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346 soft plug sizing?

Started by gary griffin, December 14, 2017, 11:15:02 AM

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gary griffin


I have seen many posts through the years and it seems like some of our plugs are odd sizes no longer produced. Is there a listing of sizes and how so we compensate for any that are not available?
Gary Griffin

1940 LaSalle 5029 4 door convertible sedan
1942 Cadillac 6719 restoration almost complete?
1957 Cadillac 60-special (Needs a little TLC)
2013 Cadillac XTS daily driver

Steve Passmore

Not that odd Gary, and all available. There are some odd sizes out there that people attempt to use and they fail. Ask how I know ::)
Steve

Present
1937 60 convertible coupe
1941 62 convertible coupe
1941 62 coupe

Previous
1936 70 Sport coupe
1937 85 series V12 sedan
1938 60 coupe
1938 50 coupe
1939 60S
1940 62 coupe
1941 62 convertible coupe x2
1941 61 coupe
1941 61 sedan x2
1941 62 sedan x2
1947 62 sedan
1959 62 coupe

D.Yaros

Pardon my ignorance, but to what does "soft plug sizing" refe?.  Not a term with which I am familiar.
Dave Yaros
CLC #25195
55 Coupe de Ville
92 Allante
62 Olds  

You will find me on the web @:
http://GDYNets.atwebpages.com  -Dave's Den
http://graylady.atwebpages.com -'55 CDV site
http://www.freewebs.com/jeandaveyaros  -Saved 62 (Oldsmobile) Web Site
The home of Car Collector Chronicles.  A  monthly GDYNets newsletter focusing on classic car collecting.
http://www.scribd.com/D_Yaros/

gary griffin

#3
Often called freeze plugs they are plugs that keep water in the block. Casting with a sand core and mold leaves a void for water to cool the engine. After cooling down the block is shaken until all of the sand has been removed. In some cases casting sand stays in the block and later causes problems, The soft plug often called freeze plug is placed in the hole that sand exited through.
Gary Griffin

1940 LaSalle 5029 4 door convertible sedan
1942 Cadillac 6719 restoration almost complete?
1957 Cadillac 60-special (Needs a little TLC)
2013 Cadillac XTS daily driver

The Tassie Devil(le)

We call them Welsh Plugs.

Bruce. >:D
'72 Eldorado Convertible (LHD)
'70 Ranchero Squire (RHD)
'74 Chris Craft Gull Wing (SH)
'02 VX Series II Holden Commodore SS Sedan
(Past President Modified Chapter)

Past Cars of significance - to me
1935 Ford 3 Window Coupe
1936 Ford 5 Window Coupe
1937 Chevrolet Sports Coupe
1955 Chevrolet Convertible
1959 Ford Fairlane Ranch Wagon
1960 Cadillac CDV
1972 Cadillac Eldorado Coupe

Steve Passmore

Quote from: The Tassie Devil(le) on December 14, 2017, 08:23:15 PM
We call them Welsh Plugs.

Bruce. >:D

The type of plug used was designed by the Welsh brother in Michigan turn of the last century hence the name. Other types of plugs were used prior to that by car manufacturers.
Steve

Present
1937 60 convertible coupe
1941 62 convertible coupe
1941 62 coupe

Previous
1936 70 Sport coupe
1937 85 series V12 sedan
1938 60 coupe
1938 50 coupe
1939 60S
1940 62 coupe
1941 62 convertible coupe x2
1941 61 coupe
1941 61 sedan x2
1941 62 sedan x2
1947 62 sedan
1959 62 coupe

The Tassie Devil(le)

Thanks Steve.   Love it when I learn something new, and worthwhile.

Bruce. >:D
'72 Eldorado Convertible (LHD)
'70 Ranchero Squire (RHD)
'74 Chris Craft Gull Wing (SH)
'02 VX Series II Holden Commodore SS Sedan
(Past President Modified Chapter)

Past Cars of significance - to me
1935 Ford 3 Window Coupe
1936 Ford 5 Window Coupe
1937 Chevrolet Sports Coupe
1955 Chevrolet Convertible
1959 Ford Fairlane Ranch Wagon
1960 Cadillac CDV
1972 Cadillac Eldorado Coupe

31355Aman

Quote from: Steve Passmore on December 14, 2017, 11:25:59 AM
Not that odd Gary, and all available. There are some odd sizes out there that people attempt to use and they fail. Ask how I know ::)

Can you tell me what sizes are used on 31 355A engine (both heads and block) or suggest reference for same??
My dial caliper indicates 1.875 and 1.000, but these readings are taken from dirty rusty components.

Steve Passmore

Sorry, I'm not familiar with those engines. Perhaps someone else will chime in?
Steve

Present
1937 60 convertible coupe
1941 62 convertible coupe
1941 62 coupe

Previous
1936 70 Sport coupe
1937 85 series V12 sedan
1938 60 coupe
1938 50 coupe
1939 60S
1940 62 coupe
1941 62 convertible coupe x2
1941 61 coupe
1941 61 sedan x2
1941 62 sedan x2
1947 62 sedan
1959 62 coupe

Bobby B

Gary,
Hi. Those crossover plugs are 1-1/4". Dorman Part # 550-017.
                                                                    Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

Jeff Maltby 4194

Jeffo 49er chapter

CLC 1985
Honda Gold Wing GL1500