does it pull and make power past 6 grand?

 

I think I know what you're asking. Hopefully this will help some of the newer "modders" who are looking for some answers. It's not a question that can be answered without having more info. Do you mean, "Can the Stealth Ram support a horsepower peak above 6000 rpm?" If so, my answer is...I think so. I haven't seen any dyno results from anyone who's using good heads and a big enough cam to say for sure, but we know that it won't be choked as bad as factory TPI or even the SuperRam at 6000+ rpms.

If you bolt a stealth ram on an otherwise stock TPI motor, the answer is HELL NO! It won't fall flat on it's face after 4500 like the TPI, but it will still make less and less power as you go above 5500 rpms. (even though it dynoed 63 more hp at 5200 than a stock TPI 350 motor)

That doesn't mean the Stealth can't flow up there. It happens because the factory heads and cam are not capable of peaking up there. I don't know exactly what the highest rpm the factory heads and cam are capable of peaking at, but I guarantee you that it's below 6000.

Don't get me wrong here. The "rolloff" of power above 5000 rpm's will be much less dramatic with the Steatlh Ram than with the factory TPI on ANY motor. My point is that it's your whole combo that determines your power curve.

Example:

My big 224/230 duration cam @.050 with .503/.510 lift will make peak horsepower at about 6000 rpm's with some great heads and the Stealth Ram in a 350. In a 383, it would be at about 5600 rpms.

So will it "keep pulling and make power" above 6000 rpms? Well that depends on what your definition of "keep pulling and making power" is. Power will start dropping more and more as I rev it above its peak. Optimum shift point may be around 6200-6500 to put the engine back higher in its powerband after I shift into the next gear.

Now if I had a huge solid roller cam with like 250 degrees duration and .600+ lift, that thing would want to peak above 6000 rpm in a 350 for sure. Would the Stealth Ram allow this high peak to occur? I don't know dude. I don't think any of us know exactly what its limitations are yet.

All I know is that its a hell of a lot better than any of our alternatives for a bad *** intake manifold for the price. And that's why Holley made it. Happy revving!

 

Wonderful reply, this is going into the FAQ

 

thanks for the input, i was in no means meaning will it make a stock cam/heads car pull past 6000rpm. i shoudlve said if your car is capable of doing so, will it pull past 6000rpm. im getting a custom grind cam like the CC306 but with a little more duration. and i know the 306 pulls past 6200, i rode in a car that pulled past 6000 easy, with the guy letting off not wanting to over rev. ive got a block and i was wondering if i build a motor that could do it, would this manifold be good past 6 grand if i wanted to run that high at the track or something.

 

or i shouldve just put what you said and what is its limitations.

 

I'd say its design would allow it to pull well past 6 grand with supporting components. Its a shorter runner than a SR (from what I've seen) and SR's can pull well to 6500 with the right setup. I wouldn't expect peak rpm's like a Miniram/LT1 setup though.
I would answer your question with a yes.