Author Topic: L30/M20 mystery 12 bolt  (Read 2774 times)

Quick L30

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L30/M20 mystery 12 bolt
« on: March 16, 2019, 02:21:58 AM »
Hello all, I wanted to finally share some info on my L30/M20 on this site. I have posted about my NCRS letter here, but have only posted most of this previously on team Camaro. I figured after almost a year I have done enough due diligence on the car to share with experts here.

This is a 2 owner California car, it has spent most of its life in ca, original owner had it until 1970, then the 2nd owner took it Colorado in 2014. The 2nd owner finally moved to Texas, where I bought in May 2018. The 2nd owner was not very forthcoming with many details, and was not able to provide any documentation.

The car has a very solid body, complete interior and trim, and as far as I can tell has been fairly well cared for since 1970 by the 2nd owner. He relayed to me the history I typed above, and that's about it. This car has completely solid floors, trunk and rear frame rails. It does have a 12 bolt, which I can't find any numbers stamped on. It looks like a Macco quality repaint happened at some point and it's clearly in need of a paint job and some minor rust bubble repair on the lower fender.
The car has its original K19 optioned L30, albeit with a decked barely legible pad. Original heads, manifolds, and correct q-jet are also present.





Pad Stamp: Block has been decked, but after lots of staring at the numbers, looks like: T110?ML to me. ( Tonowanda, Nov, 0?, L30 M20 With AIR)


Block Cast Date: J276, should line up with engine assembly first week november and body assembly 2nd week november


3890462 Heads:







So far one of the mysteries of my car is the 12 bolt I have in it. I was told by the 2nd owner that it was a service replacement in the early 70's. I have wire brushed the right axle tube in various locations and cannot find a stamp. The rear has no provision for a radius rod and I can't decipher a date code in the webbing area. Would a service replacement 12 bolt have included a radius rod when installed later than early '67? The single leaf brackets appear correctly installed, so I don't believe this was a hack up job.





Bonus mystery in the quarter panel trunk dropping area I started looking around. I bought a wireless BT endoscope and started poking around the inner sheetmetal. Aside from solid rockers and floors, I believe this car has very solid original quarters and wheelhouses. I did identify an interesting label while scoping the area at the edge of the trunk pan where it meets the quarter and there is a small gap. I ran scope down and forward and found the following label: "9-28-66 GARY SHEET AND TIN UNITED STATES STEEL" "GALVANIZED" and a code: "R428127". Anyone seen this before?




« Last Edit: March 16, 2019, 02:42:01 AM by Quick L30 »
1967 RS L30 - M20
11B
R-R
Original 327 & K19 intact

67CruiseMaster

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Re: L30/M20 mystery 12 bolt
« Reply #1 on: March 16, 2019, 04:47:50 PM »
Rolled steel that was provided by United states steel (USS) from Gary, Indiana back in 1966 from which chevrolet body parts were made out of.

Scot
67 SS/RS with original Cruise Control
67 Tuxedo Black Convertible.

Petes L48

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Re: L30/M20 mystery 12 bolt
« Reply #2 on: March 16, 2019, 09:13:34 PM »
Gordon, does your K19 air cleaner base look like this one?  I originally bought it to use on an L48, then was lucky enough to find the correct L48 version which has one of the tubes oriented different.  I never did determine what this one was from.

Mine is a K250 Fisher schedule, a couple days before your car.  And it was similarly a Cali car that eventually made its way east, to Georgia in the mid 80s in my case.   


Quick L30

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Re: L30/M20 mystery 12 bolt
« Reply #3 on: March 16, 2019, 10:05:48 PM »
Pete,

Here's mine:

1967 RS L30 - M20
11B
R-R
Original 327 & K19 intact

Petes L48

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Re: L30/M20 mystery 12 bolt
« Reply #4 on: March 17, 2019, 01:24:38 AM »
That seems to be how the L48 one is oriented.  Does it still have the black and gold AC label on the outside with the part number?  Also just noticed you have chrome valve covers with breathers in each.

Quick L30

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Re: L30/M20 mystery 12 bolt
« Reply #5 on: March 17, 2019, 02:52:43 AM »
1967 RS L30 - M20
11B
R-R
Original 327 & K19 intact

Petes L48

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Re: L30/M20 mystery 12 bolt
« Reply #6 on: March 17, 2019, 03:23:04 AM »
I'm thinking the only difference between the L30 and L48 would have been the chrome lid, and the bases are identical.  Yours should be 6421914, and it looks like someone just stuck the wrong repop label on it.  Funny how the AIM page shows the bottom tubes incorrectly oriented, and like the mystery base I have.  Thanks.