Motor Mount Bolts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71GMCStepside · 07-30-2004, 11:39 AM

Somehow, I have managed to lose my motor mount bolts. I finally bought a set of new motor mounts for my 71 yesterday, but I have no idea what size bolts I need to mount them to the block.

Can anyone help me out here please?

I have a SBC 350.

Thanks!

Tx Firefighter · 07-30-2004, 11:56 AM

to the block-- 3/8 x 3/4 long

71GMCStepside · 07-30-2004, 11:59 AM

Thanks Tx Firefighter! Any idea as to what type of threads??

Tx Firefighter · 07-30-2004, 12:00 PM

It's the course threads, I believe it's called a 3/8-16 bolt, get em 3/4 long. Or, 1 inch long and a good thick washer if you want to.

71GMCStepside · 07-30-2004, 12:01 PM

Sounds great. Thanks again

71GMCStepside · 07-30-2004, 12:03 PM

Since you're such a wealth of great information, any idea about what bolts I need to connect the motor mounts to the towers??

I'm full of questions, aren't I?

buckola · 07-30-2004, 03:53 PM

If I'm not mistaken the motor mount bolts are a 7/16-14 thread . Thats the ones that are a biotch to get at.

Tx Firefighter · 07-30-2004, 04:31 PM

Nah man, he asked for the ones that screw into the block, those are 3/8 for sure.

The one under the mount that goes through the frame stand is the one you're thinking about, it's the bigger 7/16 one.

crazy longhorn · 07-30-2004, 07:00 PM

Quote:

Originally Posted by 71GMCStepside

Since you're such a wealth of great information, any idea about what bolts I need to connect the motor mounts to the towers??

I'm full of questions, aren't I?

Yes, as already posted , the tower to mount bolts are 7/16 X 14 NC thread. 1 - 1 1/4 " long should work there, & they have a lock, & a big thick flat washer . if you still have the eng out of the truck, you will do yourself a big favor by drilling the holes in the eng stands out to 5/8"

best of luck,crazyL

71GMCStepside · 07-30-2004, 07:34 PM

Thanks everybody! I really appreciate the info

07-30-2004, 11:39 AM	#1
71GMCStepside Gettin' there Join Date: Mar 2004 Location: Houston (Richmond) Posts: 106	Motor Mount Bolts Somehow, I have managed to lose my motor mount bolts. I finally bought a set of new motor mounts for my 71 yesterday, but I have no idea what size bolts I need to mount them to the block. Can anyone help me out here please? I have a SBC 350. Thanks! __________________ [/B]71 Chevy Short Step - Ground Up Restoration In The Works, If I Live That Long...

07-30-2004, 11:56 AM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	to the block-- 3/8 x 3/4 long __________________ I'm on the Instagram- @Gearhead_Kevin

07-30-2004, 11:59 AM	#3
71GMCStepside Gettin' there Join Date: Mar 2004 Location: Houston (Richmond) Posts: 106	Thanks Tx Firefighter! Any idea as to what type of threads?? __________________ [/B]71 Chevy Short Step - Ground Up Restoration In The Works, If I Live That Long...

07-30-2004, 12:00 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	It's the course threads, I believe it's called a 3/8-16 bolt, get em 3/4 long. Or, 1 inch long and a good thick washer if you want to. __________________ I'm on the Instagram- @Gearhead_Kevin

07-30-2004, 12:01 PM	#5
71GMCStepside Gettin' there Join Date: Mar 2004 Location: Houston (Richmond) Posts: 106	Sounds great. Thanks again __________________ [/B]71 Chevy Short Step - Ground Up Restoration In The Works, If I Live That Long...

07-30-2004, 12:03 PM	#6
71GMCStepside Gettin' there Join Date: Mar 2004 Location: Houston (Richmond) Posts: 106	Since you're such a wealth of great information, any idea about what bolts I need to connect the motor mounts to the towers?? I'm full of questions, aren't I? __________________ [/B]71 Chevy Short Step - Ground Up Restoration In The Works, If I Live That Long...

07-30-2004, 03:53 PM	#7
buckola 1 Wrench / 10 Knuckles Join Date: Sep 2002 Location: Burlington Ontario Posts: 179	If I'm not mistaken the motor mount bolts are a 7/16-14 thread . Thats the ones that are a biotch to get at. __________________ 1970 GMC Custom Vortec Heads, Edelbrock Performer Intake, Crane 272 Energizer, Hedman Full Length HTC Headers 2006 Dodge Charger SRT8. 1/4 mile 13.3 1973 Z1 900 Kawasaki ( all original)

07-30-2004, 04:31 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Nah man, he asked for the ones that screw into the block, those are 3/8 for sure. The one under the mount that goes through the frame stand is the one you're thinking about, it's the bigger 7/16 one. __________________ I'm on the Instagram- @Gearhead_Kevin

07-30-2004, 07:34 PM	#10
71GMCStepside Gettin' there Join Date: Mar 2004 Location: Houston (Richmond) Posts: 106	Thanks everybody! I really appreciate the info __________________ [/B]71 Chevy Short Step - Ground Up Restoration In The Works, If I Live That Long...



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