Re: [Chevelle-list] Plugs for Big Block?
Diane; If you are useing can be a good thing. What else are you running for Ignition. IE HEI, MSD unit, MSD distriutor. These are all a factor in what to gap your plugs at. Ken
RE: [Chevelle-list] Plugs for Big Block?
Ken' Thanks for confirming that. I had also heard that the coil voltage could regulate spark plug gap. I.E. Accel or better means you can go from .035 to .060, is that true? I've been changing the gap on my 44RT's and have been pretty happy with .055 using an accel coil. :-Diane Diane, Yes, you are correct in what you say about spark plugs. It is not the motor size that dictates the plug that you should use but the heads that you are using. For instance, between a World Products (Dart) head and a Brodix or factory head, they can all use different plugs. It is indeed the depth of the threads in the head that dictate what plug reach you should use. Ken
Re: [Chevelle-list] Plugs for Big Block?
Diane, Yes, you are correct in what you say about spark plugs. It is not the motor size that dictates the plug that you should use but the heads that you are using. For instance, between a World Products (Dart) head and a Brodix or factory head, they can all use different plugs. It is indeed the depth of the threads in the head that dictate what plug reach you should use. Ken
Re: [Chevelle-list] Plugs for Big Block?
In a message dated 9/9/03 10:40:22 AM Eastern Daylight Time, [EMAIL PROTECTED] writes: << Tom, I'm pretty sure it takes the R44/43XLS (the long treads) the R44S seems too short. What are you running in your BB? >> I'm running AC Rapid Fire #4's in mine. Tom
Re: [Chevelle-list] Plugs for Big Block?
Tom, I'm pretty sure it takes the R44/43XLS (the long treads) the R44S seems too short. What are you running in your BB? Trooper > [EMAIL PROTECTED] wrote: > > I know I am coming into this kinda late, but if it is the 13/16 > plug it takes R44's, If it takes the tapered plug, R44T's You can > even use a colder plug which is the R43 or R43T, or a hotter plug R45 > or R45T. > > Tom > > --- > ___ > Chevelle-list mailing list > [EMAIL PROTECTED] > http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net ___ Chevelle-list mailing list [EMAIL PROTECTED] http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net
Re: [Chevelle-list] Plugs for Big Block?
Thanks Chuck, I bought a set of R43XLS plugs yesterday so yes they still make them. My 69 is the flat plug seat. My big concern was the length. The only difference that I can see between the old AC plugs and the new XLS is the new ones are threaded all the way up and the old style is only threaded half way. They will seat at the same depth because the flat seat stops them from going any deeper. Tom, My 69 heads have a flat seat. I also have a set of 70 heads and they are taper. Trooper Chuck Hanson wrote: > > on 9/5/03 4:57 PM, Trooper at [EMAIL PROTECTED] wrote: > > > I just finished a complete rebuild on a 69 396 and wanted some input on > > what number of AC plug to use on the motor. The heads are 69 castings > > w/o the tapered plug seat. They are closed chamber heads. I am also > > running HEI ignition. My big question is do I use AC R43XLS (long > > threads), this is what the book says to use but man they look long, or > > AC R43S (short threads) What are you BB guys running in your motors? > > > > Trooper > > > > ___ > > Chevelle-list mailing list > > [EMAIL PROTECTED] > > http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net > Trooper, > > Didn't remember seeing any responses to this one, so I'll give it a shot... > > I remember installing the XLS plugs back when the cars were new, and if your > heads are the standard "flat washer" type (not the tapered seat style) these > are the correct [plugs for your '69. If your heads are the original '69 > castings, they'll have the standard "flat" plug seats. The tapered seat (or > "peanut") plugs were introduced during the '70 model run... some of the > earliest '70 engines actually used the flat washer style, others used the > tapered seats... even though they both used the same 290 or 291 castings. > Ya just gotta take a look down in the plug opening to tell which ones were > used. > > Besides being "correct" for your '69, Trooper, the XLS plugs put the plug > tip in the combustion chamber for improved spark introduction and increased > ignition efficiency. The question now is, can you still get the XLS plugs? > > Chuck > > ___ > Chevelle-list mailing list > [EMAIL PROTECTED] > http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net ___ Chevelle-list mailing list [EMAIL PROTECTED] http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net
Re: [Chevelle-list] Plugs for Big Block?
I know I am coming into this kinda late, but if it is the 13/16 plug it takes R44's, If it takes the tapered plug, R44T's You can even use a colder plug which is the R43 or R43T, or a hotter plug R45 or R45T. Tom ___ Chevelle-list mailing list [EMAIL PROTECTED] http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net
RE: [Chevelle-list] Plugs for Big Block?
Trooper; I'm just guessing here but isn't the depth of the threads in the head the decider as to the length of plug? I had heard somewhere that the plug should protrude very little into the head, and not recessed to far back up the threads. Someone enlighten us please. ;-Diane ___ Chevelle-list mailing list [EMAIL PROTECTED] http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net
Re: [Chevelle-list] Plugs for Big Block?
on 9/5/03 4:57 PM, Trooper at [EMAIL PROTECTED] wrote: > I just finished a complete rebuild on a 69 396 and wanted some input on > what number of AC plug to use on the motor. The heads are 69 castings > w/o the tapered plug seat. They are closed chamber heads. I am also > running HEI ignition. My big question is do I use AC R43XLS (long > threads), this is what the book says to use but man they look long, or > AC R43S (short threads) What are you BB guys running in your motors? > > Trooper > > ___ > Chevelle-list mailing list > [EMAIL PROTECTED] > http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net Trooper, Didn't remember seeing any responses to this one, so I'll give it a shot... I remember installing the XLS plugs back when the cars were new, and if your heads are the standard "flat washer" type (not the tapered seat style) these are the correct [plugs for your '69. If your heads are the original '69 castings, they'll have the standard "flat" plug seats. The tapered seat (or "peanut") plugs were introduced during the '70 model run... some of the earliest '70 engines actually used the flat washer style, others used the tapered seats... even though they both used the same 290 or 291 castings. Ya just gotta take a look down in the plug opening to tell which ones were used. Besides being "correct" for your '69, Trooper, the XLS plugs put the plug tip in the combustion chamber for improved spark introduction and increased ignition efficiency. The question now is, can you still get the XLS plugs? Chuck ___ Chevelle-list mailing list [EMAIL PROTECTED] http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net
