My Cam

[webbered six]

After some clarification. I have a "C" stamped camshaft, which is supposedly a Nismo cam which makes sense as the motor came from Nismo as a crate motor. Apparently the lift is 434/256 duration but it's mentioned as being a high performance cam. Listening to it you wouldn't think hp. People speak of 274 duration cams, is this going to be more of a performance cam than I have presently.Ricky

[webbered six]

Forgot to ask, can someone suggest a meatier street cam, and will changing cam give more punch. I'm running 3 x 45 webers, L28, flat tops, and 3.0ltr bore

[dazzed]

Is the letter c the only markings on the cam? if so its a standard 260z cam , could also be a reground cam but there should be other markings ussually on the cam gear boss

[pauly_adams]

getting into the cam discussion i have both a camshaft with a A stamped on the back also the one from my 260 has B4 stamped on it i was told the B grind was the better of the cams does anyone know the difference between the factory grinds.

 

cheers Pauly

[webbered six]

Dazzed, I'll find out for sure soon as I've ordered a Billet 72 degree.

[Zedman240®]

The cams with the "A" stamped I'm sure are the early 240Z camshafts that are pre-pollution so a bit "lumpier" than a 260 cam that was profiled for emissions.

[dat2kman]

only proper way to do it is to do a dummy engine assy, with No1 piston in on the crank only, snig head to block set up cam chain and dial it up, using dial indicator and a degree wheel on the crank nose, better to take readings on either side of tdc, more accurate.

You will then be able to graph out a curve this will give duration/overlap/lift, while at it, then try a different camsprocket hole, and see what this will do for your cam to crank timing ( retard only with the stock three holes)

 

I'm sure it will have been well covered here somewhere.