Reading 1970 Chevelle Build Sheets
Blocks 42 through 80

Blocks 1 through 41 -- Blocks 42 through 80 -- Blocks 81 through 123

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Block No. Label & Information
42 FUEL GAUGE ~ Multiple variations among plants and even dates.
43 TRIM ~ 3-digit number indicating seat color, type, and material.
44 COLOR ~ Divided into 4 sections.
LW - 2-digit code for lower paint color.
UP - 2-digit or 1 letter code for upper paint color or convertible/vinyl top color.
ST - 1 letter code for D88 stripe color if factory ordered, else a hyphen (-) is printed.
W - two hyphens (--) or paint code number for wheel color,  XX found for RPO ZJ7 special wheel.
Typical examples might read:
* 25 A - 19 ~ '25' is lower body color of Astro Blue, 'A' is white vinyl top, '-' means no sport stripes, '19' black painted wheels.
* 28 28 W -- ~ First '28' is lower body color of Fathom Blue, second '28' is upper body color of Fathom Blue, 'W' indicates white sport stripes, -- indicates standard SS wheels.
* 48 48 - XX ~ First '48' is lower body of Forest Green, second '48' is upper body color of Forest Green, '-' means no sport stripes, 'XX' indicates special wheel group (RPO ZJ7 in this particular case).
(Note: If ZP3 special paint was ordered, LW, ST, & W codes could be a hyphen character; UP could be hyphen character or vinyl/convertible top color as appropriate)
Atlanta & Van Nuys have two variations concerning wheel color/type code.
Arlington has variation on '-' and '--' indicators.
45 WHEELS ~ Generally a 2-letter code for wheel type.  SS wheel codes on several plants are time dependent.
Arlington ~ variation #1
Atlanta, Baltimore, Van Nuys ~ variation #2
Kansas City ~ variation #3
46 RADIATOR ~ 2 or 4 character code depending on plant; code depending on application.
Arlington, Baltimore ~ variation #1
Atlanta, Kansas City ~ variation #2
Van Nuys ~ variation #3
47 RADIATOR UPR HOSE ~ 2-letter code depending on engine size. Codes changed during model year on some engines. Some plants differed on same engine with or without AC, some plants used same code for both. Numerous variations.
48 RADIATOR LWR HOSE ~ 2-letter code depending on engine size.
49 BATT ~ 3 or 4 alphanumeric code for battery type
50 BATTERY POS CABLE ~ 2-letter code depending on battery type.
51 BATTERY NEG CABLE ~ 2-letter code depending on battery type. Several variations depending on plant, engine size & date.
52 A/C COMPRESSOR ~ 3-digit number w/AC, --- w/o AC except Arlington
53 FRT END HARNESS ~ 2-letter code, varies
54 ENGINE HARNESS ~ 2-letter code, varies
55 AIR CLEANER ~ 2-letter code, varies with engine and dependent on ZL2
56 HYDRO PIERCE ~ 2-letter code, varies
57 ANTENNA ~ Format and code (if any) varies depending on plant and each plant has several variations.
58 HTR HOSE INLET ~ Format and code varies depending on plant, engine, and A/C equipped or not.
59 HTR HOSE OUTLET ~ Code varies depending on plant, engine, and A/C equipped or not.
60 SPEC. ORD. ~ only one entry found to date on Arlington sheet - basic L34 w/M21 & AC
61 BODY FRT HARNESS ~ One plant has no entries, others 4-digit code depending on series
62 BODY LAMP HARNESS ~ One plant has no entries, others 4-digit code depending on series
63 BODY POWER HARNESS ~ May contain a number, -- symbols or **** symbols; plant dependent
64 {BLANK} ~ varies from plant to plant, either asterisks (****), hyphens (--), 3-digit number or letter/digit
65 I.P. HARNESS ~
66 CONSOLE HARNESS ~
67 INST CLUSTER ~
68 MSTR CYL ~
69 STRG WHL ~
70 STRG COLUMN ~
71 STRG COL COLOR ~
72 TACH ~
73 SPEEDO CABLE ~
74 {BLANK} ~
75 CTRL ARMS FRT ~
76 CTRL ARMS REAR ~
77 CARPET FRONT ~
78 CARPET REAR ~
79 H/LINER ~
80 W/HOSE ~

Blocks 1 through 41 -- Blocks 42 through 80 -- Blocks 81 through 123

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