Topic: Body Mount Bolt Size
in Forum: C3 Body
Already a Member?
Click Here to Login
Not yet a Member?
Click Here to Register for Free!
Hey Everybody,
I'm getting things together to start replacing the body mount bushings on my 1977. I want to get new bolts before I start and I was wondering if anybody had any info on them? I haven't taken any out yet to see what size they are and have been searching the net with no luck. Anybody know what diameter, length, and thread the body mount bolts are?
Thanks!
1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
SPONSOR AD:: (Our Sponsors help support C3VR)
Lifetime Member
http://www.volvette.com/page/VVP/PROD/c-body-boyd-mount/BM15T
And they are one of our sponsors !
JimG 2007-12-17 19:39:10
And they are one of our sponsors !
Lifetime Member #73
The Money Pit.... and my niece 
(click to see a slightly larger version)
Thanks, but I'm not going to get them through a vendor. None of the vendors list the actual size of the bolts, probably because they don't want you getting other bolts like I plan to do!
1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
I'm looking to replace them with SS ARP bolts... that's why I'm not really interested in getting them from a vendor in a kit. I figure if I'm going to spend $20-$30 (or $40 in the case for the vendor in the link above) for 8 bolts from a vendor.... then I'm willing to spend more for SS! Thanks for looking them up in your parts catalog though!
1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
Dale,
Can you get one out and measure it?
Are you going to use a standard SS hex bolt and SS washer?
Save the Wave!
Support the National Corvette Museum
Support the National Corvette Museum
Looks like that's what I'll be doing. I was hoping somebody may have had some lying around that was waiting to do it or had recently changed them. Wanted to get all the parts before I actually dove into it! I'm going to start spraying them with PB blaster this week, then maybe this weekend I will attempt to take one out. I don't think mine should be that bad. Luckily my vette has been garaged most of its life.
I was planning to use ARP SS hex bolts (assuming they make the size I need) and grade 8 washers. ARP stainless bolts are classified as grade-8 and are actually rated as stronger. I just hear about how much these bolts rust up, so I figure if a vendor is going to charge around $5 for a bolt.. then I might as well get better bolts so I don't have to worry about the rust issue. So if I decide to take the body off in about 25 years or so I won't be that much of an issue.. haha.
1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
Just for future information.... finally took one of the bolts out.
Bolts are 7/16 - 14, 3.5" UHL.
Unfortunately, each of my #4 cage nuts just spin! I'm going to have to get in there and see if the reinforcements are ok. I ended up taking a bolt of the #2 mount, which came loose very easily without any PB blaster. Hoping I'm just as lucky with the remaining #1, #2, and #3 mounts and only have issues with each #4. Ordered some replacement SS bolts and nylon lock nuts. Depending on the condition of the #4 reinforcements I may just use a nut from the inside.
1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
Former Member
Send PM
Yelm, WA - USA
Joined: 7/12/2007
Posts: 356
Vette(s): 1979 L82 4 speed Scat 383 crank 190 cc Procomp Aluminum Heads 202 160 stainless valves GM Powder metal rods Speedpro H860CP Hypereutectic pistons 280 cam hydralic HEI Pro comp 1.6 roller rockers Mighty Demon 750 Sanderson CC1AP Hedders.
Good luck with the others! All of my bolts were in pretty bad shape and didn't want to come out wihtout a fight so I don't think you can go wrong drowning them in PB blaster before wrenching on them. I'm fairly sure I wrecked a cage nut trying to muscle one out. I kept the bad ones and they are pretty scary, on one about half of the bolt had dissolved, looked like something was gnawing on it
. Good Luck!
in Forum: C3 Body
SPONSOR AD: (Our Sponsors help support C3VR)