Do you have an aftermarket TC?

SuthernFlames316, what size motor do you have?

 

i have a 5.3

 

I don't know about the 212/218 or not. I went as high as was recommended to me by some very knowledgeable people, but perhaps they were conservative. I ended up with a 205/212, .548/.540, 114+4 from Cam Motion. However, instead of losing low end, I actually gained it, and it pulls hard all the way through red line. I would think this is exactly the kind of torque you would want with 35's on a truck.....but hey, that's just me.

 

Yeah, I don't think any of the actual Thunder Racing (custom cams) will work for your application, except for maybe the Old Man Cam.

You'll probably need to keep the durations around, 206-212 intake / 212-218 exhaust.