1969 Engine Mounts - need some help / advice

[Kevin S.]

Re: 1969 Engine Mounts - need some help / advice

Thank you for the clarification, Joe.

General consensus here seems to be that the locking-style engine mounts are the best way to go.

And, it looks like the Corvette Central locking-style engine mounts made by Anchor-Korea are good quality and fit.

I am back on the right path again. Thanks everyone for your thoughts and advice.

Kevin

[Patrick H.]

Re: 1969 Engine Mounts - need some help / advice

Thank you for the clarification, Joe.

General consensus here seems to be that the locking-style engine mounts are the best way to go.

And, it looks like the Corvette Central locking-style engine mounts made by Anchor-Korea are good quality and fit.

I am back on the right path again. Thanks everyone for your thoughts and advice.

Kevin

Just to confirm, the 302004 or 302005 (CC part numbers)?

[Owen L.]

Re: 1969 Engine Mounts - need some help / advice

Owen,

FYI, these generic aftermarket mounts usually fit poorly with regard to the spacing and thickness of the “big ears” that hold the through-bolt to the engine.

The Corvette Central ones are the first one I have found - at least of the locking style - that fit like older Anchors or original GM.

Patrick,
I completely agree about CC's locking reproductions being a great fit. I went through 2 Anchor sets trying to get a good fit on my '72 (they were way too sloppy on the frame horn) before getting the CC mounts. They fit like a glove.

My hesitancy with the non-locking from CC is that I believe they are Anchor mounts that I can get locally and nothing specific to reproducing the GM mount of the '60s. My original mount looks different than the replacement Anchor I also pulled off my '67. Both are non-locking, but the Anchor rubber is thicker and less clean looking than the GM. (Maybe that's just indicative of Anchor in the mid-'70s.) The DEA Marmon mount looks much like the GM. I'll follow-up after I get it and check the fit. If it's no good, I'll order the CC mount.

And, it looks like the Corvette Central locking-style engine mounts made by Anchor-Korea are good quality and fit.

Kevin

Kevin, I don't believe the CC locking mounts are Anchor-Korea mounts - at least the pair I got a few years ago aren't marked as such. Their locking mounts are a great fit compared to the over-the-counter Anchor mounts I also tried.

[Kevin S.]

Re: 1969 Engine Mounts - need some help / advice

Hi Patrick,

I ordered a set of CC PN 302055 1970-1982 Engine Mounts Locking (correct) today. These are compatible with GM PN 3967767 so I am confident they will fit my 1969. Thank you once again for your help and advice.

Kevin

[Kevin S.]

Re: 1969 Engine Mounts - need some help / advice

Hi Mark,
This was part of my initial confusion and why I initially decided to post a thread here on the Tech Discussion Board, whether to go with locking-style engine mounts and take the point(s) hit for judging or go with the original non-locking style engine mounts that would be similar to GM PN 3967767...because I had read that Corvette was not included in the recall.

However, with a little guidance and advice help from my NCRS friends, I am going with new Corvette Central locking-style engine mounts PN 302005. I will post some follow-up pics here and also on Corvette Forum for those interested in the emboss or stamp information, if there is anything at all, stamped on the new CC locking engine mounts. Should have them in 1-2 weeks.

[Jeffrey A.]

Re: 1969 Engine Mounts - need some help / advice

I can help with pics. I used the CC locking style engine mount on my 72 last year; it was a great fit, no problem.

I don't see any numbers on them.
IMG_2401.jpg

[Kevin S.]

Re: 1969 Engine Mounts - need some help / advice

Hello Group,
The Corvette Central locking-style engine mounts (PN 302005) arrived and just as Jeffrey says there are no stamps, numbers, emboss, or country of origin information on them anywhere. They may be made in Korea but it does not show that anywhere, which I am happy about. On another note, these are incredibly well made, built like a tank with extra welded reinforcements in what I am calling the boss area where the long though-bolt passes through the engine mount and the frame support. And, they test fitted onto the frame support perfect, no slop at all. And, they test fitted onto the engine block perfectly too.

It does require me to change the long through-bolt with these new CC engine mounts. Not sure if what was on the car is correct or not with the old Made In Korea engine mount but the old long through-bolt was a grade 5 size 7/16" - 20 x 3 7/8" hex head and had Marsden self-locking nuts on them, which my TIM&JG book shows applicable for the 427 motor. I was doing more research on Chevy web sites about 350 small blocks the long through-bolt and the general consensus was that I should be using a grade 8 bolt, rather than grade 5, so I am heading down that path. Looks like I'll need a hex head grade 8 size 7/16" - 20 x 4 1/2" long bolt with Stover locking nuts and grade 8 flat washers which I can source from the Bolt Depot.

None of these engine mount upgrades put me in the NCRS correct area for CDCIF points but it will be a really nice safety improvement for this car.

Kevin

[Chris H.]

Re: 1969 Engine Mounts - need some help / advice

Kevin look great. One tip for install is have all the nuts / bolts hand started before you tighten anything. I learned this the hard way.

[Joe L.]

Re: 1969 Engine Mounts - need some help / advice

Hello Group,
The Corvette Central locking-style engine mounts (PN 302005) arrived and just as Jeffrey says there are no stamps, numbers, emboss, or country of origin information on them anywhere. They may be made in Korea but it does not show that anywhere, which I am happy about. On another note, these are incredibly well made, built like a tank with extra welded reinforcements in what I am calling the boss area where the long though-bolt passes through the engine mount and the frame support. And, they test fitted onto the frame support perfect, no slop at all. And, they test fitted onto the engine block perfectly too.

It does require me to change the long through-bolt with these new CC engine mounts. Not sure if what was on the car is correct or not with the old Made In Korea engine mount but the old long through-bolt was a grade 5 size 7/16" - 20 x 3 7/8" hex head and had Marsden self-locking nuts on them, which my TIM&JG book shows applicable for the 427 motor. I was doing more research on Chevy web sites about 350 small blocks the long through-bolt and the general consensus was that I should be using a grade 8 bolt, rather than grade 5, so I am heading down that path. Looks like I'll need a hex head grade 8 size 7/16" - 20 x 4 1/2" long bolt with Stover locking nuts and grade 8 flat washers which I can source from the Bolt Depot.

None of these engine mount upgrades put me in the NCRS correct area for CDCIF points but it will be a really nice safety improvement for this car.

Kevin

Kevin------


For comparison, attached are photos of an NOS GM #3980701 locking type motor mount [not for sale]. This was the locking style mount first used for 1970. Corvette PRODUCTION and once available in SERVICE:


DSCN1320.jpgDSCN1321.jpgDSCN1322.jpgDSCN1323.jpg

[Jeffrey A.]

Re: 1969 Engine Mounts - need some help / advice

Thanks for all the photos. You can see the difference to a NOS mounting, but the reproduction is not bad and safe.

What I noticed a most about it was the number on the side, locking mount weld, and some small diffrence in the shape.

Great to know! Thanks at all.

[Kevin S.]

Re: 1969 Engine Mounts - need some help / advice

Hey Joe,
Thank you for the additional photos of the NOS 3980701 locking-style engine mount. Interesting to see the orignal 1970 safety design.

I can be a little critical of Corvette Central parts since the company was sold a few years back but they got these 1970 - 1982 locking engine mounts right. They are solid as a rock and they fit like a glove on my 1969 engine supports. They do require a longer through-bolt due to the extra thickness of the "ears" I think was the term Patrick used.

One random question. I was planning to use blue threadlocker on the 4 1/2" long through-bolt threads with the new Stover self-locking nuts. I assume the Stover self-locking nuts alone are good enough based on their design and function but I have been putting blue threadlocker on everything that vibrates for piece of mind and future corrosion resistance of all chassis and mechanical threads. Planned to do the same with the Stover self-locking nuts too.

[Chris H.]

Re: 1969 Engine Mounts - need some help / advice

Kevin for my mount through bolts I went with a flat washer, lock washer and anti-sieze and tightened the hell out of them. I do remember having to custom order the bolts as my originals were too short for the CC mounts. Grade 8.

[Joe L.]

Re: 1969 Engine Mounts - need some help / advice

Kevin for my mount through bolts I went with a flat washer, lock washer and anti-sieze and tightened the hell out of them. I do remember having to custom order the bolts as my originals were too short for the CC mounts. Grade 8.

Chris------


The original GM bolts for the locking style mount were GM #399803. These bolts were 7/16-14 X 4-7/16" and were black phosphate finished. They were SAE grade 8 and had a piloting tip. Nuts used with these bolts were GM #9422299 and were distorted thread type lock nuts and zinc plated.

By the way, the earlier non-locking mounts used bolt GM #3817224. This bolt was 7/16-20 X 3-7/8", zinc or cadmium plated, and with a piloting tip. The nut used was GM #272876 which was a Marsden-type lock nut and zinc plated.

[Kevin S.]

Re: 1969 Engine Mounts - need some help / advice

Thank you for those additional bolt and locking-nut size and finish details, Joe. It helps.

[Patrick H.]

Re: 1969 Engine Mounts - need some help / advice

Did you consider buying the reproduction later style bolt kit?