clean04silverado

Id like to get your guys opinions on some of the cams I have picked out. First off the truck is a 99 RCSB with the 5.3 in it. I have a yank 2600 stall converter I'll be putting in shortly. I'm looking to keep it a fairly mild set up but am looking to wake the truck up some while keeping it SMOG LEGAL. I'm looking to run the Texas Speed Stage 3 cam but am unsure which lobe separation I should go with. I've heard less overlap is better but I heard a tighter lobe separation is harder to tune and will have more lope to it. Has anyone in CA run this cam and passed the sniffer?

TSP stage 3 low lift 216/220 .550 lift
- 114 LSA (-10 degrees overlap)
- 113 LSA (-8 degrees overlap)
- 112 LSA (-6 degrees overlap)

clean04silverado

I'm also looking at the GM Performance hot cam part # 88958753

219/228 .525/.525 Lift on a 112 LSA (-1.5 overlap)

Slow05CC

iTrader: (1)

I have heard of people clearing smog with the TSP 224r on a 114 in the LS1 and 5.3 motor. That would be -4 degrees of overlap.

-Avery

clean04silverado

Good to know! Thank you!

Richardman1992

iTrader: (5)

I have heard the opposite, you want more negative overlap in order to pass smog. I know my comp 212/218 low lift passed in Oceanside when I was still stationed in Camp Pendleton. I used to know of a formula to determine overlap, but I forgot what it was and lost the paper I had it written on long ago.

Slow05CC

iTrader: (1)

You are correct there. The more positive the overlap, the harder it would be to get through smog. Positive overlap is when both valves are open at the same time.

Overlap is calculated as:

Intake duration 212 + Exhaust duration 218 = 430

430 / 2 = 215

112 + 112 = 224 (LSA+LSA)

215 - 224 = -9 degrees of overlap

Mark408

BUMP! I know this is from last year but did you ever go with a cam.? Found this thread through google. I've been looking at the TSP Stg. 3 cam 112 LSA also but I have a 6.0l LQ4.