Good Lord a 292 thats Advertised duration, not the @.050. If its the advertised then thats not all that bad, but I would at all the cam specs. 292 doesn't tell us a whole lot. But if the lobe Seperation and c/l are around 112/108 with around a 480/490 lift you should have a great cam that will give a good idle.

My only concern with a C3 is with the vacuum system that controls wiper door, headlights and other things. If you drop the manifold vacuum too much then you might have slow/weak operation of these systems.

Also if its a roller cam the ramps on the lobes can be much more agressive compared to a hyd flat tappet witht the same specs, which means a less agressive roller can make just as much power as a larger HYD. ft.

I agree, that's a lot of duration for a street car. Most people wonder if they should go as high as 284 degrees. While it might sound cool at stoplights, unless the rest of the package is designed to take advantage of the high rpm breathing (and the regular performer manifold is NOT), you are going to be disappointed with the narrow power band.

Tell us more about the rest of the motor, tranny, rear gears?

Joe

|UPDATED|6/26/2003 8:04:12 AM|/UPDATED|

Thanx for the input. As far as the rest of the "package", I only know that the rear was rebuilt at the same time the 6 Ujoints were replaced. Other than that, I haven't "rolled" the car to determine the rear ratio. The Gm crate motor part # is 10067353 which from what I read produces 249hp from the factury plus whatever mainfold/carb setup ya have. The trans is the original (rebuilt) T-10. Not sure of any upgrades there. Here's the nitty-gritty,, I'm not really concerned about "original" at this point, the P/o took that away from me. What I'd like is a clean,, "stock appearing", NOT "stock sounding", car/driver that'll, shall I say,,, urinate on the ricers. Lord knows, they're all over the place in this beach town during the summer. I'll leave it at that for now, thanx a bunch for your input guys/gals, it's definitely appreciated.

Thanx, Bill

That is the basic Goodwrench motor, and it only has 8.5:1 compression.
http://sdpc2000.com/cart.asp?action=prod_detail&catid=128&pid=110
With a cam as big as 292 degrees it will be really soggy on the low end and never really develop a lot of power. You should be looking at cams in the 262-270 range, maybe as high as 278, if you want a lopey cam and the rear end is steeper than stock.
You might be interested in reading the Chevy High Performance series on building power with that motor. http://www.chevyhiperformance.com/techarticles/46320/index.html
Joe

Don't bother trying to beat the ricers, you're much too heavy. I know several of these guys and they are spanking all but the best C5 drivers. In fact I just read about one of the newest Super-roo's (pronounced "piece of s@#$%) that is now generating 300hp and 300 ft/lbs of torque with all wheel drive and a fraction of a C3's weight.

Its kind of like selling your soul for acceleration.

"Some things just aren't right."

only thing about ricers is that their power dosen't come on till 3500 rpm. i have suprised many rice racers off the line with my stock 360 ft lb of torque. i just jump off the line while their rice is still trying to wind up . the only way thy would have a chance would be to dump the clutch at about 4000-4500 rpm while i just give it a little torque at the line. most rice owners don't drive like that on the street. i plan on replacing my # engine with a mild 383 set up for lots of low end torque. it'll will pull high vacuum which means better mileage too.

I have a 270H Magnum Comp Cam and I am very happy with it's preformance, however something you may want to consider: in the specs or footnotes it states " low vacuum ". As you are aware of all the vacuum requirements in the car, be careful. I have a little problem with my brakes and I'm not a mechanic or do I profess to be an expert, but it may be due to this!
Gerry If anyone who reads this could verify that for me I would appreciate it!

Hi Garry,

Your assessment of the ricers torque is true but the ricers up here are running drag racing brake set ups so that they can hold 3500 rpm at the line and then let'em rip. I live near a highway that has been famous for drag racing for about 35 years and we see some severely fast cars. The F-bodys are truly amazing and are running low 10's. Even with a quick C3, I don't even try.

Sorry for using this thread as a personal forum.

i agree , i live 9 miles from a drag strip and have seen an rx-7 running 10's but they sit at the light with the engine at 8000rpm and then dump the clutch. no street car would be able to hold up long under such abuse.