I have visited this site before and learned lots of good info here so thought I would finally post a question. It's been years since I messed with my 09 and now need some expert advice. I was trying to install new spark plugs and noticed that they only go in about 4 threads. Is this the way it was designed, to only catch that many untill it bottoms the crush ring. I'm using the AC44's and the heads are the stock 690's. Do I need to retain the crush ring or can I leave it out. Thanks guy is advance for helping.
Spark plug ?
- Thread starter AZCharlie
- Start date
Charlie, Whoa fella!!! AC 44N or AC 43N not 44 !!!! 409s use long reach plugs. Current AC number is R43XLS or R44XLS for warmer plug.
Autolite 64
My Autolite 64 plug will turn out 5 turns from a compressed washer. That is 3/8 of an inch in depth which is deeper than the head is threaded. If you are comming out 4 turns from compressed washer seat I think that is enough. Count the turns out from seat. Takes a lot to compress the washer. Use a torque wrench the first time at least. That way you are sure the washer is all the way down.
My Autolite 64 plug will turn out 5 turns from a compressed washer. That is 3/8 of an inch in depth which is deeper than the head is threaded. If you are comming out 4 turns from compressed washer seat I think that is enough. Count the turns out from seat. Takes a lot to compress the washer. Use a torque wrench the first time at least. That way you are sure the washer is all the way down.
Thank you models916 for clarifying this. I also can get the five turns after compressing the washer. All these years and I never noticed this, the threads are so long you assume that they all thread. I guess I am good to go, try to fire it as soon as I get my new MSD dissy and wire it all up. Thanks all, Charlie
mercsrus51
Active Member
Spark Plug !
I just installed Autolite 65's in my 348, and its never ran so good....
I got these from the local speed shop,, and I have known these people for over twenty five years... My question is,, is this a correct plug for the 348 mild cam,,, tri power...???:
I just installed Autolite 65's in my 348, and its never ran so good....
I got these from the local speed shop,, and I have known these people for over twenty five years... My question is,, is this a correct plug for the 348 mild cam,,, tri power...???:
Models, Correct----- larger no. means warmer plug ( Autolite)