Spark Plug Question(s) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DT1 · 07-13-2016, 12:00 PM

With the exception of a mild RV cam and a HEI distributor, my SB Gen1 350 is completely stock.
I decided that after 50,000 miles it was about time to replace the plugs. The thing I immediately noticed was that they are burning very lean. The plugs are AC Delco R44TS.
I was wondering if I should go with a shorter tip R44T or maybe a colder R43TS.
Other than the lean condition, the engine runs great and doesn't ping under any condition.

Wrenchbender Ret · 07-13-2016, 03:01 PM

I would go with the r43ts plugs.

Coley · 07-13-2016, 04:51 PM

The last time I checked I think I switched from R44 plugs over to R45TS plugs....no problems.
To my understanding the R45 is a slightly 'hotter' plug than the R44 which I believe makes it better for short haul, stop and go stuff. (Someone correct me if I'm wrong on this....)
Both fit fine and work fine....just different duty cycles and applications.

Coley

toolboxchev · 07-13-2016, 05:51 PM

I use the R45ts, and have tried the 44's. The lean condition is tied to the carb. I like the hotter plug for economy and complete burn as I use about 1 quart of oil every 3,000 miles.

You could also go with the R45 which is a colder plug than the TS (Tapered Seat) and the most likely manufacture a R44 also.

Take a look at them side by side next time you are in the auto parts store.

100 ways to burn, pick your poison for your set up. I have an Eddy carb, Stock Hei with Pertronix Module and Accel Super Coil sitting on top. I have found todays E10 Likes a hotter spark.

Pretty stock here otherwise.

7tee · 07-13-2016, 06:23 PM

R45TS for me, I was running too lean and I changed my 600 Holley jets from a factory #66 to #69 and might could go a #70 but it runs pretty darn good where it's at...Ed

GASoline71 · 07-13-2016, 06:44 PM

Also, when running an HEI ignition, open the plug gaps to at least a minimum of .045

Gary

toolboxchev · 07-13-2016, 06:55 PM

Quote:

Originally Posted by gasoline71

also, when running an hei ignition, open the plug gaps to at least a minimum of .045

gary

x2

07-13-2016, 12:00 PM	#1
DT1 Registered User Join Date: Oct 2009 Location: Gardnerville Nv No Mo Cali!! Posts: 869	Spark Plug Question(s) With the exception of a mild RV cam and a HEI distributor, my SB Gen1 350 is completely stock. I decided that after 50,000 miles it was about time to replace the plugs. The thing I immediately noticed was that they are burning very lean. The plugs are AC Delco R44TS. I was wondering if I should go with a shorter tip R44T or maybe a colder R43TS. Other than the lean condition, the engine runs great and doesn't ping under any condition.

07-13-2016, 03:01 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Spark Plug Question(s) I would go with the r43ts plugs.

07-13-2016, 04:51 PM	#3
Coley Registered User Join Date: Oct 2011 Location: Victoria, B.C Posts: 3,794	Re: Spark Plug Question(s) The last time I checked I think I switched from R44 plugs over to R45TS plugs....no problems. To my understanding the R45 is a slightly 'hotter' plug than the R44 which I believe makes it better for short haul, stop and go stuff. (Someone correct me if I'm wrong on this....) Both fit fine and work fine....just different duty cycles and applications. Coley __________________ ....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500

07-13-2016, 05:51 PM	#4
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: Spark Plug Question(s) I use the R45ts, and have tried the 44's. The lean condition is tied to the carb. I like the hotter plug for economy and complete burn as I use about 1 quart of oil every 3,000 miles. You could also go with the R45 which is a colder plug than the TS (Tapered Seat) and the most likely manufacture a R44 also. Take a look at them side by side next time you are in the auto parts store. 100 ways to burn, pick your poison for your set up. I have an Eddy carb, Stock Hei with Pertronix Module and Accel Super Coil sitting on top. I have found todays E10 Likes a hotter spark. Pretty stock here otherwise.

07-13-2016, 06:23 PM	#5
7tee Registered User Join Date: Mar 2015 Location: Fletcher, N.C. Posts: 309	Re: Spark Plug Question(s) R45TS for me, I was running too lean and I changed my 600 Holley jets from a factory #66 to #69 and might could go a #70 but it runs pretty darn good where it's at...Ed __________________ 1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado...



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.