LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 1975 >> Hi-Cube Standard Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Quick-Check Tune-Up Specifications >> Specifications
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Quick-Check Tune-Up Specifications: Specifications

ENGINE IGNITION TIMING DISTRIBUTOR SPARK PLUGS CARBURETOR No
Man. Trans. Auto. Trans. Cam Angle Point Gap Type Gap Make&Type
CHEVROLET                 
250" 6 Cyl. 10°B 10°B (1) (1) AC R46TX .060" Roch. 1MV 1
292" 6 Cyl. 8°B 8°B (1) (1) AC R44TX .060" Roch. 1MV 2
350" V8 2-Bbl.   6°B (1) (1) AC R44TX .060" Roch. 2GC 3
350" V8 4-Bbl.                
  Light Duty (4) 6°B 6°B (1) (1) AC R44TX .060" Roch. M4MC 4
  Heavy Duty(5)                
    Federal 8°B 8° (1) (1) AC R44TX .060" Roch. 4MV 5
    Calif. 2°B 2°B (1) (1) AC R44TX .060" Roch. 4MV 6
400" V8                
  Federal 4°B 4°B (1) (1) AC R44TX .060" Roch. 4MV 7
  Calif. 2°B 2°B (1) (1) AC R44TX .060" Roch. 4MV 8
454" V8                
  C10   16°B (1) (1) AC R44TX .060" Roch. 4MV(7) 9
  All Others 8°B 8°B (1) (1) AC R44TX .060" Roch. 4MV(7) 10
CHRYSLER CORP.                 
Light Duty(1)                 
225" 6 Cyl. TDC TDC (2) (2) CH BL11Y .035" Hol. 1945 11
318" V8                
    Federal 2°B 2°B (2) (2) CH N11Y .035" Car. BBD 12
    Calif. TDC TDC (2) (2) CH N11Y .035" Car. BBD 13
Heavy Duty (5)                 
225" 6 Cyl. TDC TDC (2) (2) CH BL11Y .035" Hol. 1945 14
318" V8                
  Federal 2°A 2°A (2) (2) CH N11Y .035" Car. BBD 15
  Calif. TDC TDC (2) (2) CH N11Y .035" Car. BBD 16
318"-3 (Motorhome)                
  Federal   TDC (2) (2) CH F10 .035" Car. BBD 17
  Calif.   2°B (2) (2) CH F10 .035" Car. BBD 18
360" V8                
  Federal TDC TDC (2) (2) CH N12Y .035" Hol. 2210 19
  Calif. 4°B 4°B (2) (2) CH N12Y .035" Hol. 2245 20
440" V8                
  Motorhome   8°B (2) (2) CH BL9Y .035" Car. T.Q. 21
  All Others 8°B 8°B (2) (2) CH J11Y .035" Car. T.Q. 22
FORD MOTOR CO.  (1) (1) (1) (1) (1) (1) (1) 23
GMC                 
250" 6 Cyl. 10°B 10°B (1) (1) AC R46TX .060" Roch. 1MV 24
292" 6 Cyl. 8°B 8°B (1) (1) AC R44TX .060" Roch. 1MV 25
350" V8 2-Bbl.   6°B (1) (1) AC R44TX .060" Roch. 2GC 26
350" V8 4-Bbl.                
  Light Duty (4) 6°B 6°B (1) (1) AC R44TX .060" Roch. M4MC 27
  Heavy Duty (5)                
    Federal 8°B 8°B (1) (1) AC R44TX .060" Roch. 4MV 28
    Calif. 2°B 2°B (1) (1) AC R44T .060" Roch. 4MV 29
400" V8                
  Federal 4°B 4°B (1) (1) AC R44TX .060" Roch. 4MV 30
  Calif. 2°B 2°B (1) (1) AC R44TX .060" Roch. 4MV 31
454" V8                
  C1500   16°B (1) (1) AC R44TX .060" Roch. M4MC(7) 32
  All Others 8°B 8°B (1) (1) AC R44TX .060" Roch. 4MV(7) 33
IGNITION TIMING: B  - BTDC, A  - ATDC.
SPARK PLUGS: AL  - Autolite, CH  - Champion.
CARBURETORS: Car.  - Carter, Hol.  - Holley, Roch.  - Rochester.
No HOT IDLE (1) FAST IDLE IDLE CO % Remarks
Man. Trans. Auto. Trans. Man. Trans. Auto. Trans.
RPM Cam Step RPM Man Auto
1 900 550(2) 1800 (3) 1800 (3) (3) (1) Electronic ignition.
2 600 600(2) (3) (3) (3) (3) (3) (2) Auto. Trans. in "D".
3   600(2)   (3) (3) (3) (3) (3) See Engine Tune-Up Decal.
                (4) Light Duty is under 6000 lbs. GVW.
4 800 600(2) 1600 (3) 1600 (3) (3) (5) Heavy Duty is over 6000 lbs. GVW.
                (6) In Calif., 600 RPM.
5 600 600(2) (3) (3) (3) (3) (3) (7) Also Roch. M4MCA&M4MC.
6 700 700(2) (3) (3) (3) (3) (3)  
7 700 700(2) (3) (3) (3) (3) (3)  
8 700 700(2) (3) (3) (3) (3) (3)  
9   650(2)   (3) 1000   (3)  
10 700(6) 700(2) (6) (3) (3) (3) (3) (3)  
11 800 750 1600 2nd 1700 .3(3) .3(3) (1) Light Duty is under 6000 lbs. GVW.
                (2) Electronic ignition.
12 750 750 1500 2nd 1500 .3(3) .3(3) (3) Measured in front of catalyst.
13 750 750 1500 2nd 1500 .3(3) .3(3) (4) Measured at tailpipe.
                (5) Heavy Duty is over 6000 lbs. GVW.
14 700 700 1600 2nd 1700 1.0(4) 1.0(4)  
15 750 750 1700 2nd 1500 1.0(4) 1.0(4)  
16 700 700 1500 2nd 1500 1.0(4) 1.0(4)  
17   700   2nd 1700   1.0(4)  
18   750   2nd 1500   1.0(4)  
19 750 750 1700 2nd 1800 1.0(4) 1.0(4)  
20 700 700 1600 2nd 1600 1.0(4) 1.0(4)  
21   700   2nd 1700   1.0(4)  
22 700 700 1700 2nd 1700 1.0(4) 1.0(4)  
23 (1) (1) (1) (1) (1) (1) (1) (1) See Engine Tune-Up Decal.
24 900 550(2) 1800 (3) 1800 (3) (3) (1) Electronic ignition.
25 600 600(2) (3) (3) (3) (3) (3) (2) Auto. trans. in "D".
26   600(2)   (3) (3)   (3) (3) See Engine Tune-Up Decal.
                (4) Light Duty is under 6000 lbs. GVW.
27 800 600(2) 1600 (3) 1600 (3) (3) (5) Heavy Duty is over 6000 lbs. GVW.
                (6) In Calif., 600 RPM.
28 600 600(2) (3) (3) (3) (3) (3) (7) Also Roch. M4MCA&M4MC.
29 700 700(2) (3) (3) (3) (3) (3)  
30 700 700(2) (3) (3) (3) (3) (3)  
31 700 700(2) (3) (3) (3) (3) (3)  
32   650(2)   (3) 1000   (3)  
33 700(6) 700(2) (6) (3) (3) (3) (3) (3)  
(1) When idle solenoid is used, higher RPM is with solenoid connected; lower RPM with solenoid disconnected.
ENGINE IGNITION TIMING DISTRIBUTOR SPARK PLUGS CARBURETOR No.
Man. Trans. Auto. Trans. Cam Angle Point Gap Type Gap Make & Type
IHC                 
196" 4 Cyl. TDC TDC (1) (1) CH RJ10Y .030" Hol. 1940C 34
304" V8 TDC TDC (1) (1) CH RJ6 .030" Hol. 2210C(5) 35
345" V8                
  Federal Gas TDC(4) TDC(4) (1) (1) CH RJ6 .030" Hol. 2210C5 36
  Calif. Gas 5°B 5°B (1) (1) CH RJ6 .030" Hol. 2210C(5) 37
  LPG 10°B 10°B (3) .016" CH RJ6 .015" Hol. 225IE(7) 38
392" V8                
  Federal TDC(4) TDC(4) (1) (1) CH RJ6 .030" Hol. 4150(6) 39
  Calif. TDC TDC (1) (1) CH RJ6 .030" Hol. 4150(6) 40
JEEP                 
232" 6 Cyl.                
  Federal 5°B   (1) (1) CH N12Y .033 -.037" Car. YF 41
  Calif. 5°B   (1) (1) CH N12Y .033 -.037" Car. YF 42
258" 6 Cyl.                
  Federal 3°B 3°B (1) (1) CH N12Y .033 -.037" Car. YF 43
  Calif. 3°B   (1) (1) CH N12Y .033 -.037" Car. YF 44
304" V8 5°B   (1) (1) CH N12Y .033 -.037" Ford 2100 45
360" & 401" V8 2.5°B 2.5°B (1) (1) CH N12Y .033 -.037" Ford 2100(5) 46
IGNITION TIMING: B  - BTDC, A - ATDC.
SPARK PLUGS: AL  - Autolite, CH  - Champion.
CARBURETORS: Car.  - Carter, Hol.  - Holley, Roch. - Rochester. 
No HOT IDLE(1) FAST IDLE IDLE CO % Remarks
Man. Trans. Auto. Trans. Man. Trans. Auto. Trans.
RPM Cam Step RPM Man Auto
34 525-575 525-575 2000 2nd 2000 .5-2 .5-2 (1) Electronic ignition.
35 650-700 650-700 2200 2nd 2200 2(2) 2(2) (2)Max. Value.
                (3) See Engine Tune-Up Decal.
36 650-700(8) 650-700(8) 2200 2nd 2200(21) 2.5(2) 2.5(2) (4) 5°B with Car. T.Q.
37 625-675 625-675 2000 2nd 2000 .5-1.5 .5-1.5 (5) Also Hoi. 2300G.
38 475 475 (3) (3) (3) 1.5(2) 1(5)2 (6) Also Car. T.Q.
                (7) Also Hoi. 2527.
39 650-700(10) 650-700(10) (3) (3) (3) 2(2) 2(2) (8) 650-700 with Car. T.Q.
40 625-675(8) 625-675(8) (3) (3) (3) (9) (9) (9).5-1.5 with Hoi. 4150.5-2 with Car. T.Q.
41 700   1600 2nd   (2)   (1) Electronic ignition.
42 600   1600 2nd   (2)   (2) See Engine Tune-Up Decal.
                (3) W/O EGR, 700 RPM.
43 650(3) 550(4) 1600 2nd 1600 (2) (2) (4) Auto, trans, in "D".
44 600   1600 2nd   (2)   (4) Also Ford 4350.
45 750   1600 2nd   (2)    
46 750 700 1600 2nd 1600 (2) (2)  
(1) When idle solenoid is used, higher RPM is with solenoid connected; lower RPM with solenoid disconnected.
scientia non olet · About LEMON Manuals