70 PB Booster Elbow on Booster

[Bill L.]

Does anyone repro an elbow that will pas NCRS judging?


Thanks,



Bill

[Jack H.]

Re: 70 PB Booster Elbow on Booster

If by 'elbow' you mean the check valve, the only thing mentioned in the current edition of the JG book is that it's plastic and was painted black with the booster.

Earlier Corvette divisions call for an off-white plastic check valve that's NOT painted black and has two circular ribs on the face with the inner circle being higher than the outer circle.

This version of the part is virtually impossible to find as the only place I've seen correct/originals is on scrap yard cars of the era. Typically, these are VERY aged/discolored and you wind up on that old teeter totter of trading originality points for condition points making their acquisition dubious UNLESS you happen to stumble across one that's pristine...

I know of no similar criteria for check valve construction/geometry that applies to Shark era cars. I'd question the judge's call IF that's the reason you lost any points and see what the National Team Leader thinks...

[Dick W.]

Re: 70 PB Booster Elbow on Booster

Jack, it will be called if is is not TFP

[Terry M.]

Re: 70 PB Booster Elbow on Booster

I remember posting a picture to a similar thread a while back. As awkward as it is, "search" is your friend. I sometimes see links to similar topics when I click on a new subject. I don't know why they seem to come and go, but I do work off of three different computers -- all with different operating systems. Technology is SO confusing, so I have some sympathy.

[Jack H.]

Re: 70 PB Booster Elbow on Booster

Fair enough...Typical Factory Production (TFP) IS the standard we judge to! But, what I was saying is the JG books (68-69 & '70-72) simply say it's a plastic component that was painted black. Mid-year JG's give elaborate description(s) of the geometry/configuration of the part they deem correct/original.

These check valves are available from a number of suppliers and I'd bet Chevy used more than one qualified source for the part in 68 & later. So, what (beyond a specific judge's personal knowledge) qualifies one version over another as being TFP? That's the issue.

The original post was where to get one of the elusive critters and absent a better, more refined, textual description, any/all of what's available today seem to qualify.

[Bill L.]

Re: 70 PB Booster Elbow on Booster

I try to search before I post but sometimes it has to do with exactly what I type in to search.

I do have an excellent NOS but it does differ a little from the brittle original. It is definitely the plastic you speak of so I guess I will use it and make sure it is black too.


Thanks!



Bill

[Terry M.]

Re: 70 PB Booster Elbow on Booster

Well the search didn't work for me either. Let's see if I can post the picture to this thread, but I am not optimistic.

[Bill L.]

Re: 70 PB Booster Elbow on Booster

Thanks Terry,

Looks just like my original except mine has a "1" in the center versus the "2" on yours. Wonder what the number indicates.

Yours is in slightly better shape in that mine has a big chip out of it.

My hose is basically petrified. My hose has some yellow printing "KV 11/32 GK. SAE from what I can read.

I have never seen a correct one on ebay or anywhere else except an original car.

Kindest Regards,


Bill

[Terry M.]

Re: 70 PB Booster Elbow on Booster

I have no clue as to what the number means, but best guess would be a mold number. I'm sure whatever machine made them cranked them out by the hundreds of thousands. I doubt they are Corvette specific parts. After the better part of 40 years it is remarkable that plastic parts like this still work. I'm sure we are well beyond their design life.

You are, of course, on the horns of that dilemma whether to sacrifice originality for condition. It happens to all of us. The only advice I can offer is that the judging score sheets are, in general, biased toward originality. That is if one adds up the total points allocated to originality and those allocated to condition, originality will have the greater points assignment. A specific part might not follow this trend, but most do.

My power brake hose is fairly rigid as well, but is no issue given my use (or rather non-use) of the car. I'll spare us all the humor in that situation, and avoid the wrath of the administrators as well.

There are no markings that I can see on the vacuum hose going to my power brake booster, so I would opine that not all of them were marked. Of course it is possible I might have worn those marks off the hose while fondling it. Consider looking for an unmarked hose to widen your chances of success.