The Blue stripe on the Grille Bar looks good though. Good idea on the screen, the damn love bugs are awful right now!

RT

 

back in 05, I took the clearcoat off my vette, trying to clean those ****'s off

 

I'm lazy. Remind me again exactly how your crankcase ventilation is set up...

 

He's running a hose from the valve covers to the headers

 

So just to clarify, the retard valve works and shows up to 5 inches of vacuum in the crankcase? lol

Are you running a line off each cover to each header or just one? I also assume you are not pulling from a can......

 

bought a generic old school crank evap kit.

had 1 pipe welded to 1 header...pic of headers shows this.

Valve in pipe and connected to VALLEY cover which aslo has a pvc or 1 way check valve.

hooked vac/boost gauge to that and had 4-5 in hg vac at cruise. 5 at wot

checked in tb before and had some oil. checked in blower before and had a small pool of oil.

After connecting to valley cover, had oil in line to header.

Then installed the old school breathers that cam with the evac kit, on to valve covers, and NO more oil in TB.

bought a copper (steel wool looking) cleaning/scrubbing pad at Walmart and wedged a piece into the 5/8" id hose going to the header to help stop oil from leaving the engine.

So, I suppose if you had catch cans, you could use both headers and avoid ANY and ALL oil from returning to engine.

does this make sense?

What I did, was CHEAP and seems to be working well, altho the epa may not approve...lol

 

I am a bit brain dead, after 7 weeks of playing with all this stuff. Ended with the final tweaks to the tune while on the way to the airport.

No dyno runs, but sotp feeling and compare to whipple tune is dramatically different.

a word of advice to anyone running the whipple tune. their SOI (start of injection) table is , in my opinion, totally out to lunch. It causes really high injector pulse width and requires very high fuel system pressures.

end result....punching this big heavy 4wd pig at 65 mph causes the truck to go sideways....scary, but in a good way

thanks to everyone for the help!!

 

Hell yes!

 

How does your torque feel down low with the LT4 cam?

Was the bigger fuel lobe on that thing beneficial to have?

Its a pretty mild cam with a 189/223 duration and a .492/551 lift. 120 lsa, but yours and kb silverados results seem good so far.

It seems like the blower supplements the low intake numbers because there is a huge spread between intake and exhaust on the cam.

I dont think any of the other cams avialable that retain active fuel management (other than the LT4) have a larger fuel lobe than the LT1 cam.

 

fuel lobe on lt4 cam has a bit more lift than the 5.3 cam.

the 5.3 lift is around .5/.5, lt1 .55/.55, but lt4 being a blower cam doesn't need the intake lift.

torque at very low r's is lousy. a 5600 lbs truck with 3.08 gears at 1000-1200 rpm's is weak.....but some tranny tuning takes care of that

if I had to pay someone to replace it, I'd go bigger ( if you like lumpy)

my cam and springs cost $290 shipped and can rev to 6700 rpm all day long, although I have it set to shift at 6300..

a lash cap on the fuel pump is supposed to increase fueling by 10-20%, but I didn't do it