Re: Advancing cam timing and power..
Mustangs right you will chnage the character of the cam but not really change the peak output much.
I have run my DEV3HL with 0.025'", 0.035" & 0.045" lift at the cam ATDC (not at the valve) and the peak power is all much the same. At 0.025" the idle is poor, the low end very doughy and the cam kicks in strongly at the BBM switchover 3800rpm peaks at 5300rpm and holds stronly to the limiter. At 0.045" the idle is good the low end good, the mid range strong with a linear build of power peaking at 5300rpm and slowly trailing off to the limiter. Best all round for me was 0.035". I have tried this a lot but its all seat of pants as I don't have a dyno to check it with. At 0.035" I am running a 15.6 sec 400 ET so its not bad for an Auto wagon.
Just to compare in case your interested because of my AU rocker ratio of 1.8:1 0.025" lift at the cam is 0.045" lift at the valve.
AUII Auto wagon 4.0L InTech Pacemaker PH4480 extractors, 2.5" exhaust, JMM DEV3HL Cam Unichip 144rwkw. 1/4 mile email@example.com