I have an '83 2wd 720 with 5 speed manual trans, and I'm already running Pacesetter headers, a Weber 32/36 DGEV carb, Magnaflow high flow CatCon and Magnaflow SS muffler, and all that has worked out very well, but the midrange power still seems like it could use some improvement. So I'm thinking of adding a high performance cam to the motor. In doing research on line for Z24 cams, apparently the only thing available these days are a couple of Comp Cams grinds. They offer two grinds, the 252S and the 260S. The 252S looks like it's an RV type cam with most of the power curve on the bottom end, but the 260S looks like it's probably about what I'm looking for. The 260S cam has 214 degrees duration @ 0.050", and .420" lift, with 110 degrees lobe separation angle.
My question is: Have any of you guys out there put a Comp Cams 260S in your 720, and if so, how do you like it? And if you used a different performance cam, what brand and what specs for duration and lift was the cam you used?
a 2wd 5 speed with a weber will respond best with the Comp 260 cam. the 260 peaks out around 4500rpm on a stock engine which is perfect because a stock z24 wont offer you much past that anyway.
Keep in mind a GOOD tuneup is key before and after adding a cam.
I turn 35" tires with only 4.36 gears. the 260 works well but 3rd gear is mandatory for hills and brisk acceleration.
Here is the PN#
I live in Idaho, and since the 720 is over 30 years old, I have it registered as a Classic, so there is no smog test. And even before I re-registered it, it was passing smog with no problem.
Thanks for the responses, guys. What you said is about what I thought about how the cam would perform. I ordered one of the Comp Cams 260S cams this afternoon, so I should have it by the end of the week. Once I get it in the motor, I'll post a review here. I also did a search on just about all of the major cam builders websites, and Comp Cams is the only one who makes a performance cam for the NAPS-Z engine.
Update: I ordered the cam from Summit Racing at the first of August, and it showed up a few days later. I found a shop that specializes in import engines, but when I went over and talked to them, they really didn't give me the feeling that they really knew their way around the NAPS-Z engines. So the cam is still in be box and I'm still looking for a shop that is good with 720 2.4L engines. A cam change shouldn't be that big a job, unless the cam chain tensioner pops out, but if a shop doesn't know about that, it turns a sort of simple job into a major undertaking.
So does anybody know a shop or mechanic in the Boise, ID area that's good with 720 motors? Even a shop within 100 miles would be OK.
Well, it's taken a couple of years, but I finally got the cam installed last week. The first time I drove the truck, I was kind of disappointed. Performance didn't really seem all that much different from the stock cam. But I remembered chatting with the guy in Vegas who runs High Impact Motorsports, and he said that would happen unless I advanced the timing a few degrees. So I did that, and it really woke the cam up. The truck is much more drivable now, and I'm tempted to advance the timing a couple degrees more and see what happens. By the way, anybody around Boise, the place I had the work done is Dr. Floyd's Garage over in Garden City. The guy is really good, and definitely knows what he's doing.