Request to J. Lucia.

[Harry S.]

Joe, what can you say about a MC with casting number 5431773? It was on on 63 pilot cars 16, 17 and 18.

Thanks

[Joe L.]

Re: Request to J. Lucia.

Joe, what can you say about a MC with casting number 5431773? It was on on 63 pilot cars 16, 17 and 18.

Thanks

Harry-----


Unfortunately, I can't find anything on that number. As a matter of fact, I cannot find that any part numbers, including casting numbers, in the series 543xxxx were ever released.

[Michael H.]

Re: Request to J. Lucia.

Joe, what can you say about a MC with casting number 5431773? It was on on 63 pilot cars 16, 17 and 18.

Thanks

Harry,

Are you absolutely sure the casting number is 5431773 and not 5461773?

A casting number in the 5461773 range would be closer to being applicable to Delco parts cast in the early 60's.

[Harry S.]

Re: Request to J. Lucia.

Harry,

Are you absolutely sure the casting number is 5431773 and not 5461773?

A casting number in the 5461773 range would be closer to being applicable to Delco parts cast in the early 60's.

Just checked the picture on my phone, 431773 is there with a date of 8-61. A prior owner of the car says it was 5431773.

[Rick A.]

Re: Request to J. Lucia.

Cranky,

I exchanged email with Jerry Bramlett who at one time owned all three pilot line cars mentioned and he said the M/C was definitely 5431773. He still owns #18

[Michael H.]

Re: Request to J. Lucia.

Cranky,

I exchanged email with Jerry Bramlett who at one time owned all three pilot line cars mentioned and he said the M/C was definitely 5431773. He still owns #18

Thanks Rick....

I looked in an old GM book that converts casting numbers to part numbers (and also part numbers to casting numbers) but the 5431773 isn't shown.

I still wonder if that cyl was originally used on some other GM vehicle around 1961-62, then also used on the 63 Corvette pilot cars. Mike McKown thinks it was Nova with metallic brakes??

[Joe L.]

Re: Request to J. Lucia.

Just checked the picture on my phone, 431773 is there with a date of 8-61. A prior owner of the car says it was 5431773.

Harry-----


I believe that GM #5431773 would be a part number assigned to the Delco-Moraine Division of GM. In any event, it is not a car division part number. However, as I mentioned, I cannot find that any part numbers in the 543xxxx series were ever released. If the number is actually 5431771 then, apparently, at least one number in the 543xxxx series was released. I can find no record of it, though.

There is one other possibility, though. If this master cylinder is not a Delco-Moraine master cylinder, it could be that the 5431771 is a non-GM casting number which just, coincidentally, appears "close" to a GM number series. However, if the master cylinder has cast upon it "GM", "Delco-Moraine", or the Delco-Moraine symbol, then it is a GM master cylinder and the number is a GM part number.

[Rick A.]

Re: Request to J. Lucia.

ALL,

Exchanged email with Jerry Bramlett again after Joe's post, and here is what Jerry had to say

Rick, the number on the master cylinder of #18 is not 431773 or 5431773. It is 5481773. It does have a Delco symbol cast into the underside, and it also says 7/8" and R5. It's probably just a master cylinder that was available during the Pilot Line build but was designed for another GM vehicle.

[Joe L.]

Re: Request to J. Lucia.

ALL,

Exchanged email with Jerry Bramlett again after Joe's post, and here is what Jerry had to say

Rick, the number on the master cylinder of #18 is not 431773 or 5431773. It is 5481773. It does have a Delco symbol cast into the underside, and it also says 7/8" and R5. It's probably just a master cylinder that was available during the Pilot Line build but was designed for another GM vehicle.

Rick------


I think he's still got it wrong. Quite some time ago I did a little research on the 548xxxx series of numbers and could not find that any in this series were ever released. I strongly suspect the number is either 5451773 or 5461773 and, most likely, the latter. I don't have any information on it, though.

[Rick A.]

Re: Request to J. Lucia.

Joe,

The pix that Jerry sent me sure looks like 5481773 to me

[Harry S.]

Re: Request to J. Lucia.

I'll enlarge the picture and see if the 3 is an 8. I'll let ya know.....

[Joe L.]

Re: Request to J. Lucia.

Joe,

The pix that Jerry sent me sure looks like 5481773 to me

Rick-----


Casting numbers can often be hard to discern. As I mentioned, quite some time ago I did some research on the 548xxxx series of part numbers. This was done because some folks think the 1968-76 power brake master cylinder has a casting number of 5480346. However, I could not find that ANY parts of part number series 548xxxx were ever released. I expect that series was assigned to Delco-Moraine but never used. The 68-76 power brake master cylinder is GM #5460346. The third digit character may APPEAR like an "8", but it's not.

Also, assuming that series 548xxxx was ever used (and I'm virtually certain it was not), I'd be flabbergasted to learn it was used as early as 1962 or 1963.