Well, tomorrow I'm finally ordering my new Holley Street Avenger carb and a Weiand Intake manifold. Im planning on getting the Action +Plus intake from them, but can someone tell me the diffrence between Idle-5500 RPM range and the one that says Idle-6000 RPM range....how do I know which one I should get?

Thanks

 

Does no-one have an answer to this.......

 

Sorry Dan, I guess that is such a finite question that nobody has experienced that exact thing. 6K RPM would be the very top of the revs you could get from that 289 without blowing it up, so I would think that the lower one would be more appropriate for your engine and set-up, but as a disclaimer, I really don't know. Why are you getting that Weiand and not the Weiand Stealth dual plane?

 

See that 'mild cam' entry in your signature? That's the deciding factor. If it said 'wild cam' and the rest of your engine was breathing real good, the 6k would be you choice. And a 289 Hi-Po will easily top 7K.
Jim

 

Yes, but he doesn't have a HiPo and he doesn't have a wild cam, therefore my reasoning on the less than 6K Jim.

 

Horrnblower,
I think I was in line with your recomendations, just pointing out some info Dan66Stang has at his disposal.
Jim

 

Well I'm getting the Action+Plus due to the advice I got on here a few weeks ago? Is the stealth better?

 

Dan, I don't know, but all the guys here seem to suggest the Stealth. I don't know why. Maybe we can get an experienced member to respond, or you can do some more research. At least you have at least two Weiands you need to research, and some responses to your inquiry.

 

Well a WOT rev on my car surpasses 5500 RPM's...and almost touches 6000. Yes, and if anyone has some advice about the stealth please share it.

Thanks

 

Ok, here's the deal, since I'm using the new Action Plus(8124). First off, the Stealth is comprable to the Performer RPM, I'd stay away from it unless you have a cam that really makes best power PAST 6,000rpm(and I don't mean at 6,000 but PAST), you match a larger cam with a larger manifold and larger gear. In all reality, if you use the Stealth/RPM with a mild/moderate cam you'll make a bit more peak hp at a slightly higher rpm, but will most likely lose some peak torque and midrange power without a matching cam, so the trade-off is similarAVERAGE power at the top end(more peak, less at the lower end of the upper rpm range but about the same average power, and thus performance) and won't benoticably faster on the street/track(except bench racing) and will lose some mileage and drivability. That's not to say the RPM/Stealth series are bad for the street, just that it's for a more wild street cam/head combo, and is best used on something that makes peak hp at around 6,500(which most people do not). Secondly, the idle-5,500 thing....both the Edelbrock Performer(not the RPM) and the Action Plus from Weiand will make good power up to 6,000rpm, but because of the manifold design they make their best power at around 5,500rpm(peak will vary with cam/heads/exhaust/carb). Typically with that kind of manifold you'd see power peak(depending on build) at around 5,500 or even a bit higher with good heads/cam and will slowly start to taper off as it approaches 6,000rpm, after 6 the power will drop off more rapidly, what this results in is less peak power, but a flatter top end power curve, which is preferable for the street, especially since this type of manifold will have more street manners and get better mileage and throttle response. And let's be realistic, the vast VAST majority of us do NOT have true street/strip cars, and 98% or more of the driving we do is on the street at lower rpm/midrange and part throttle. Unless you go to the track literally every week or several times a week as much as you can year round, you have a street car, so get a street manifold. And 3rd, as far as the 2 different Action Plus manifolds, they made this part confusing. The old Action Plus is listed as idle-6,000(which in reality they both are) and the new Action Plus(8124) is listed as idle-5,500. This is basically a "backwards" way of listing it. The new Action Plus(8124) is a better flowing manifold, so it will make more power everywhere(except maybe very low rpm, under 1,500), especially approaching 6,000rpm, when compared to the older manifold. The new one is basicallybetter(think of it as an improved version of the older manifold). The old manifold will work about the same as the new one on a basically stock engine, but if you start adding heads/cam/exhaust etc the newer manifold will work better with a better breathing engine, and will make you more power. If you plan on doing anything to the engine, or if you already have, get the new one. And as far as how it runs, it suffers not for top end. On my 302 the engine keeps pulling harder as it approaches and passes throughpeak powerat about 5,700+ rpm and if I'm not ready for the shift light in 1st or 2nd gear it will get past 6,000rpm VERY quickly. The first time I took it up past 5,000rpm I was ready for the shift light(or so I thought) and before I knew it, the engine was at 6,400rpm and still pulling like a beast(my tach has a recall option to show me last highest rpm, I was stunned at how fast it revved, and had to use the recall to see what the rpm was). I haven't encountered any flat spotting or power drop off I could feel even approaching 6,500rpm. I wouldn't be suprised if something mechanical failed in the engine before the manifold fell flat. It just seems to breathe well everywhere. As far as I'm concerned it's a VERY good street manifold, there may be better, but you can't go wrong with it(or at least that's what I've found). It also drives very well at low rpm, has no problem leaving a stop at hardly any part throttle(with a 3.00 gear too), has good response, is torquey everywhere, andgets good milage.