I am building a high compression all motor LS and have a question. I am using the stock cams to break the motor in (and give me time to save some money for the cams/cam gears/and tune lol) Question being, only mods to the motor are going to be PR3 pistons (around 10.8:1 compression), built head with Crower valve train, ported ect ect. I have a AEM wideband (not yet but soon) and a B&M FPR and gauge, can I run the motor to break it in with stock cams on the stock ECU with no problems? Just better flowing top end and higher compression is different from stock. After 2,500 miles or so when the motor is broken in I will be taking it to Charm City, getting Brian Crower Stage 2 cams and adj. gears and tuned on S100 purchased/installed by them by there reccomendation..

 

Simple answer: Monitor your air fuel ratios on the wideband.

 

That ^

 

Word, that's what I assumed. What would be target AFR's for this setup?? Sorry I'm a noob at tuning but wanting to learn about it

 

I'd say 12.0 to 13.0 under wide open throttle.

 

Get your target to idle around 14.7 then go from there.

 

What about WOT and partial what should those be around safely? I'm not trying to get optimum power right now I just want to break the motor in safely then I can put the cams in and get it dyno tuned.

 

Using pump gas (91-93):
All motor vehicles: 12.9-13.4:1 (Full Throttle)
Partial Throttle/Idle: 15.5:1 (Light Throttle) 14.7-13.6:1 (Partial to Mid Throttle)