Year
1967
Engine No. Cyl. Disp. CI (L)
8-429 (7.0)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
44 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
5B
Intake Valve Opens BTDC
39°
Fuel Pump Pressure
5.75 PSI
Idle Speed (Auto Trans)
500 RPM
__________

Year
1968-1969
Engine No. Cyl. Disp. CI (L)
8-472 (7.7)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
44N 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
5B
Intake Valve Opens BTDC
18°
Fuel Pump Pressure
5.75 PSI
Idle Speed (Auto Trans)
550 RPM

Year
1970-1971
Engine No. Cyl. Disp. CI (L)
8-472 (7.7)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R46N 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
8B
Intake Valve Opens BTDC
18°
Fuel Pump Pressure
6 PSI
Idle Speed (Auto Trans)
600 RPM

__________


Year
1970-1971
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R46N 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
7.5B
Intake Valve Opens BTDC
18°
Fuel Pump Pressure
6 PSI
Idle Speed (Auto Trans)
600 RPM

Year
1972-1973
Engine No. Cyl. Disp. CI (L)
8-472 (7.7)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R46N 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
8B
Intake Valve Opens BTDC
34°
Fuel Pump Pressure
5.25-6.25 PSI
Idle Speed (Auto Trans)
600/400 RPM

__________


Year
1972-1973
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R46N 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
8B
Intake Valve Opens BTDC
34°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
600/400 RPM

Year
1974
Engine No. Cyl. Disp. CI (L)
8-472 (7.7)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NS 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
10B
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
5.25-6.25 PSI
Idle Speed (Auto Trans)
600/400 RPM

__________


Year
1974
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NS 0.035
Distributor Point Dwell (Deg.), Point Gap (in.)
30° 0.016"
Ignition Timing Deg. BTDC (Auto. Trans)
10B
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
600/400 RPM

__________

Year
1974
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NS 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
10B
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
600/400 RPM

Year
1975
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
6B
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
600/400 RPM

__________

Year
1975
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
EFI
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
12B
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
39 PSI MIN.
Idle Speed (Auto Trans)
600 RPM

Year
1976
Engine No. Cyl. Disp. CI (L)
8-350 (5.7)
Fuel Delivery
4V Carb.
Engine Manufacturer
Oldsmobile
Spark Plugs - Origional Type, Gap (in.)
R46SX 0.080
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
10B (6B)
Intake Valve Opens BTDC
22°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
600 RPM

__________

Year
1976
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
6B
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
600 RPM

__________

Year
1976
Engine No. Cyl. Disp. CI (L)
8-500 (8.2)
Fuel Delivery
EFI
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
12B
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
39 PSI MIN.
Idle Speed (Auto Trans)
600 RPM

Year
1977
Engine No. Cyl. Disp. CI (L)
8-350 (5.7)
Fuel Delivery
4V Carb.
Engine Manufacturer
Oldsmobile
Spark Plugs - Origional Type, Gap (in.)
R47SX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
10B (6B)
Intake Valve Opens BTDC
22°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
650 RPM

__________

Year
1977
Engine No. Cyl. Disp. CI (L)
8-425 (7.0)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
10B @ 1400 RPM
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
675 RPM

__________

Year
1977
Engine No. Cyl. Disp. CI (L)
8-425 (7.0)
Fuel Delivery
EFI
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
18 @ 1400 RPM
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
39 PSI MIN.
Idle Speed (Auto Trans)
675 RPM

Year
1978
Engine No. Cyl. Disp. CI (L)
8-350 (5.7)
Fuel Delivery
EFI
Engine Manufacturer
Oldsmobile
Spark Plugs - Origional Type, Gap (in.)
R47SX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
10B (8B)
Intake Valve Opens BTDC
22°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
650 RPM

__________

Year
1978
Engine No. Cyl. Disp. CI (L)
8-425 (7.0)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
18B @ 1400 RPM
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
5.25-6.5 PSI
Idle Speed (Auto Trans)
650 RPM

__________

Year
1978
Engine No. Cyl. Disp. CI (L)
8-425 (7.0)
Fuel Delivery
EFI
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
18 @ 1400 RPM
Intake Valve Opens BTDC
21°
Fuel Pump Pressure
39 PSI MIN.
Idle Speed (Auto Trans)
675 RPM

Dead Sled,
Lots of info there. Thanks for posting it.

Year
1980
Engine No. Cyl. Disp. CI (L)
6-252 (4.1)
Fuel Delivery
4V Carb.
Engine Manufacturer
Buick
Spark Plugs - Origional Type, Gap (in.)
R45TSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
15B
Intake Valve Opens BTDC
16°
Fuel Pump Pressure
4.25-5.5 PSI
Idle Speed (Auto Trans)
550 RPM

__________

Year
1980
Engine No. Cyl. Disp. CI (L)
8-368 (6.0)
Fuel Delivery
4V Carb.
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
18B
Intake Valve Opens BTDC
11°
Fuel Pump Pressure
5.5-6.5 PSI
Idle Speed (Auto Trans)
575 RPM

__________

Year
1980
Engine No. Cyl. Disp. CI (L)
8-368 (6.0)
Fuel Delivery
DFI
Engine Manufacturer
Cadillac
Spark Plugs - Origional Type, Gap (in.)
R45NSX 0.060
Distributor Point Dwell (Deg.), Point Gap (in.)
Electronic (HEI)
Ignition Timing Deg. BTDC (Auto. Trans)
10B
Intake Valve Opens BTDC
11°
Fuel Pump Pressure
12-14 PSI
Idle Speed (Auto Trans)
575 RPM

some where I have the 80-present specs I'll keep looking

shouldnt the sparkplug gap on the 74 500 and 472 be .060 with the hei dist?

shouldnt the sparkplug gap on the 74 500 and 472 be .060 with the hei dist?

if it has HEI yes if not those specs above are for piont type

if it has HEI yes if not those specs above are for piont type

yeah thats what im trying to say. the 4th post and the 3 engine described is a 74 500 with hei, but you have the gap at .035 when it should be .060 just wanted to give you the heads up so people done set the gap wrong.

yeah thats what im trying to say. the 4th post and the 3 engine described is a 74 500 with hei, but you have the gap at .035 when it should be .060 just wanted to give you the heads up so people done set the gap wrong.


ahh fixed it

Any chance of getting specs for a 79 deville?


thanks

79 specs should be the same as 78 as far as I know.

According to Chilton 1984 Parts and Labor Guide:

'79 425 W carb = 23 btdc checked at 1400 RPM. (not the same as 1978)
Fuel injected = 18 btdc which IS the same as 1978.

Some of these books AND the specs posted here are incorrect. They show figures of how many degrees before top dead center the intake valve opens on engines of different years. When you look up the internal engine items such as camshafts, timing gears, etc. they are all the same exact part numbers. Something is wrong.

I said what I said because there were no physical changes between 78 and 79 engines. Who has got a factory service manual, anyone?

Since there is some interest and knowledge regarding "Old School" Caddy's - Can anyone direct me to any info on buying the right radial tires for a 1970 Coup Deville Convertible.

the ones one Bebe are (I think) the wrong size - my speedo is off by about 8 miles an hour and the exhaust (on a rare occasion) bottoms out.