Mark Johnson

iTrader: (1)

Like the title points to, overlap. Just when I thought I had it all figured out in simply thought keeping away from too much overlap because that acts like a vacuum leak and trashed your low end and what looks like just a little more overlap is actually the square of the degrees more. But the real stick in the mud for me is that tat a certain point one cylinder on the intake stroke actually takes from another cylinder as the 90* firing order of the V8 make this inevitable. So the question is, guys- how much is too much?
The plan is to go LQ4 cam only for a DD with added zing...........

Dangrebel

iTrader: (1)

the larger cubes dont mind overlap as much as a 4.8/5.3. How much overlap is the cam you are looking at? I daily drive with 28 degrees of overlap in a 408. sure its not the best daily cam, but i dont mind.

Atomic

iTrader: (42)

For a DD, shoot for -2 to +2 overlap at the most. Stock cam has something like -6 degrees of overlap or something stupid. Measured at 0.050".

Mark Johnson

iTrader: (1)

2 grinds I'm cookin' up have me with 27* and 30.5* overlap measured at .006"

madmann26

iTrader: (7)

The 1st cam I had, had -10 or -11 overlap. It was a torque monster down low.

The cam I currently have has like +5 I think, it's still torquey but pulls much better up top.

Dangrebel

iTrader: (1)

Op, How big of stall are you going to run?

Atomic

iTrader: (42)

My numbers above are at 0.050"

Mark Johnson

iTrader: (1)

Hmm- guess I oughtta look at the .050 measurements; I'm at -11.5 and -13*. But again, this stealing from another cylinder and contaminating the mixture still has me loosing sleep. SO is it the .050 numbers that I should really focus on? Oh yeah- I'm fixing to go with a TB converter........

Atomic

iTrader: (42)

You're joking, right?

You have a very, very, basic build with a damn near stock set of requirements for DD use on a stock size engine. Any of the small, common cams will work just fine.

Dangrebel

iTrader: (1)

Dont sweat that, the intake runners are long enough that you wouldnt see that happen unless you had an undriveable amount of overlap. Like i said, i daily 28 degrees of overlap @.050. i dont notice it with my stall.