Holley Spark Control Valve

Holley Spark Control Valve 70-5B

12 Review(s)

Your Price: $10.95

Thread: 1/2" - 27

Part Number: 70-5B

Availability: In Stock

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Description
Customer Reviews

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.

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

AMERICAN MOTORS/NASH/RAMBLER

1959-60

196

AMERICAN MOTORS/NASH/RAMBLER

1963-65

196

CHEVROLET

1958-61

CORVETTE 283 230 HP

CHEVROLET

1958-65

283, 327 250HP, POLICE SPEC 348 INCL CANADA & CORVETTE

CHEVROLET

1958-65

283, 327, 348

CHEVROLET

1962-65

CORVETTE 327 250HP

CHEVROLET

1964-65

327 INCL CORVETTE

CHEVROLET/GMC TRUCK

1960-65

240, 270, 305

CHRIS CRAFT

283" 4.6L 8CYL.

EDSEL

1959-60

223

EDSEL

1959-60

223

FORD TRUCK

1934-57

239, 272

FORD TRUCK

1934-57

256, 279, 317

FORD TRUCK

1952-57

215, 223

FORD TRUCK

1952-67

144, 170, 223, 262 (INCL ECONOLINE)

FORD TRUCK

1952-67

144, 170, 223, 262 (INCL ECONOLINE)

FORD/MERCURY

1932-56

239" 3.9L, 272" 4.5L, 90", 100 H.P.

FORD/MERCURY

1952-57

215, 223

FORD/MERCURY

1952-67

144, 170, 223

FORD/MERCURY

1952-67

144, 170, 223

FORD/MERCURY

1956

292, 312 (INC POLICE SPECIAL)

FORD/MERCURY

1956

OPTIONAL 312 MERCURY ENG

FORD/MERCURY

1957

312 (2 CARBS)

FORD/MERCURY

1962-69

144, 170, 200 (INC REPL CARB)

I.H.C.

1950-53

MODELS W/HOLLEY 1 BBL EXC R-841A THRU R-1421A

I.H.C.

1950-53

MODELS W/HOLLEY 1 BBL R-841A THRU R-1421A

I.H.C.

1957-58

BD-264

I.H.C.

1960-62

152

I.H.C.

1960-68

152, 196

I.H.C.

1966

220 BG-241

I.H.C.

1966-68

220, BG220

I.H.C.

1968

BG-241, BG-265

LINCOLN IND

1956

368

PACKARD

1955-62

REPL CARB

STUDEBAKER

1960-62

259, 289 LARK, HAWK

STUDEBAKER TRUCK

1960-62

289, 5e & 6e-13, -28, -40

TOWMOTOR

1967

F163

Click on Carb Number For Associated Parts.

CARBURETOR NUMBERS:

Rating Snapshot

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Average Customer Ratings

5.0

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Hobbie Restorationist

This spark control valve (along with the gasket) was shipped right away and fit perfectly. It was just what my 1 bbl Holley 1940 needed, as the port was simply capped off and not in use. My project was still utilizing the vacuum advancing distributor, and without this spark control valve, the vac-advance will not work as designed during all driving speeds.

Did you find this helpful? 5 of 6 Found Helpful

Reviewed by: Ross P. from Portland, OR on 12/29/2014

Owner

Satisfied

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: James omally from Phoenix az on 10/30/2015

1904 Holley part

Always use OEM style parts that Mike supplies, works perfect

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Reviewed by: Glenn from Milltown on 11/12/2023

Holley Spark Control Valve

We have ordered from Mike's several times. The ordering is stress free, the prices are very fair, the shipping is timely; and so far all the parts have been correct and of good quality. Will continue ordering from Mike's!

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Reviewed by: Brenda from Alabama on 3/10/2023

Hobbiest

Great product. Fit and works well!

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Reviewed by: Mark Maxwell from La Grange Ca on 4/26/2022

Quality part

This spark control was an exact fit for my older carb. Mike's has anything needed. Great customer service as they helped me with some technical advise as well.

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Reviewed by: Jason Wallen from Greeneville on 9/28/2021

car fan

Good. Quality. Good. Price

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Reviewed by: joezimmerman from Scottsdale. Az on 10/31/2020

well made ....fixed the problem I was having with hesitation

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Reviewed by: richard from pleasant mount on 12/1/2019

Owner

Perfect replacement, quick shipment. Always satisfied buying parts here. Great product, great service!

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Reviewed by: Larry from Oregon on 3/16/2019

n/a

Item shipped and received promptly. I haven't had a chance to install yet. Item looks good. I would order parts from them again.

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Reviewed by: Frank Faiello from Sacramento on 5/8/2018

Holley Spark Control Valve 70-5B

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.

Rating Snapshot

Average Customer Ratings

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