Where to find out what bolt sizes are and where to buy them?
Thread Starter
Launching!
Joined: Oct 2007
Posts: 288
Likes: 0
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..
BTW I need bellhousing to block bolts..
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.
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.
In fact, it is super easy to cross thread STANDARD SBC bolts into an LS block.
Ask me how I know.
This is one of the great links you can find in the FAQ / Sticky...
http://www.enginepartsplus.com/pdf/P...%20Catalog.pdf
http://www.enginepartsplus.com/pdf/P...%20Catalog.pdf
Thread Starter
Launching!
Joined: Oct 2007
Posts: 288
Likes: 0
This is one of the great links you can find in the FAQ / Sticky...
http://www.enginepartsplus.com/pdf/P...%20Catalog.pdf
http://www.enginepartsplus.com/pdf/P...%20Catalog.pdf
mcmaster.com seems to be a good bet, how many will I need?
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.
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.
Trending Topics
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.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
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.
How about those flywheel and pressure plate bolts? Stuck w the dealer on those? I need them myself.
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.
A true "dual purpose tool".
Furthermore, most good quality tap/die sets have a thread pitch gauge in them.
Last edited by Old Geezer; Jan 18, 2009 at 10:33 AM.
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.
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!
+1.. I use the "1/4 turn, before it twists off", method!
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.
Thread Starter
Launching!
Joined: Oct 2007
Posts: 288
Likes: 0
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? 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.
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
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
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
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