On my LT1(know it was a car and not a truck) I had a 236/242dur .578/.596 lift on a 111 lobe sep and it was just about perfect I know I probably can't get away with one quite that big, but I would like to know if anyone on a truck is using one even close to that size with stock intake manifold, and heads.

Aaron

 

I am about to go with a 228/228 .588 .588 112 on my 5.3.

 

There was a thread started here where car craft installed a huge LPE cam in a 5.3L w/ headers. Made 100hp in the upper rpm, but lost as much as 50 down low. Your upper tq numbers past 5250rpm will start to drop off extremely with a large cam. The one cam had 229/242 duration at .050. This sent peak hp to 6800rpm.

That is what you would call "overcammed"

I'd really be interested in seeing a 5.3 motor spun to 6800rpm w/ a lsx intake, large cam on a very tight lobe seperation angle, cleaned up the heads and maybe a 4000 stall converter w/ a 2.5str

Thats whats cool about custom ground camshafts. You can get them to do what you want for the most part w/o loosing the 50hp like the lpe cam did.

 

I'm spinning my 5.3 to 6500 with an LPE cam and headwork. I just need a stall. BAD

 

im using a lunati 212/221 .510. i have a 2800 stall and the truck is pretty steetable. it will be even more so after tunning. it didn't pull hard without the stall though.

 

i like the way my cam is pulling. i have the 2500 stall. 216-220-525-532-114. i put on 1.85 rockers. i figured the lift to be =571.3 and 578.1. not sure how that affects duration. anyone know on the duration????

 

I have a similar cam now, 216/216 525/525 114 it just feels a little too mild for me.....it gave me around 45 horses though after TEA tuned it.

 

thats outstanding. do you happen to have a dyno graph that you could share with us?

denali, its not much on the duration. the rockers are just raising the valves up a tad bit higher so therefor you get a tad more opening of the valves from what i understand.

 

I do, I will have to find my old graph aswell....but I will get those up soon. I know the first graph was 243.?? hp and the new one was around 290 hp......I am running with 28* of timing on that 290.

 

that'd be great. any information on the cam? grind, lobe ramps exc