I'm new to these engines because I just bought my 03 silverado. I'm wanting to get some power/sound out of her yet still have it be a good DD. I've searched a lot and received a lot of information but would like some responses first hand. Here's the list so far, I'm not wanting to do tooo much, just some minor stuff.
Bolt ons before cam/etc...:
-Edelbrock shorty headers (I want long-tubes but not sure what I can get as far as smog legal in CA.)
-True duals with magnaflows/x-pipe custom by muffler shop
-S&B CAI
All the rest of these would be done on one shot
-TR Cam(220/220 .551/.551 114) What's the difference from 114 to 112? Do I need new valve springs with this cam?
-Yank 3000 converter
-HD2 shift kit
-B&M trans cooler
-And a Nelson tune
Any advice/changes for the better? The first 3 mods I'll being doing right away, one by one. Then probably early next year get the rest done by a good shop.
TIA, Jonathon

 

you'll need Comp 918 valve springs for that cam

id suggest getting 4.10 gears and a posi (detroit trutrac IMO)

sounds like a good combo

 

Thanks! I thought I needed those valve springs. I was reading about other guys using them. The truck is 4x4 w/ 3.73 gears. I do a lot of highway driving, would the 4.10 affect gas mileage compared to what I have now? I do/will need posi If I did take it to the track occasionally I can just run it in 4Hi right? Expecting maybe 14's with those mods? I'm not looking to race it though, just a powerful/good sounding DD.

 

since you already have 3.73s its not worth it IMO to spend around $1k on a gear and posi swap (have to swap front and rear) just get a trutrac in the rear and you'll be good to go

yes run in 4hi at the track

reg cab , ext cab, or crew cab

 

Are these the right valve springs? http://store.summitracing.com/partde...5&autoview=sku
Thanks

 

I thought the 3.73 were ok. I plan on doing 4.56 if I eventually get a cognito lift with 37's or 38's....but thats a longggg ways away. My truck is an ext cab long bed. I'm going to look into that trutrac posi unit. Pretty reliable and strong?

 

yes, good posi unit, i havent heard of one breaking yet

some of the eaton posi's are wearing out as the have clutches the trutrac doesnot and therefore has nothing to wear out

 

and yes those are the correct valve springs

 

Thanks, I'm going read up on it. Not sure as to what rearend I have though. HMM, I'll have to figure that out. You think 14's would be reasonable with a good tune?

BTW- Very fast responses!!!

 

http://www.4wheelparts.com/4wp/produ...TL&expand=sub3
I'm probably the first choice as 12-bolt with 3.73's.