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Are engine mount bolts really special??? #1733578 01/18/15 11:24 PM 01/18/15 11:24 PM
Joined: Jul 2005 Posts: 444 Loma Linda, MO 7 7812845 OP mopar
7812845 OP mopar 7 Joined: Jul 2005 Posts: 444 Loma Linda, MO	I need to locate some engine mounting bolts for my car so I thought I might just get some new ones while I'm at it. They are selling for $25 new. Am I missing something?? That sure seems like a bunch of money for them. What's so special to make them this expensive?? 2020 RAM Longhorn 4x4 2022 Jeep Grand Cherokee Overland

Re: Are engine mount bolts really special??? [Re: 7812845] #1733579 01/18/15 11:39 PM 01/18/15 11:39 PM
Joined: Apr 2010 Posts: 4,154 bethlehem pa M mikemee1331 master
mikemee1331 master M Joined: Apr 2010 Posts: 4,154 bethlehem pa	Quote: I need to locate some engine mounting bolts for my car so I thought I might just get some new ones while I'm at it. They are selling for $25 new. Am I missing something?? That sure seems like a bunch of money for them. What's so special to make them this expensive?? since i'm not a numbers guy it doesn't matter to me. I just go to the hardware store and buy hardened (grade 8) ones. then I discovered a local hardware store that has an unbelievable selection of stainless! so now when I take something apart, I replace with stainless hardware!

Re: Are engine mount bolts really special??? [Re: mikemee1331] #1733580 01/19/15 12:02 AM 01/19/15 12:02 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	If its the bolts from the mounts to the block, they are fine thread (at least on mine) which resists vibration better. Beyond that, I don't believe they are anything special. When I did mine, I used an ARP kit that was pretty reasonable in steel.

Re: Are engine mount bolts really special??? [Re: 7812845] #1733581 01/19/15 12:09 AM 01/19/15 12:09 AM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	It depends on which year bolts and mounts and body style your talking about, Hemi,YES THEY ARE expensive, what part for a Hemiroid isn't Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Are engine mount bolts really special??? [Re: 7812845] #1733582 01/19/15 12:28 AM 01/19/15 12:28 AM
Joined: Jun 2004 Posts: 893 Tustin, CA P pishta super stock
pishta super stock P Joined: Jun 2004 Posts: 893 Tustin, CA	Dont even need to be grade 8. 5 is fine and get fine pitch. The expensive ones probably have the M or factory vendor letter in them as off the line. Kinda like rosette rivets.... 12 Grand Caravan 06 T&C 02 T&C 96 Breeze 65 Barracuda "S"

Re: Are engine mount bolts really special??? [Re: pishta] #1733583 01/19/15 12:41 AM 01/19/15 12:41 AM
Joined: Jul 2005 Posts: 444 Loma Linda, MO 7 7812845 OP mopar
7812845 OP mopar 7 Joined: Jul 2005 Posts: 444 Loma Linda, MO	Poor wording on my part. I need the bolts that go thru the motor mounts to the k frame. I'll gladly go to the hardware store to get them, but I don't know what length and size. 3/8 or 5/16 and fine or course thread. Thanks 2020 RAM Longhorn 4x4 2022 Jeep Grand Cherokee Overland

Re: Are engine mount bolts really special??? [Re: 7812845] #1733584 01/19/15 01:37 AM 01/19/15 01:37 AM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	Quote: Poor wording on my part. I need the bolts that go thru the motor mounts to the k frame. I'll gladly go to the hardware store to get them, but I don't know what length and size. 3/8 or 5/16 and fine or course thread. Thanks The original ones for both B and E bodys from 1966 on are 7/16 diameter course thread with a tapered point and tapered starter threads on the end that goes into the motor mount. I have one OEM one in the shop I can measure tomorrow and let you know the length on it. I would like to find another stock one but there is no way I'm paying more than about $3.00 max for one Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Are engine mount bolts really special??? [Re: mikemee1331] #1733585 01/19/15 06:54 PM 01/19/15 06:54 PM
Joined: Jan 2003 Posts: 5,138 East Aurora (Buffalo) NY RoadRunner master
RoadRunner master Joined: Jan 2003 Posts: 5,138 East Aurora (Buffalo) NY	Quote: Quote: I need to locate some engine mounting bolts for my car so I thought I might just get some new ones while I'm at it. They are selling for $25 new. Am I missing something?? That sure seems like a bunch of money for them. What's so special to make them this expensive?? since i'm not a numbers guy it doesn't matter to me. I just go to the hardware store and buy hardened (grade 8) ones. then I discovered a local hardware store that has an unbelievable selection of stainless! so now when I take something apart, I replace with stainless hardware! Carefull on the stainless bolts. Most stainless bolts are not equivalent to grade 5. I had a chart somewehre that showed the strength of stainless versus the various grades. I was surprised. If its not a high load bolt, then you probably OK. But I would stick with grade 8s or minimally grade 5s for motor mounts. 68 Road Runner (383/4speed, post car w/decor pkg) - Major Project 69 Road Runner w/472 Hemi & 4 speed. 70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project 2023 Ford Mach 1

Re: Are engine mount bolts really special??? [Re: RoadRunner] #1733586 01/20/15 12:27 AM 01/20/15 12:27 AM
Joined: Jul 2005 Posts: 444 Loma Linda, MO 7 7812845 OP mopar
7812845 OP mopar 7 Joined: Jul 2005 Posts: 444 Loma Linda, MO	I appreciate the updated information on this. Sounds like I need to step up to grade 8 bolts just to be safe. 2020 RAM Longhorn 4x4 2022 Jeep Grand Cherokee Overland

Re: Are engine mount bolts really special??? [Re: 7812845] #1733587 01/20/15 11:37 AM 01/20/15 11:37 AM
Joined: Mar 2012 Posts: 959 france J jose jones super stock
jose jones super stock J Joined: Mar 2012 Posts: 959 france	Sometimes you get a motor mount bolt that decides it is not going to start threading, The last big block i installed I couldn't get the passenger side to start, So I ran to a buddy's house and got a factory style tapered bolt ( this was the passenger side, driver side worked with a hardware store bolt)which worked great after fighting the passenger side mount for a hour with a hardware store bolt

Re: Are engine mount bolts really special??? [Re: jose jones] #1733588 01/20/15 03:48 PM 01/20/15 03:48 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Yeah it's the tapered end and I somehow remember them looking galvanized. That plus the handling on each bolt must be many times that of the hardware store bolt. It's the same (costly bolts) for my brand f car. R.

Re: Are engine mount bolts really special??? [Re: RoadRunner] #1733589 01/20/15 04:40 PM 01/20/15 04:40 PM
Joined: Apr 2010 Posts: 4,154 bethlehem pa M mikemee1331 master
mikemee1331 master M Joined: Apr 2010 Posts: 4,154 bethlehem pa	Quote: Quote: Quote: I need to locate some engine mounting bolts for my car so I thought I might just get some new ones while I'm at it. They are selling for $25 new. Am I missing something?? That sure seems like a bunch of money for them. What's so special to make them this expensive?? since i'm not a numbers guy it doesn't matter to me. I just go to the hardware store and buy hardened (grade 8) ones. then I discovered a local hardware store that has an unbelievable selection of stainless! so now when I take something apart, I replace with stainless hardware! Carefull on the stainless bolts. Most stainless bolts are not equivalent to grade 5. I had a chart somewehre that showed the strength of stainless versus the various grades. I was surprised. If its not a high load bolt, then you probably OK. But I would stick with grade 8s or minimally grade 5s for motor mounts. WOW!! I didn't know that and of course had to research it. it seems they are equivalent to a grade 2 bolt! Luckily (I hope ) the mission has been limited to bolt on stuff like thermostat housing, carb nuts and that type of thing. i know i did my motor mount brackets in grade 8. well, mission aborted! thanks for the heads up!

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