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  6. Holley Spark Control Valve 70-5B
Holley Spark Control Valve 70-5B
Holley Spark Control Valve

Holley Spark Control Valve 70-5B

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Your Price: $10.95
Thread: 1/2" - 27
Part Number: 70-5B
Availability: In Stock
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Spark control valve fits 1 & 2 barrel carburetors.

Sits on the outside of the Holley carburetors.

The spark control valve is used to control the vacuum to the distributor.


SPECS:
  • Thread: 1/2" - 27
CARBURETOR:
  • Holley: 94, 2100, 2110, AA-1
  • 1904
  • 1909
  • 1940
  • 4000
  • Autolite 1100, 1101
Some of the older spark valves had a longer stem. This is simply a design difference. The new valves work the same.
The one on the right is the new valve and replaces the one on the left.
Spark Valve

REPLACES OE: CE-72

All manifold vacuum to the distributor passes through the spark control valve. Under normal road load conditions, the spark valve is held open against the pressure of a pre-set factory calibrated spring by a combination of atmospheric pressure outside of the diaphragm and manifold vacuum from within. When accelerating, manifold vacuum momentarily drops below a predetermined point and the calibrated spring closes the spark valve, shutting off the largest of two passages through the spark valve. The passage left open is a cali­brated by-pass which permits a small amount of manifold vacuum to reach the distributor vacuum line. Closing the valve prevents excessive spark advance, while the manifold vacuum passing through the spark valve by-pass prevents full spark retard. As engine speed approaches the throttle setting, manifold vacuum increases sufficiently to open the spark valve and allow a higher vacuum to operate the distributor. This carburetor also employs a distributor passage ball in the manifold vacuum passage to prevent weakening of the vacuum to the distributor whenever venturi vacuum be­comes stronger than manifold vacuum. By use of the spark valve, more efficient spark advance upon acceleration is obtained without the excessive "ping" of the normal road load part throttle spark advance or the sluggishness of wide-open throttle spark retard.
The spark valve functions in a similar manner to provide an intermediate spark retard whenever the load on the engine is increased to a degree where the normal road load spark advance would be too great and the wide-open throttle spark retard would reduce the efficiency of the engine.
Load O Matic Distributors
Used on Ford applications from 1949 to 1967. This type of distributor doesn't use a mechanical advance and depends on vacuum from the carburetor. Carburetor for this type of distributor typically used a spark control valve. Our new N1904 1 barrel carburetor had the functionality of the spark control valve built in and will work with your Load O Matic distributor.

APPLICATIONS:
You must match your carburetor number to get the correct part.
MAKE
YEAR
MODEL
CYLS
AMERICAN MOTORS/NASH/RAMBLER
1959-60
196
6
AMERICAN MOTORS/NASH/RAMBLER
1959-60
196
6
AMERICAN MOTORS/NASH/RAMBLER
1963-65
196
6
CHEVROLET/GMC TRUCK
1960-65
240, 270, 305
8
EDSEL
1959-60
223
6
EDSEL
1959-60
223
6
FORD TRUCK
1934-57
239, 272
8
FORD TRUCK
1934-57
256, 279, 317
8
FORD TRUCK
1952-57
215, 223
6
FORD TRUCK
1952-67
144, 170, 223, 262 (INCL ECONOLINE)
6
FORD TRUCK
1952-67
144, 170, 223, 262 (INCL ECONOLINE)
6
FORD/MERCURY
1932-56
239" 3.9L, 272" 4.5L, 90", 100 H.P.
8
FORD/MERCURY
1952-57
215, 223
6
FORD/MERCURY
1952-67
144, 170, 223
6
FORD/MERCURY
1952-67
144, 170, 223
6
FORD/MERCURY
1956
292, 312 (INC POLICE SPECIAL)
8
FORD/MERCURY
1957
312 (2 CARBS)
8
FORD/MERCURY
1962-69
144, 170, 200 (INC REPL CARB)
6
I.H.C.
1950-53
MODELS W/HOLLEY 1 BBL EXC R-841A THRU R-1421A
6
I.H.C.
1950-53
MODELS W/HOLLEY 1 BBL R-841A THRU R-1421A
6
I.H.C.
1957-58
BD-264
6
I.H.C.
1960-62
152
6
I.H.C.
1960-68
152, 196
6
I.H.C.
1966
220 BG-241
6
I.H.C.
1966-68
220, BG220
6
I.H.C.
1968
BG-241, BG-265
6
LINCOLN IND
1956
368
8
TOWMOTOR
1967
F163
Click on Carb Number For Associated Parts.
CARBURETOR NUMBERS:

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