Well stated Dave. I agree completely. Don > Rodney, > > No, don't worry too much. For all the talk on this thread about lift > numbers and streetability, duration numbers are really more important in > keeping a motor well-mannered for the street. Roller cams allow much more > aggressive lobe profiles that will allow a higher amount of lift to be > achieved for a given duration when compared against a flat-tappet cam. > (because it allows a steeper ramp for the roller lifter) I'll bet if you > look at the duration specs on your cam, it's under 230 degrees @ .050". You > also have much more modern heads which probably flow better than Brian's > vintage heads. These two differences mean a lot. > > I'm sure most of us would run roller cams in our old motors if it didnt cost > so much ~ $800 for the cam and lifters that retrofit into the older blocks. > I know I would. They are superior in pretty much every respect. > > -Dave > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:owner-chevelle-list@;chevelles.net]On Behalf Of Rodney. > Sent: Wednesday, October 23, 2002 5:50 PM > To: [EMAIL PROTECTED] > Subject: Re: [Chevelle-List] SBC Cam selection > > > You guys are scaring me... I just bought a crate engine with a hydrolic > roller with a .525 lift (the ZZ4 HOT cam) and L-98 aluminum vette heads... > It's being shipped as we speak. Did I overdue it for a street car? BTW > it's 375 horse and 417 ft./lb torque. > > > Rodney. > 71 Chevelle > El Mirage, AZ > > > > > ----- Original Message ----- > From: "Brian Zack" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Wednesday, October 23, 2002 9:15 AM > Subject: RE: [Chevelle-List] SBC Cam selection > > > > Is a .467 lift too large for the street? Thanks for the replies. I dont > > want to go too big. I know if I had considered going up to say .480 I > would > > probably kill my driveability and low end torque and be over camming it. I > > guess I'll call Comp. cams and/or Crane cams and talk with them to answer > > any more recommendations or things to beware of. Tom, Did you get the cam > > specs on your Cutlass? > > > > Brian Zack > > '70 Chevelle Malibu > > mailto:brianz@;dpsabq.com > > > > > > > > -----Original Message----- > > From: Don [mailto:doverpeck@;cinci.rr.com] > > Sent: Wednesday, October 23, 2002 10:04 AM > > To: [EMAIL PROTECTED] > > Subject: Re: [Chevelle-List] SBC Cam selection > > > > > > > > Just be careful Brian. The number 1 mistake street engine builders make is > > to over-cam & over-carburate. > > Don > > > > > > > I am considering doing the cam change because ever since I built the > > engine > > > about a year ago, the new crane cam and lifters will clatter and tap > every > > > so often and I'm not sure if this could be damaging the cam lobes too or > > > not. I have tried re-adjusting the valves 2 or 3 times and it seems to > go > > > away for a little bit then comes back. I have tried different amount of > > > turns starting at 1/2 turn after clattering stops and am now between 3/4 > > to > > > 1 turn. I have also tries marvel mystery oil to see if that would help a > > > sticking lifter. No help. Being a daily driver, I can only alow a > weekend > > > down time and dont want to just buy lifters and then get into it and > find > > > out the cam is going bad too and not be able to get another one right > > away. > > > I know eventually, a bigger stall converter (and tranny cooler at the > same > > > time) will help my seat of the pants feel. I did a mild polishing of the > > > ports on the redone heads when I built it. I also want to eventually > > change > > > to 2 1/2" exhaust and maybe 3:23(?) or 3:50(?) gears. You know that with > > the > > > horsepower bug, you always want just a little more and still keep it > > > streetable. ; ). Any other comments would be appreciated. > > > Thanks > > > > > > Brian Zack > > > '70 Chevelle Malibu > > > mailto:brianz@;dpsabq.com > > > > > > > > > -----Original Message----- > > > From: Dave Studly [mailto:chevelle@;studly.net] > > > Sent: Tuesday, October 22, 2002 9:00 PM > > > To: [EMAIL PROTECTED] > > > Subject: RE: [Chevelle-List] SBC Cam selection > > > > > > > > > Brian, > > > > > > I'm no expert, but it almost sounds like you're splitting hairs. You > > > mention the car being a daily driver, so I'm gonna assume you're not > drag > > > racing it much. Adding .015-inch of lift is going to be difficult to > feel > > > in the seat of your pants. Have you thought about switching to 1.6 > > rockers > > > instead? If you have .440 lift now with stock (1.5) rockers, swapping > to > > > 1.6 rockers will take you up to .469 lift ( (.440 / 1.5) * 1.6). This > > also > > > adds a few degrees of duration. A *much* easier swap than a cam. > > > > > > I dont think you'll really want a cam with more than .470 lift and ~225 > > > degrees duration (@ .050") with a stock converter. You should be able > to > > > get away with stock valve springs in all of these cases. Don't quote me > > on > > > that last part, though. > > > > > > You have a pretty well-matched combo for low-mid torque. Carb tuning > > (using > > > a dragstrip or dyno to verify your results) can make a noticeable > > difference > > > in power and mileage if you haven't done so. It's not glorious like a > new > > > cam, but it can be just as rewarding in the end. > > > > > > As an aside, I was just at the dragstrip this past sunday and a friend > was > > > there with his 90's LT-1 Roadmaster station wagon. He upgraded the > > exhaust > > > which killed the good low-end torque he had (motor is stock, except for > > > slightly modded air box). To remedy that, he changed the torque > converter > > > to one from a S-10 application (he estimated 2000-2100 stall, versus > > > 1200-1300 stock -- no tach to truly verify these numbers.) and picked up > > .8 > > > seconds in his quarter mile time and +5 MPH (it was also only in the > high > > > 40s, low 50s temperature-wise). If you're not familiar with quarter > mile > > > times, that's a *big* improvement. Getting the engine up into it's > torque > > > band quicker makes all the difference in the world. > > > > > > As another personal aside, I ran my quickest and fastest on Sunday with > my > > > 406-powered '70 -- 12.70 @ 107. I was pretty happy about that. If > > there's > > > one good thing about Ohio, it's low ETs in October! :-) > > > > > > Torque rules! > > > > > > -Dave > > > > > > > > > > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:owner-chevelle-list@;chevelles.net]On Behalf Of Brian Zack > > > Sent: Tuesday, October 22, 2002 2:28 PM > > > To: Chevelle List (E-mail) > > > Subject: [Chevelle-List] SBC Cam selection > > > > > > > > > What is the largest cam any of you are running in a daily driver with a > > > small block 350. I have a '70 Chevelle Malibu with a 350 4-bolt main, > > > cast pistons, 9:1 compression stock heads, edlebrock performer manifold > > > edlebrock 600 cfm carb, 1 5/8" headers, and dual 2" exhaust. It also has > > the > > > stock stall converter and I think either 2:73 ot 3:07 gears ( I have to > > > verify that) Right now I have a crane energizer 266H which is 266 > duration > > > and .440 lift. I am going to be changing to a larger cam and was > wondering > > > what max. size anyone might recommend. I was thinking of of the crane > > > energizer w/ .467 lift or the crane energizer with .454 lift. But, I > dont > > > think the smaller one would give me that much of a difference. I think I > > > would have to change my springs though and probably the converter. Has > > > anyone used a larger cam and not upped the converter? I would assume it > > > would probably hurt mileage and not have that great of low speed torque. > > Any > > > recommendations? > > > > > > Brian Zack > > > '70 Chevelle Malibu > > > mailto:brianz@;dpsabq.com > > > > > > > > > > > > > > > ----------------------------------------------------- > > > To Unsubscribe please visit www.chevelles.net/list.html > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > > > > ----------------------------------------------------- > > > To Unsubscribe please visit www.chevelles.net/list.html > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > ----------------------------------------------------- > > > To Unsubscribe please visit www.chevelles.net/list.html > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > ----------------------------------------------------- > > To Unsubscribe please visit www.chevelles.net/list.html > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > ----------------------------------------------------- > > To Unsubscribe please visit www.chevelles.net/list.html > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED] > > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED]
----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
