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Ecklers AutoMotive
Username Post: AcDelco R45 vs. R45s sparkplugs        (Topic#353521)
Posts: 2

Reg: 10-19-18
10-19-18 10:41 PM - Post#2749097    

Hey all, I’m new here!
Car specs: 56 bel air air 265 fully stock convertible w/gen and voltage reg.
I was getting black smoke so I changed out very old spark plugs and wires. Bought AcDelco R45S and wires, changed them out one at a time and it fired beautifully. Within minutes I heard a ting-ting-ting and the smoke returned. Is it possible for the piston to strike the extended electrote tip and short? Is it more likely early detonation? Could I have “over torqued” the plugs and could I have damaged the piston?


Edited by Belair1956 on 10-19-18 10:43 PM. Reason for edit: No reason given.

Ecklers AutoMotive
Frequent Contributor
Posts: 1756

Loc: Lake George, NY
Reg: 11-11-15
10-20-18 04:54 AM - Post#2749101    
    In response to Belair1956

Welcome to CT. Take the plugs out and look at them, you will if they hit the pistons.

Ultra Senior Member
Posts: 12230

Loc: Wisconsin..USA
Reg: 09-27-02
10-20-18 07:02 AM - Post#2749108    
    In response to Shepherd

The extended tip on an"S" spark plug will not hit the piston on a 265-283. You may have loosened a piece of carbon or?
I would suggest removing the plugs and then spinning the engine over to blow out any loose carbon. At that time you can examine the plug tips.
The extended tip was made to burn off lead deposits on the plug that caused a high speed miss. Thankfully there is no lead in todays gas.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible

Posts: 2

Reg: 10-19-18
10-20-18 07:53 AM - Post#2749110    
    In response to Gene_Schneider

Removed all plugs and they look fine, I do have a fair amount of oil on the tip of #4 that I previously attributed to a bad vapor valve drawing oil from the valve cover into the carb, but this has been i have a bad lifter/valve/gasket?

Edited by Belair1956 on 10-20-18 08:08 AM. Reason for edit: No reason given.

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