Author Topic: Block crayon marks  (Read 10169 times)

BillOhio

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Block crayon marks
« on: March 28, 2014, 12:53:35 AM »
Anyone want to take a guess what this was?
Drivers side front cylinder. Pan rail is at bottom
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible

Mark

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Re: Block crayon marks
« Reply #1 on: March 28, 2014, 01:44:36 PM »
CK?
Mark C.
1969 Indy Pace Car
350/300HP RPO Z11

BillOhio

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Re: Block crayon marks
« Reply #2 on: March 28, 2014, 05:25:35 PM »
I thought OK but weird its there
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible

firstgenaddict

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Re: Block crayon marks
« Reply #3 on: March 28, 2014, 09:03:43 PM »
I have seen DZ and 302 on the block sides in the past.
James
Collectin' Camaro's since "Only Rednecks drove them"
Current caretaker of 1971 LT1's - 11130 and 21783 Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://plus.google.com/photos/112392262205377424364/albums?banner=pwa

rszmjt

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Re: Block crayon marks
« Reply #4 on: March 29, 2014, 05:10:45 AM »
I have a 6,000 mile 70 Z28 engine and CTB can clearly be seen both sides of the block . I too have seen DZ on 302.

Mark

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Re: Block crayon marks
« Reply #5 on: March 29, 2014, 12:18:48 PM »
Well theres no CK engine suffix for a chevy engine, could be a CR which is a 1958 Corvette 283, or maybe it is an OK.
Mark C.
1969 Indy Pace Car
350/300HP RPO Z11

Mike S

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Re: Block crayon marks
« Reply #6 on: March 29, 2014, 12:22:33 PM »
 My vote is with 'OK'
It's good to see these marking were done while the engine was assembled and prior to painting over them and surviving today.

Mike
67 04B LOS SS/RS L35 Hardtop - Original w/UOIT
67 05B NOR SS/RS L35 Convertible - Restored

JohnZ

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Re: Block crayon marks
« Reply #7 on: March 29, 2014, 03:17:46 PM »
All engines had what would ultimately become the stamp pad suffix scrawled on the side of the block in grease pencil; that was done in the first operation on the engine assembly line, where the block was upside-down and the bores were air-gaged. That marking told everyone on the line what innards and external parts to install in the block (cam, crank, rods, pistons, oil pump and pickup, pan, balancer, lifters, heads, intake, water pump, valve covers, distributor, etc.). The pad didn't get stamped until the engine was turned right-side-up and the heads went on.
'69 Z/28
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Mike S

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Re: Block crayon marks
« Reply #8 on: March 29, 2014, 03:28:56 PM »
Hi John,

  I thought the engine prefix stamp was applied before the heads were mounted which explained why some of the stampings were close to the head to deck edge or under the water plug protrusion as with BB's. Or was it different between BB and SB in regards to when the pad was stamped in relation to the head mountings?

Mike
67 04B LOS SS/RS L35 Hardtop - Original w/UOIT
67 05B NOR SS/RS L35 Convertible - Restored

BillOhio

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Re: Block crayon marks
« Reply #9 on: March 29, 2014, 03:59:42 PM »
This was on head. Same cylinder
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible

firstgenaddict

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Re: Block crayon marks
« Reply #10 on: March 29, 2014, 06:51:54 PM »
Here is the engine out of the blue 69 Z I recently restored.



Hi John,

  I thought the engine prefix stamp was applied before the heads were mounted which explained why some of the stampings were close to the head to deck edge or under the water plug protrusion as with BB's. Or was it different between BB and SB in regards to when the pad was stamped in relation to the head mountings?

Mike

Yes, BB were stamped without heads installed, SB with the heads installed
James
Collectin' Camaro's since "Only Rednecks drove them"
Current caretaker of 1971 LT1's - 11130 and 21783 Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://plus.google.com/photos/112392262205377424364/albums?banner=pwa

ZLP955

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Re: Block crayon marks
« Reply #11 on: March 29, 2014, 10:07:11 PM »
Interesting! I was cleaning up a Flint CE block recently and noticed yellow grease pencil marks on one side (which I have left undisturbed); Would the same process as JohnZ described have applied equally to a CE assembly as a production engine?
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA.
AHRA Formula Stock at Lions Dragstrip, NHRA E/MP at Pomona Raceway

BillOhio

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Re: Block crayon marks
« Reply #12 on: March 29, 2014, 11:49:01 PM »
Mine looked to be yellow but I do wonder if they were white that aged?
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible

JohnZ

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Re: Block crayon marks
« Reply #13 on: March 31, 2014, 04:22:01 PM »
Hi John,

  I thought the engine prefix stamp was applied before the heads were mounted which explained why some of the stampings were close to the head to deck edge or under the water plug protrusion as with BB's. Or was it different between BB and SB in regards to when the pad was stamped in relation to the head mountings?

Mike

On small-blocks, the machine code stamp was done after the heads went on; on big-blocks, the machine code stamp was done BEFORE the heads went on so the stamp could be done on the outboard end of the pad without having the big threaded plug in the head in the way of the gang-holder. Big-blocks had to be done that way so the car assembly plants could stamp the VIN derivative on the INBOARD end of the pad, where there was no plug in the way of the stamp.
'69 Z/28
Fathom Green
CRG

JohnZ

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Re: Block crayon marks
« Reply #14 on: March 31, 2014, 04:28:57 PM »
Interesting! I was cleaning up a Flint CE block recently and noticed yellow grease pencil marks on one side (which I have left undisturbed); Would the same process as JohnZ described have applied equally to a CE assembly as a production engine?

Yes - the only difference was that a "CE" engine was a short-block, so it didn't get heads, an intake, a water pump, distributor, or an oil pan. This made them difficult to handle (had to be done manually with hi-lo's and wooden pallets when they got to the end of the line), so they were usually run on weekends.
'69 Z/28
Fathom Green
CRG

ZLP955

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Re: Block crayon marks
« Reply #15 on: March 31, 2014, 08:36:41 PM »
Great, thanks again as always John! Now I'll have to try and decipher the crayon markings.
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA.
AHRA Formula Stock at Lions Dragstrip, NHRA E/MP at Pomona Raceway

Stingr69

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Re: Block crayon marks
« Reply #16 on: April 01, 2014, 04:52:31 PM »
Havent seen a lot of these but the ones I did see were horizontal - if that is "OK" written there then it looks like it is on the vertical plane.  (If that maked sense).  It does not look like a typical engine suffix location/orientation is what I would say. 

-Mark.

BillOhio

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Re: Block crayon marks
« Reply #17 on: April 02, 2014, 12:44:29 AM »
It is vertical. O is by the pan. Or what ever it is
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible

dnroe

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Re: Block crayon marks
« Reply #18 on: April 21, 2014, 12:52:59 PM »
New member and first post for me.   I was cleaning up the engine I am going to use in my Camaro yesterday and noticed the same yellow colored markings.   The engine is not original to the car and is a 69 HK code motor 300 horse L48 from an impala.   Has HK very clearly on the passenger side head and upside down on the side of the side of the block.   Also appears to have PS on the other side of block.   Anyone have any idea if that could denote power steering?   Engine has more crayon behind the motor mounts I will try to get uncovered and try to decipher as well.   I can try to get any pics if anyone is interested.

rszmjt

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Re: Block crayon marks
« Reply #19 on: April 22, 2014, 10:08:58 PM »
1970 6,000 mile LT1

ZLP955

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Re: Block crayon marks
« Reply #20 on: April 22, 2014, 10:29:37 PM »
Great photo Mike, and nicely preserved. Must be a nice car, reminds me of the very low mileage one that Charley found a while back.
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA.
AHRA Formula Stock at Lions Dragstrip, NHRA E/MP at Pomona Raceway

rszmjt

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Re: Block crayon marks
« Reply #21 on: April 22, 2014, 10:34:47 PM »
No car, it was out of a rolled 6,000 mile 70 Z28 that was wrecked around 70-71.

ZLP955

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Re: Block crayon marks
« Reply #22 on: April 22, 2014, 10:42:58 PM »
Ah, pity the car was lost, but explains such a low-mileage engine!
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA.
AHRA Formula Stock at Lions Dragstrip, NHRA E/MP at Pomona Raceway

BillOhio

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Re: Block crayon marks
« Reply #23 on: April 29, 2014, 04:27:06 PM »
Seen this in how to hotrod your small block chevy
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible