Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

[Paul C.]

I am going to have the 71 engine rebuilt--should I replace the motor mounts and bolts? Who sells an american made motor mount that looks like to original??the bolts, etc??

According to the 1970-72 AIM, the driver side motor mount bracket bolt goes from rear to front with the rear and front washer go outside the bracket. Doesn't show the passenger side but I read it goes rear to front too?? Any other mounting type hardwaree that shold be replaced whle the motor is out?

[Joe R.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

Paul,

Yes, I would replace the motor mounts but don't think it is necessary to replace the bolts unless damaged. I would also replace the mount at the rear of the transmission just to be on the safe side. It's an excellent opportunity to replace old rubber based parts.

Volunteer Vettes in Knoxville, TN. is an excellent place to purchase motor mounts. 1 615 521-9100

JR

[Patrick H.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

I am going to have the 71 engine rebuilt--should I replace the motor mounts and bolts? Who sells an american made motor mount that looks like to original??the bolts, etc??

Here:

http://www.parts123.com/corvettecentral/dyndetail.pta?catalog=0000050g&ukey=29608

I had to replace motor mounts recently on a small block 72. A friend who works on them even more than me told me to find NOS ones, as anything currently or recently available would not fit without a lot of effort. As I already had these on order I used them.

They fit like a glove and required zero rework. I let my friend know, and he's going to try them when he next needs motor mounts.

I don't know what Volunteer Vettes sells, but I wouldn't buy any others.

I did not have much of a chance to compare them to the NOS mounts I have in my personal parts collection, but in the end that wasn't necessary.

[Joe L.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

Here:

http://www.parts123.com/corvettecentral/dyndetail.pta?catalog=0000050g&ukey=29608

I had to replace motor mounts recently on a small block 72. A friend who works on them even more than me told me to find NOS ones, as anything currently or recently available would not fit without a lot of effort. As I already had these on order I used them.

They fit like a glove and required zero rework. I let my friend know, and he's going to try them when he next needs motor mounts.

I don't know what Volunteer Vettes sells, but I wouldn't buy any others.

I did not have much of a chance to compare them to the NOS mounts I have in my personal parts collection, but in the end that wasn't necessary.

Patrick-------


Do you know the country of origin of these mounts?

[Patrick H.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

Patrick-------


Do you know the country of origin of these mounts?

Nope. I'd suspect that they're made overseas, but unfortunately they all are at this point in time including any Anchor brand mounts. The current Anchors don't fit, and neither do the off-brands.

Corvette Central "might" tell you if you called.

[Joe L.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

Nope. I'd suspect that they're made overseas, but unfortunately they all are at this point in time including any Anchor brand mounts. The current Anchors don't fit, and neither do the off-brands.

Corvette Central "might" tell you if you called.

Patrick------


That's why I asked; I don't know of any US or Canadian manufactured engine mounts for 1982 and older Corvettes. I thought that the country of origin might be on the mount. The very low cost of the aftermarket, run-of-the-mill foreign mounts (e.g Anchor) has always worried me. I just don't see how a quality piece could be manufactured and sold for the kind of prices these things sell for. An off-shore manufactured mount would be OK with me if it was a quality piece. Of course, I'll never need to buy one unless I live to be about 500 years old. I have enough NOS mounts to last me until then [none for sale].

By the way, I measured the dimensions of an NOS mount to compare to those dimensions shown in the website. The functional dimensions (i.e those affecting fitment) are virtually the same. The material thickness dimensions of the NOS mount are slightly thicker than the reproduction. However, they are MUCH closer to NOS than any aftermarket mount I have seen. The weight of an NOS mount is 2.03 pounds.

The big issue, though, is whether the bonding of the rubber components is as good as the original mounts. I don't know of any practical means of determining that.

[Paul C.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

That is always the problem---finding a USA made quality parts. I will also replace the transmission mount--anyone know the original part # for a 1971. Anyone have some NOS motor mounts and trans mounts they want to sell? When it breaks the part was $10.95 but it cost you $250 or 5 hours of your time to remove and install the new part.

[Patrick H.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

That is always the problem---finding a USA made quality parts.

And also remember, just because it is a foreign-sourced part does not mean it is of inferior quality.

[Mark E.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

And also remember, just because it is a foreign-sourced part does not mean it is of inferior quality.

I had the same thought. Although it's a good feeling to know your car has original or NOS parts.

Does anyone remember the sweeping motor mount recall in the late 1960s? It affected many Chevrolet V8 models (although I don't know if Corvette was included). These cars had non-interlocking mounts which completely failed if the rubber or its bonding failed. Typically the LH mount failed during a hard left turn and/or hard acceleration. The combined force of the turn and engine torque would tear the mount, causing the engine to lift up on the left side. This in turn would pull the linkage to open the throttle, and sever the PB booster line. Imagine accelerating through a left turn, when suddenly the engine revs and power brakes are lost.

Quality engine mounts?

[Joe L.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

And also remember, just because it is a foreign-sourced part does not mean it is of inferior quality.

Patrick-------


I agree. In fact, many OEM components used in modern-day cars are foreign sourced, including many from China. There are many Tier 1 suppliers to the automotive industry in China. If one doesn't like Chinese-sourced components, don't even think about buying a new Corvette.

[Joe L.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

I had the same thought. Although it's a good feeling to know your car has original or NOS parts.

Does anyone remember the sweeping motor mount recall in the late 1960s? It affected many Chevrolet V8 models (although I don't know if Corvette was included). These cars had non-interlocking mounts which completely failed if the rubber or its bonding failed. Typically the LH mount failed during a hard left turn and/or hard acceleration. The combined force of the turn and engine torque would tear the mount, causing the engine to lift up on the left side. This in turn would pull the linkage to open the throttle, and sever the PB booster line. Imagine accelerating through a left turn, when suddenly the engine revs and power brakes are lost.

Quality engine mounts?

Mark------


At the time it was the largest recall in GM history. I can tell you that my original owner, late-build 1969 was originally equipped with non-locking style mounts and I never received a recall notice. I finally replaced the original mounts several years later when one of the original mounts broke. I replaced with the locking style which was the only style available from GM in SERVICE from about 1970 on. I recommend ONLY the locking style mount for any 1963+ Corvette.

[Leif A.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

I had the same thought. Although it's a good feeling to know your car has original or NOS parts.

Does anyone remember the sweeping motor mount recall in the late 1960s? It affected many Chevrolet V8 models (although I don't know if Corvette was included). These cars had non-interlocking mounts which completely failed if the rubber or its bonding failed. Typically the LH mount failed during a hard left turn and/or hard acceleration. The combined force of the turn and engine torque would tear the mount, causing the engine to lift up on the left side. This in turn would pull the linkage to open the throttle, and sever the PB booster line. Imagine accelerating through a left turn, when suddenly the engine revs and power brakes are lost.

Quality engine mounts?

I can remember the "fix" was to chain the left side of the engine to the frame...bubba style.

[Joe R.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

Patrick-------


I agree. In fact, many OEM components used in modern-day cars are foreign sourced, including many from China. There are many Tier 1 suppliers to the automotive industry in China. If one doesn't like Chinese-sourced components, don't even think about buying a new Corvette.

Go Joe, Tell it like it is!!!!!

Totally agree!

JR

[Jack J.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

I was under the impression Anchor mounts were US made? Please inform me if otherwise. Jack J.

[Patrick H.]

Re: Should I replace 1971 Motor Mounts & Bolts---Engine Rebuild

I was under the impression Anchor mounts were US made? Please inform me if otherwise. Jack J.

Even if they are, they're junk.