating: (3)
Re: Official Bolt, Nut & Stud Replacement Thread

Still need some answers guys. Thanks
__________________
-Wrong Wheel Drive-
The improper displacement of power to the front wheels.


TGO is like a relationship, take care of it and it will take care of you.
But lie and deceive it and it will do so right back.
So lets fill this relationship (forum) with trust and companionship.
-I H8 WWD-

"She is not a Trailer Queen,
she is my Street Bitch
"
-I H8 WWD-

"Im not an Addict,
I'm just an OD'er"
-I H8 WWD-
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Old 09-19-2009, 10:58 AM   #7
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Car: '88 Formula Firebird
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Transmission: "World Class" T5 5-speed
Axle/Gears: 3.08 Posi

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Re: Official Bolt, Nut & Stud Replacement Thread

Header Bolts (Small-block Chevy V8)
3/8"-16, 3/4" or 1" long.
12 total

Most manufacturers say 3/4" length. And that's fine, if you don't want them to stay in.

I've paid too much money for just about every maker's special header bolts. Stainless steel with flat washers. Key locks. Expansion locks with set screws. You name it. Either they're impossible to assemble on all the holes because of the tube bends. Or they won't stay in. Either way, you get exhaust leaks. ARP claims you don't need locks, but even ARP bolts wouldn't stay tight on mine. Yes, tightened to ARP's specs.

The only header bolt lock system that WORKS is to use old-fashioned split-ring lock washers.

So get stainless steel bolts with 3/8" 6-point or 12-point heads, or Allen or Torx heads, brand of your choice. Then run down to your local hardware store and get 12 stainless steel lock washers for them. Problem solved.
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