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Old 01-17-2009, 09:26 PM   #1
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Default Where to find out what bolt sizes are and where to buy them?

As the title says, where did you guys find out what bolts you needed and where did you get them from? Im not having any luck with dealers.

BTW I need bellhousing to block bolts..
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Old 01-17-2009, 09:57 PM   #2
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I got all my bolts from the Chevy dealer. I too had to purchase bell housing bolts and they are not cheep! I think I spent somewhere around $10.00 a piece and there's like 8 of them I think. GM uses weird diameter a pitch combination that you probably won't find anywhere else. I was able to find some bolts in the parts for sale forum. Try posting what you need in the parts wanted forum and wait a few days.
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Old 01-17-2009, 10:36 PM   #3
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They are just standard M10x1.5x40 METRIC bolts. You can get them anywhere. I bought a box of 25from http://www.mcmaster.com/, part number 91303A261

In fact, it is super easy to cross thread STANDARD SBC bolts into an LS block.

Ask me how I know.
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Old 01-17-2009, 10:42 PM   #4
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This is one of the great links you can find in the FAQ / Sticky...

http://www.enginepartsplus.com/pdf/P...%20Catalog.pdf
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Old 01-17-2009, 10:43 PM   #5
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Haha how do you know? J/k...Are they the same all the way around? How many will I need, 5?
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Old 01-17-2009, 10:54 PM   #6
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Quote:
Originally Posted by bczee View Post
This is one of the great links you can find in the FAQ / Sticky...

http://www.enginepartsplus.com/pdf/P...%20Catalog.pdf
Great page, but I have looked there before and have found nothing to do with bellhousing to block bolts.

mcmaster.com seems to be a good bet, how many will I need?
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Old 01-18-2009, 04:39 AM   #7
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The only odd hard to find bolt size on the LSx's are flywheel-crank bolts and head bolts. These are 11 MM.

As for everything else EXTERNAL, they will be a standard metric bolt you can find on shelf at most hardware/auto parts stores.

Lets understand the metric numbering M10x1.5x40

M10 = Diameter of bolt is approx 10 mm. Measuring with a digital caliper you may get 9.92 or something very close, round up.

1.5 = distance between each thread peak (or groove). Sometimes its easier to measure 2 threads. Then divide this by 2. So if 2 thread peaks measure 3 mm apart, divide by 2, and the pitch is 1.5

the last number (40) = 40 mm in length.
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Old 01-18-2009, 08:05 AM   #8
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I have an extra set of them actually. The BEST place to get grade 10.9 Metric bolts is any John Deere dealer or service place. I paid like $.70 each for the bell housing bolts. They had just about every ls1 bolt size except for the flywheel to crank and pressure plate bolts.
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Old 01-18-2009, 08:36 AM   #9
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Quote:
Originally Posted by Shawn MacAnanny View Post
I have an extra set of them actually. The BEST place to get grade 10.9 Metric bolts is any John Deere dealer or service place. I paid like $.70 each for the bell housing bolts. They had just about every ls1 bolt size except for the flywheel to crank and pressure plate bolts.
Good tip!

How about those flywheel and pressure plate bolts? Stuck w the dealer on those? I need them myself.
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Old 01-18-2009, 08:51 AM   #10
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I use the dies in my metric tap set. Just thread a die on the bolt, or screw the tap into the hole, if no bolt is available...
A true "dual purpose tool".
Furthermore, most good quality tap/die sets have a thread pitch gauge in them.
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Old 01-18-2009, 10:47 AM   #11
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Good info boys. So if we use bolts other than what came from GM, can we just as well throw their torque specs out of the window as well?
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Old 01-18-2009, 02:05 PM   #12
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I honestly didnt torque any of my engine bolts. I have no problems. The only thing that really matters are the rockers and the head bolts for torque specs so long as you use commong sense and blue/red thread locker where neccessary. I know i'll get flamed for saying that but torque specs can be gotten close enough by hand if you're used to the feel.
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Old 01-18-2009, 02:07 PM   #13
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Talking Yep!

"I know i'll get flamed for saying that but torque specs can be gotten close enough by hand if you're used to the feel."

+1.. I use the "1/4 turn, before it twists off", method!
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Old 01-18-2009, 02:27 PM   #14
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Im guilty as well! Oh well...Anyways, how many total bolts will I need to get my 4L60E bolted to my 05 LQ4? (besides the flexplate and torque converter bolts)
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Old 01-18-2009, 02:32 PM   #15
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Haha well i figure i reuse bolts, threads arent always the cleanes (minimal bolt corrosion, rust... etc) and other parts like headers use different bolts, different flange length clamping, different gaskets, and same as the Victor JR intake different bolts, intake thickness, really factory torque specs are designed for FACTORY bolts and FACTORY gaskets. I'm not saying dont use them I'm just saying i know that after things have been removed a few times and things have sat a while the factory torque specs really arent that much more accurate. I'd rather have it tight as i feel it needs to be with some blue thread locker. I know the bolt wont break off and it wont back out either. I've had no problems. For head gaskets though you must use torque specs and a degree wheel or just rpm bolts and the rockers must be 22ft lb with red thread locker.
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Old 01-18-2009, 02:36 PM   #16
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I think it was 8 bolts if bolting to the oil pan, 6 if not bolting to the oil pan. Or 7. I cant rememmber. I think i bought 9 incase i lost one. They were cheap from John Deere.
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Old 01-18-2009, 03:09 PM   #17
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Quote:
Originally Posted by Shawn MacAnanny View Post
I think it was 8 bolts if bolting to the oil pan, 6 if not bolting to the oil pan. Or 7. I cant rememmber. I think i bought 9 incase i lost one. They were cheap from John Deere.
But they were the same all the way around? I didnt know if the ones that go into the oil pan were different..

Not having random bolts and not having a flexplate is pretty much hoilding up my show right now ...Anyone have a flexplate with bolts for me?
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Old 01-18-2009, 04:12 PM   #18
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I think they are the same all the way around. I am using the Moroso pan though so theres no way of me telling because the transmission doesnt bolt to that pan. All of the other bolts are the same though.
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Old 05-11-2011, 06:59 PM   #19
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I went to the below link and did not see what I am looking for
http://www.enginepartsplus.com/pdf/P...%20Catalog.pdf
I'm looking for bolt sizes and thread pitches for

valley cover
starter
tbi mounting
manual flywheel to crank
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Old 05-11-2011, 09:00 PM   #20
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Alternator Rear Bracket
11515767 Bolt 1 M10x1.5x35
12556915 Bracket 1
11509666 Bolt 1 M8X1.25X50

Alternator Front
12560344 Pulley 1
11516366 Bolt 2 M10X1.5X125
12563327 Bracket 1
11516360 Bolt 1 M10X1.2X90

P/S Pump
11516697 Bolt 2
12555693 Bracket 1
11515757 Bolt 2 M8X1.25X25
12557331 Bracket 1
11515767 Bolt 3 M10x1.5x35

Compressor
12556677 Bracket 1
11516714 Bolt 2 M10X1.5X110
11515771 Bolt 6 M10X1.5X55

Starter
12561387 Bolt 2 M10x1.5x113

Main Belt Tensioner
11515768 Bolt 2 M10x1.5x50

Water Pump
12551926 Bolt 6 M8X1.25X83

Oil Pan
12554990 Bolt 2 M6X1.0X136
11515758 Bolt 13 M8X1.25X30

Motor Mount Bolts (Engine Side)
11516328 Bolt 8 M10X1.5X30

Motor Mount Through Bolts
11516940 Bolt 2 M12X1.75X160
11515744 Nut 2 M12X1.75

Motor Mount Bolts Frame Side
1638817 Bolt 8 M10X1.25X25
Nut 8 M10x1.25

Transmission Case to Engine Bolts
11516695 Bolt 8 M10X1.5X40

Torque Converter To Flexplate Bolts
11589040 Bolt 3 M10X1.5X16
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