ok i received from a good friend of mine a 292 comp cam set retainers springs timing set ect.. now my question is on a stock 350 what would i need to do to run this set up? considering the motor will be rebuilt?

 

That is a monster cam. In stock form you would be 10fold slower then you are now. If you do plan on running that cam, a head swap would be mandatory as well at a stall, better rear gears,..etc.

 

Think ; lots more compression needed

 

Dont, that cam is a horrible turd on a street 350 much better choices out there.

 

I run a TPIS ZZX cam(290@ .006, 240@ .050), .560 lift on the street with TFS G2 heads and full length large tube runners. My engine romps from 2,500 to well past 6K (6,900 rev limit). This car is scary fast and a blast to drive. I run 10.2:1 compression, and a 2,300 stall converter in my built 700R4.

You will need to have the heads, intake and headers to support this cam. And remember, big cams with carbs are harder to tune for drivability than big cams with FI.

 

well the cam kit was free so im not just gonna turn it down my rs already has headers and 4:11's and this would be a slow build not an over night throw together fi is really easier to tune? what about tbi? i know how much tbi sucks so im pretty convinced thats not an option

 

Let me rephrase that. FI is more tunable, not necessarily easier. TBI is more tunable than carb but less tunable than port injection. The problem with tuning for a large cam is compensating for overlap and the resultant reversionary intake pulses it creates. Not only do we lose vacuum signal, which makes off idle tuning difficult with a carb but the reversion(backward) pulses cause the fuel and air mixture to stall and seperate in the runners. This is in addition to the lack of efficient cylinder filling at low RPMs. These combined make it difficult to create sufficient low end torque for good drivability.

With port injection we eliminate the problem of fuel air seperation as we inject the fuel directly onto the intake valve. This leaves us with just the cylinder filling issue which we can tune around to a certain degree. Staying with a wide LSA helps(112 degrees is good). The wide lobe seperation angle reduces overlap and reversion.

I have seen some fairly wild combinations. Everyone of them was streetable enough that the owners were okay with it. Some dont mind the quirkyness off idle as long as they can smoke the tires in all gears and tear it up at the dragstrip. The nasty idle is music to some people's ears. As far as tuning goes, it can be done. Even with a carb. Its just a question of your skill level and the balance of how much time you want to spend to how well you need it to run.

The absolute necessity for a big cam is big valves, large ports and runners, stiff valve springs and a bottom end and valve train that support high revs. This is be cause the big lobes will make power at high rpm. Figure a 6,500 rev limit minimum.

 

Why build a motor around a cam though?

On a stock shortblock theres really not much you can do to "make it run" as far as a Magnum cam that size. Not trying to discourage you just hoping you dont get disappointed when its not all you thought it would be or didnt run as tough as it sounded.

 

Just checked Comp Cams website. That's a flat tappet. Much less forgiving than a Hyd Roller.

 

yeah it is a flat now i understand this is a wild concept to build around a cam, im not trying to make a ton of hp or stomp anything that pulls up next to me i was just curious to know what it would take for a build since i have it i might as well use it. definitely appreciate the responses guys.

 

That cam will want some compression 11:1, a good cylinder head plenty of gear etc.

Give you an example. back in the 80s/90s a popular combo was an 11:1 350 ported 202 camel humps Vic Jr and a 750 DP carb.
390-400 chp was about all it would get.

So lets say for the heck of it you made 300 rwhp. Take a well built TPI or a more conservative build that made 300rwhp, it would make a ton of torque in comparison and whip the pants off the first combo all day.

Big cams sound great and have their place but nowadyays lopey stuff is overrated to an extent.

 

My view: It's a bad cam choice - too much duration for your engine. It puts you in a position of having to make all sorts of engine modifications JUST to get the engine to run in an acceptable manner. We're referring to thousands of dollars here.

But it ALL BOILS DOWN TO the cam not being well suited for your application. Even if it was a gift my advice is for you to take a pass on it.

Jake

Jake

 

ok with that being said what to you think would be worth a trade saying it was to someone that wanted the cam?

 

The cam sells new for less than $140. Doesnt make it worth alot. If its been broken in already its worth alot less. Unless a flat tappet cam is kept with the original lifters it was broken in with, each one matched to its original lobe. Its almost sure to flatten lobes. Especially a cam that agressive. IMHO, flat tappet cams, except in class racing where they are required, are almost useless. A hyd roller produces much more power/drivability. The additional cost of the roller cam and lifters is so worth it.

That said, you may find someone who wants that cam. Just ask around.

 

well actually i do have the full kit and the lifters are matched with the lobes by everything is in their original boxes. so i guess im going to try and sell it or trade it for something thanks fella's

 

If you got the whole kit then i would use it.......throw it in a rebuilt stock short block an get some decent heads, single plan intake and a Holley 750 dp mechanical secondary crab. Find the stuff on craigslist or something to keep cost down. That's what i did. It will put a smile on your face i guarantee it with 10-1 compression an at least a 3000 stall and 3.73 or steeper. I got this same setup i just described except with 4.10s I run a Th350 trans also. This engine has no hesitation it revs rite to 6500 with street tire of course......

 

I have the 292 magnum in my 350 I just got the car running today so far so good but everyone is telling the truth you have to swap more than the cam u have a lot to do just to support the cam. Only reason I went with it is cause I bought the heads/cam/lifters and pushrods as a package off my buddies running motor for a good price but it still ended up costing a pretty penny to support the set up.