smokinponcho73

iTrader: (6)

I am building a 9.5:1 408 for my M6 WS6. It has ported LS3 heads ls3 intake and full bolt ons. My long term goals are to put an f1a on the car and keep it full weight. My cam specs are 233/242 duration with .595"/.607" lift. The lobe separation is 114°, intake lobe centerline is 112° and exhaust is 116°. Should I install my cam straight up, add 4° advance like my old cam was or retard it?
Thanks for your time! Brandon

smokinponcho73

iTrader: (6)

Anybody?

Kip Fabre

If that was my cam I would install the intake CL@ 111 EX would be @ 117

KCS

iTrader: (20)

If it's an 112ICL, how would you move it only 1 degree? Most timing sets I've seen are in increments of 2 degrees (besides Cloyes and Jesel). I agree though, I'd certainly advance it as long as the PTV clearance will allow, which those forged pistons should give plenty of room for.

smokinponcho73

iTrader: (6)

I have lots of ptv clearance and my timing set is adjustable in increments of two. So you feel I should run it two degrees advanced? What will the advantages be of this? Won't it lower the power band? I would like that more than raising it.

KCS

iTrader: (20)

The earlier IVC should help boost low RPM power but I'd be worried too much advance and the exhaust valve would open too soon while the cylinder pressure is still doing work on the piston. Often times, a lower compression ratio will result in the cylinder pressure degrading at a slower rate and therefore will like a later IVO.

Kip Fabre

Not to be a smart *** but what the card says and what you get could be very different. You really don't know what the cam is until you degree it yourself. Most of the ones we have checked the lobe separation is off at least 1 or 2 degrees and the advance could be off 1 or 2 degrees. Even our cams with the Cam Doctor report will very in the engine depending on who is checking it. You can never be sure what you have until you check it yourself.

KCS

iTrader: (20)

Believe me, you're preaching to the choir. The picture in my sig was from when I degree'd the cam in my engine. I've probably done the same in a hundred other engines as well.

Kip Fabre

How often do they match the cam card?

LsF-150

iTrader: (2)

A buddy who builds a lot of LS stuff degree's everything he installs but advance's every one 2*. He claims the chain stretches immediately upon initial start up and this compensates for that, he claims to have degree'd several cams he has installed after tear down and found this with single and double chains, doesn't matter. He grew up in his dad's speed shop and the old timers always did it this way with the same results. What do you guys think about this theory?

KCS

iTrader: (20)

Pretty often actually, except the one in my engine. Lift and centerlines were dead nuts but duration was larger by 1 to 3 degrees. Pretty weird, but it was not a new cam.