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Username Post: 1955 spark plugs        (Topic#38151)
bbqbrisket 
Very Senior Member
Posts: 1181
bbqbrisket
Loc: nj
Reg: 01-30-03
06-27-03 06:52 AM - Post#256565    

I see that the spark plug for a 55 was 44-5. Is that 1 type of plug or two different ones (44 and 45)?
I've got an R-45 in mine...is that correct?
thanks
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Anonymous 

Re: 1955 spark plugs
06-27-03 06:54 AM - Post#256566    
    In response to bbqbrisket

You probably mean 44-S, not 44-5.

 
bbqbrisket 
Very Senior Member
Posts: 1181
bbqbrisket
Loc: nj
Reg: 01-30-03
Re: 1955 spark plugs
06-27-03 07:14 AM - Post#256567    
    In response to

Jal,
Nope, unless its a misprint in both chev service manual and chiltons. I do see in the chev service manual one get a get a 43-5 and 46-5 for different uses. But I've been using an R45
and I don't know if thats correct a replacement or what.
bubba
http://img239.imageshack.us/img239/6238/5chevys2du.jpg


 
Robert_May 
Old as Dirt Member
Posts: 6939

Loc: San Marcos, CA USA
Reg: 01-03-02
Re: 1955 spark plugs
06-27-03 08:11 AM - Post#256568    
    In response to bbqbrisket

The R-45 plug is the resistor plug version of what is normally run in your engine. If you are running solid wires then I'd use that plug otherwise, replace them when it is time to do so with the 45 plug in some other variation, I run 45 plugs myself.
Robert May Fat? Eat less and you will get thinner!


 
Anonymous 

Re: 1955 spark plugs
06-27-03 08:59 AM - Post#256569    
    In response to bbqbrisket

As Robert points out - the use of an AC 45 or R45 is acceptable in your engine bbq.

Jaly, the original plugs were dash numbered.
Wanna set??? Every now and then I come across them.

Personally, I prefer the NGK plug because it is plated and doesn't rust - as the AC's do after a few months.

 
Anonymous 

Re: 1955 spark plugs
06-27-03 09:16 AM - Post#256570    
    In response to

It's a new one on me (which happens several times a day).

What's "dash-numbered" mean?

 
bbqbrisket 
Very Senior Member
Posts: 1181
bbqbrisket
Loc: nj
Reg: 01-30-03
Re: 1955 spark plugs
06-27-03 09:22 AM - Post#256571    
    In response to

I wanna know what the dash means too.
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Anonymous 

Re: 1955 spark plugs
06-28-03 12:41 AM - Post#256572    
    In response to

What I meant by dash numbered is the original plugs were...

44-5

They didn't use the "number" alone as in 44 or 45.

 
Gene_Schneider 
Ultra Senior Member
Posts: 11082

Loc: Wisconsin..USA
Reg: 09-27-02
Re: 1955 spark plugs
06-28-03 02:16 AM - Post#256573    
    In response to bbqbrisket

The AC 44-5 spark plugs covered both the 44 and 45 heat ranges.The earlier 216 engine used a 46-5 which was a "hotter" version.There were smooth sided insulator plugs.Chevrolet was one of the only cars that used them (from 1949-1955)In 1956 the ribbed insulator plugs were factory installed and the conventional 44 or 45 or 46 plugs were used.Eventually the 44-5 plugs were discontinued and the 45 etc. became the replacement.The R or resistor plug is the modern replacement.I have used those for years in my cars with the resistance wires with no problem.The AC plugs with the entended tip have a number that ends in an S.These are of no advantage today but were introduced back when leaded gas caused lead deposits to form of the spark plug tips.This would cause a high speed miss.The longer tip was used to burn off the deposits due to being in the hotter combustion area.If a car was used for city driving and using leaded gas it would develope a bad high speed miss and replacing the plugs was the only cure.I used to replace the plugs every 2000 miles on my "57.This is one of the great advantages of todays unleaded gas.
ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
bbqbrisket 
Very Senior Member
Posts: 1181
bbqbrisket
Loc: nj
Reg: 01-30-03
Re: 1955 spark plugs
06-28-03 02:43 AM - Post#256574    
    In response to Gene_Schneider

gene,
that indeed is a complete answer. That fully answers the question thanks...
What causes plugs to continually foul??
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Rick_L 
Honored Member
Posts: 25841

Loc: Katy, Tx, USA
Reg: 07-06-00
Re: 1955 spark plugs
06-28-03 03:11 AM - Post#256575    
    In response to Gene_Schneider

Gene, a very good answer, but I must disgree with you on one small point. The extended tip plugs are just as useful today as in the past, and they do the same thing now as then.

 
Gene_Schneider 
Ultra Senior Member
Posts: 11082

Loc: Wisconsin..USA
Reg: 09-27-02
Re: 1955 spark plugs
06-28-03 07:55 AM - Post#256576    
    In response to Rick_L

The advantage of the extended tip plugs can be a matter of opinion.I don't mean that they are bad-just not necessary under normal conditions.I would say best for an engine that is operated at low speeds most of the time.When I had my 'first ' new '57 I found that Champion J12Y extended tip plugs worked the best.Autolite had the first extended tip plugs in 1955.ACs didn't come out till much later......An engine that fouls plugs (when driving) has a problem (if the plug is of the correct heat range).If it gas fouls-black-dry-sooty-too much gas.If oily, oil is getting into combustion chamber-most common on small blocks due too the over abundence of oil to the rocker arms.Good valve seals and guides are needed.Oil coming past the rings seldom fouls plugs.A hotter plug will foul less but won't "repair" the problem.A AC 46 could be used- but an extended plug may oil foul sooner as it extends farther into the combusyion chamber-at least this has been my experiance.
ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
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