Picked up some NGK-tr55s. I'm running all motor.....

what should I gap them to?

I used the search but didnt find a good answer.

 

i did .055

 

.055-.060 should do it up just fine..

.060 is factory specs..

 

just a suggestion, but you should go with a ngk tr6 cuz of your cam. i know your probably a 5.3 and im a 6.0, but when i did my first dyno tune they took my stockers out and put in tr6's and the truck made 6 more ft/lbs of torque at the rear wheels. it made some more hp too, but i dont remember how much. like i said just a suggestion. maybe something to ask more about, cuz it worked in my case but i dont know if it would work in your case.

 

I agree on the spark plug gap, .055-.060 will be just fine. I gapped mine at .055. Interesting info that RED04REGENCYRST posted, but I wonder if there were any other factors involved (heat soak, dyno variances, etc.)...tough to say...