Yeah, I had heard and read that the performer is not much more than a stockintake made out of aluminum, and that the RPM is superior for breathing. I was just curious about the difference between the RPM and the Stealth. You answered that question quite well. Thanks bro. It's guys like you who make this classic section one of the best on the internet.

 

I wouldn't give me that much credit. With all the newer manifolds and heads out there, I'd like to see a dyno mule shootout with decent heads/cam where all they change is the intake and see how it affects power across the range.

I also looked it up on the respective sites, the Stealth and RPM are both about the same height, but the RPM has larger runner cross sections, so it'd breathe better up top than the Stealth(but not for the reason I initially thought). I'd like to see how the newAction Plusfares against the RPM and the Stealth.

 

Heck, my Victor Jr. idles better than my Stealth did...and that Victor is a single plane. Go figure.

 

^ we put a "performer" on my buddies 4.3 chevy V6 and it was single plane..... figure that one out?!?!?!

to me, from looking at the intakes i always thought the stealth looked like it was a idle-5500 intake, it just doesnt seem like it would flow as well as the RPM in the mid-top rpm ranges. but it was put VERY well that the new action plus seems to fill a gap between the performer and the performer rpm, and that may be the best way to go for the street. i may eventually snag one for myself and see how it compares to the ported RPM i currently own.

 

I can't complain about mine, it drives really well, and makes power everywhere, and doesn't stop pulling past 6k rpm. Weiand seems to have a different design philosophy on intake manifolds than Edelbrock, though they both make very good manifolds

 

67 i wish i could take a ride in your car, as i am looking at a 570 for my 289 along with that weiand intake (eventually)

 

Well, it went 13.440 @ 105.15 with a 2.159 60'(sorta crappy launch) first run down the track,and that was sucking hot air out from under the hood. I was also shifting a bit early to be on the cautious side, so I bumped my shift light up a bit.I'd like to get everything tuned out right, especially suspension which I tweaked the other day, and I just installed a hood scoop and isolated the air cleaner from the engine compartment, so hopefully high 12's before the end of summer. And it leaves stoplights just fine, drives great everywhere, gets decent mileage. And all with a 3.00 gear. For street performance it's a really nice setup, drives with manners. I can't wait till I can afford a 3.55 gear

As a daily driver it really does run great, and it's reliable

 

Cutting the plenum divider was a trick from the old days (50's/60's) that worked on the dual plane manifolds to extend the range above 6k. If you didn't go too far it didn't hurt your bottom-end enough to notice. I've seen some new units that have a notch cut in the divider and assume it is for the same reason. Just can't remember the model of the manifold. My 1967 Cobra unit is cut and the 427 Chevelle back in 1970 was cut down about 3/4". Never had them on a dyno, but it seems to work based on the old seat-of-the-pants dyno.

 

its the rpm airgaps that employ the divider trick, and the old school offys have a small notch between the back two barrels. i knocked mine down about an inch or so, and knife-edged it.