need some bolt sizes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nickbwilson · 05-20-2013, 09:05 AM

im looking for the bolt sizes to mount my ls1 power steering mount to my head i didnt get the bolts with my engine and cant seem to find the right size online any where

68GMCCustom · 05-20-2013, 02:41 PM

I've got it somewhere...every bolt. but, I can't find the file on my pc!

nickbwilson · 05-20-2013, 02:46 PM

i sure hope you can find it i would really appreciate the help

68GMCCustom · 05-20-2013, 04:15 PM

I have a printed copy....just need to locate it... I'll have it today

68GMCCustom · 05-20-2013, 06:29 PM

The genIII 6.0L "Thread Repair Specifications" shows the thread size in the front side of the head (and they don't list the rear) all to be the same, being M10 x 1.5". Also shows maximum drill/tap depth of 28.0/20.0mm or 1.10"/0.787".

Seems I remember some bolts from the accessory bracket bolting to the middle or bottom of the front of the block. If you need specific holes...let me know and I'll double check.... but what I'm seeing is specs of either M8 x 1.25" or M10 x 1.5" for all holes....mostly M8 x 1.25" tho.

Now.........keep this in mind...these are bolt hole thread repair specs! Not the "bolt" specs. So I'd imagine you need to factor this in to the overall length of each bolt you need. You certainly DON'T want to bottom out a bolt.

Not seeing "accessory bracket" torque specs....but M8's look to be 18-22ft lb. and the M10's 37 ft lbs.... but could be different for accessory bracket/p.s. bolts.

Use this information at your own discretion...not responsible for damages should something be other then what I have listed and something break or fall off.

Hope this helps!

nickbwilson · 05-21-2013, 08:25 AM

68GMCCustom thanks a lot for the information i will check the bolt sizes tonight

05-20-2013, 09:05 AM	#1
nickbwilson Registered User Join Date: Apr 2008 Location: columbus indiana Posts: 86	need some bolt sizes im looking for the bolt sizes to mount my ls1 power steering mount to my head i didnt get the bolts with my engine and cant seem to find the right size online any where

05-20-2013, 02:41 PM	#2
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: need some bolt sizes I've got it somewhere...every bolt. but, I can't find the file on my pc! __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

05-20-2013, 02:46 PM	#3
nickbwilson Registered User Join Date: Apr 2008 Location: columbus indiana Posts: 86	Re: need some bolt sizes i sure hope you can find it i would really appreciate the help

05-20-2013, 04:15 PM	#4
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: need some bolt sizes I have a printed copy....just need to locate it... I'll have it today __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

05-20-2013, 06:29 PM	#5
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: need some bolt sizes The genIII 6.0L "Thread Repair Specifications" shows the thread size in the front side of the head (and they don't list the rear) all to be the same, being M10 x 1.5". Also shows maximum drill/tap depth of 28.0/20.0mm or 1.10"/0.787". Seems I remember some bolts from the accessory bracket bolting to the middle or bottom of the front of the block. If you need specific holes...let me know and I'll double check.... but what I'm seeing is specs of either M8 x 1.25" or M10 x 1.5" for all holes....mostly M8 x 1.25" tho. Now.........keep this in mind...these are bolt hole thread repair specs! Not the "bolt" specs. So I'd imagine you need to factor this in to the *overall length* of each bolt you need. You certainly DON'T want to bottom out a bolt. Not seeing "accessory bracket" torque specs....but M8's look to be 18-22ft lb. and the M10's 37 ft lbs.... but could be different for accessory bracket/p.s. bolts. Use this information at your own discretion...not responsible for damages should something be other then what I have listed and something break or fall off. Hope this helps! __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken Last edited by 68GMCCustom; 05-20-2013 at 06:36 PM.

05-21-2013, 08:25 AM	#6
nickbwilson Registered User Join Date: Apr 2008 Location: columbus indiana Posts: 86	Re: need some bolt sizes 68GMCCustom thanks a lot for the information i will check the bolt sizes tonight



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