Bolts/Nuts for motor stand & mounts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

COACHMEASON · 03-12-2009, 07:40 PM

Can someone help me out...I need the correct bolts for the motor stand and mount for my SBC...What is the correct size bolt? Please excuse my ignorance

Thanks
Clint

STOCKISH · 03-12-2009, 07:58 PM

Mine were 3/8 by 16. ~1 1/4 inch long.

truckintexas · 03-12-2009, 11:42 PM

You may already know this, but use only "Grade 8" bolts washers and nuts. They're made from hardened steel and can withstand a lot of force before they shear.

Tx Firefighter · 03-13-2009, 06:19 AM

You can get the grade 8 bolts, nuts, and washers from your local Tractor Supply very cheap. They sell all grade 8 hardware by the pound in bulk.

cdowns · 03-13-2009, 08:59 AM

grade 8 not really needed dont believe they came from factory// never had any problems with hardware store stainless

*b-rad* · 03-13-2009, 11:16 AM

go grade 8 that is a lot of weight hanging out there on 4 bolts

cdowns · 03-13-2009, 01:17 PM

just about zero wheight load on the motor stand bolts the whole load is gravity holding it down those bolts merely hold it in place and any torsional forces from the engine are disapeted thru the rubber in the motor mounts

Robert8096 · 03-13-2009, 02:33 PM

If you are mounting the engine on a engine stand go with the grade 8 hardware. If you are talking about it sitting in the truck then stainless is the way to go.

sneakysnake · 03-13-2009, 03:03 PM

Measure your stand bracket mount and allow about 3/4"to1" of the 3/8 #8 course thread bolt to screw onto block.

Longhorn Man · 03-13-2009, 03:55 PM

grade 8 is overkill
there's hardly any aplication on your truck that needs 8, grade 5 will do fine.
otherwise, sneakysnake is right, you have to measure the tube he circled on his photo.

mbgmike · 03-13-2009, 05:51 PM

The oem's used grade 5 because thats the grade that it needed and it saved them money. For the cost differance (pennies) I would just buy grade 8

*b-rad* · 03-13-2009, 06:08 PM

i was talking about the four bolts to mount a eng too a eng stand. I would not trust any thing but a grade 8

STOCKISH · 03-13-2009, 09:23 PM

When you said engine stand, I thought you meant the stands the engine mounts bolt to. Either way, 3/8 by 16.

crazy longhorn · 03-13-2009, 09:45 PM

Grade 5 vs 8 comes up from time to time, & you will hear many opinions on the subject......but the FACT is that the engine mount bolts,engine stand bolts, & ALL of the suspension bolts (including the front crossmember) ARE in FACT grade 8 from the FACTORY

Now those "bean counters would not have spent those extra pennies on thos fasteners if they didnt "feel" that they were needed! Most of this discussion come up on suspension parts......and dammit, every aftermarket drop kit(shackels/brackets/ect) comes furnished with grade 8 hardware. Do you need grade 8 fasteners on the engine stand for overhaul? Probably not.....but the softer bolts can strip/ buggar streads easier. IMO, the grade 8's are worth the extra cash. You will also have guys argue that the 8's are more prown to snapping under tension/shear loads.....THATS BS! The 8's will handle much more loads on both tension & shear.......crazyL

mbgmike · 03-14-2009, 10:31 AM

Quote:

Originally Posted by crazy longhorn

Grade 5 vs 8 comes up from time to time, & you will hear many opinions on the subject......but the FACT is that the engine mount bolts,engine stand bolts, & ALL of the suspension bolts (including the front crossmember) ARE in FACT grade 8 from the FACTORY

Now those "bean counters would not have spent those extra pennies on thos fasteners if they didnt "feel" that they were needed! Most of this discussion come up on suspension parts......and dammit, every aftermarket drop kit(shackels/brackets/ect) comes furnished with grade 8 hardware. Do you need grade 8 fasteners on the engine stand for overhaul? Probably not.....but the softer bolts can strip/ buggar streads easier. IMO, the grade 8's are worth the extra cash. You will also have guys argue that the 8's are more prown to snapping under tension/shear loads.....THATS BS! The 8's will handle much more loads on both tension & shear.......crazyL

THATS BS! I agree one hundred percent. If someone is really worried use some ARP bolts

03-12-2009, 07:40 PM	#1
COACHMEASON Keep On Keepin' On Join Date: Apr 2006 Location: Oklahoma Posts: 416	Bolts/Nuts for motor stand & mounts Can someone help me out...I need the correct bolts for the motor stand and mount for my SBC...What is the correct size bolt? Please excuse my ignorance Thanks Clint __________________ 07 Avalanche Z71 92 Mustang 5.0 GT (Triple White w/ 53,000 miles) 72 SWB Chevy w/ PS, AC, 350/350 Current Project ....In paint shop getting body/paint work done (Corvette Velocity Yellow)... http://67-72chevytrucks.com/vboard/s...d.php?t=157669

03-12-2009, 07:58 PM	#2
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Bolts/Nuts for motor stand & mounts Mine were 3/8 by 16. ~1 1/4 inch long. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

03-12-2009, 11:42 PM	#3
truckintexas Registered User Join Date: Jul 2004 Location: Weatherford, TX Posts: 225	Re: Bolts/Nuts for motor stand & mounts You may already know this, but use only "Grade 8" bolts washers and nuts. They're made from hardened steel and can withstand a lot of force before they shear.

03-13-2009, 06:19 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Bolts/Nuts for motor stand & mounts You can get the grade 8 bolts, nuts, and washers from your local Tractor Supply very cheap. They sell all grade 8 hardware by the pound in bulk. __________________ I'm on the Instagram- @Gearhead_Kevin

03-13-2009, 08:59 AM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Bolts/Nuts for motor stand & mounts grade 8 not really needed dont believe they came from factory// never had any problems with hardware store stainless __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-13-2009, 11:16 AM	#6
b-rad Account Suspended Join Date: Nov 2007 Location: FT STEWART GA Posts: 509	Re: Bolts/Nuts for motor stand & mounts go grade 8 that is a lot of weight hanging out there on 4 bolts

03-13-2009, 01:17 PM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Bolts/Nuts for motor stand & mounts just about zero wheight load on the motor stand bolts the whole load is gravity holding it down those bolts merely hold it in place and any torsional forces from the engine are disapeted thru the rubber in the motor mounts __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 03-13-2009 at 02:35 PM.

03-13-2009, 02:33 PM	#8
Robert8096 Registered User Join Date: Nov 2007 Location: Goose Creek SC Posts: 161	Re: Bolts/Nuts for motor stand & mounts If you are mounting the engine on a engine stand go with the grade 8 hardware. If you are talking about it sitting in the truck then stainless is the way to go.

03-13-2009, 03:03 PM	#9
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: Bolts/Nuts for motor stand & mounts Measure your stand bracket mount and allow about 3/4"to1" of the 3/8 #8 course thread bolt to screw onto block. Attached Images

03-13-2009, 03:55 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Bolts/Nuts for motor stand & mounts grade 8 is overkill there's hardly any aplication on your truck that needs 8, grade 5 will do fine. otherwise, sneakysnake is right, you have to measure the tube he circled on his photo.

03-13-2009, 05:51 PM	#11
mbgmike Registered User Join Date: Aug 2005 Location: Pasadena,Tx /Pto Pta DR Posts: 5,415	Re: Bolts/Nuts for motor stand & mounts The oem's used grade 5 because thats the grade that it needed and it saved them money. For the cost differance (pennies) I would just buy grade 8

03-13-2009, 06:08 PM	#12
b-rad Account Suspended Join Date: Nov 2007 Location: FT STEWART GA Posts: 509	Re: Bolts/Nuts for motor stand & mounts i was talking about the four bolts to mount a eng too a eng stand. I would not trust any thing but a grade 8 Last edited by b-rad; 03-13-2009 at 06:14 PM.

03-13-2009, 09:23 PM	#13
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Bolts/Nuts for motor stand & mounts When you said engine stand, I thought you meant the stands the engine mounts bolt to. Either way, 3/8 by 16. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

03-13-2009, 09:45 PM	#14
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Bolts/Nuts for motor stand & mounts Grade 5 vs 8 comes up from time to time, & you will hear many opinions on the subject......but the FACT is that the engine mount bolts,engine stand bolts, & ALL of the suspension bolts (including the front crossmember) ARE in FACT grade 8 from the FACTORY Now those "bean counters would not have spent those extra pennies on thos fasteners if they didnt "feel" that they were needed! Most of this discussion come up on suspension parts......and dammit, every aftermarket drop kit(shackels/brackets/ect) comes furnished with grade 8 hardware. Do you need grade 8 fasteners on the engine stand for overhaul? Probably not.....but the softer bolts can strip/ buggar streads easier. IMO, the grade 8's are worth the extra cash. You will also have guys argue that the 8's are more prown to snapping under tension/shear loads.....THATS BS! The 8's will handle much more loads on both tension & shear.......crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

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