Hi, I have a 402 BB and I'm trying to decide on which intake manifold to go w/ this Isky Cam:

Dur@.050 221(Int) 232(Exh)
Lift .542(Int) .565(Exh)
114 LSA
2200-6500 rpm range

I also used the Engine Analyzer on the computer and came up w/ 361HP@5500 and 384TQ@4500. I was thinking between a Weiand Stealth or an Edelbrock Performer RPM. Thanks for the help. Eric

I vote for the Stealth, I've used both. At least with the Stealth you can thread your vacuum fitting in the manifold to connect your power brake booster,if so equipped. You can plumb the Edel, but its a bit of an ugly pain!

RPM Air Gap.

Oval port Victor Jr.

Single plane with that cam??? I suppose he doesnt need intake velocity? Use the smaller manifold with that LSA, for sure. Whichever dual plane you own. AirGap will do nothing , imho, over a plain RPM at this level.

rpm intake

I would use the Performer 2-0 complete with plenum divider intact, wouldn't even bother with an RPM on a 396 - 402 motor spinning at less than 6000.

Originally posted by 427L88:
Single plane with that cam??? I suppose he doesnt need intake velocity? Use the smaller manifold with that LSA, for sure. Whichever dual plane you own. AirGap will do nothing , imho, over a plain RPM at this level. The Oval port victor has smaller cross sectional runners. I WAS going to run one, until it was stolen from my garage. I think it would rock on that motor.

I Agree with GRN69 my 402 030 over running a 270H CC magnum Hyd. Runs best with the performer not enough cam to take advantage of the RPM. What Carb are you running? I am running a Q-Jet custome tuned by Sean Murphy. Good luck with your set up!

I'm going to be running a 750 holley 3310 or I can run my orginal Q-jet and get it tuned too. Now I think I'm deciding on the Performer 2-0 or the Stealth, but I hear w/ the stealth I'll loose some bottom end. I wasn't even thinking of a single plane.

What Trans are you using if an auto IMHO I would have you Q-jet Carb tuned by Sean much better response on the street with great bottom end.

I'm running a th350

What heads are you using and what piston/CR? What will your valve train take?

I'd assume you have open chambered oval ports with a CR 9+. If you're running stock rods like as in 325hp ones and cast pistons I would stay below 6000 (like 5500) and run the performer 2-0.

If you're running stronger stuff that breathes better then I'd go with the RPM or Weiand. The Weiand is cheaper.

I have an air gap but only becuase I got a deal on one used very briefly.

If it's all forged strong big stuff and the heads will breathe over 6500 then run a single plane with torque converter. As in at the drag strip. smile.gif

I run a 750 on my 454 but it's a street motor. Even a 600 will work up to 5500.

Save your money for tires, gas, paint, fiddling, girls, taxes, insurance and traffic tickets. smile.gif

The only reason I said Air Gap was so he would'nt have to use a lifter valley tray also, I use the RPM with a valley tray now. If I don't get the 10.99 I'll try the Vic Jr. since builder said he'd buy it back if there is no improvement.

"The only reason I said Air Gap was so he would'nt have to use a lifter valley tray also, I use the RPM with a valley tray now. If I don't get the 10.99 I'll try the Vic Jr. since builder said he'd buy it back if there is no improvement."

I don't race so the air gap just looks pretty on mine. If you're racing then go with what works best.

Ask him if I can have it at reduced price when you go to that single plane. smile.gif

Since I'm only running a bone stock '71 LS3 w/ open chambered heads and 8.5:1CR, I think I'm gonna go w/ the Performer 2-0. Now I'm deciding on carbs to use, 3310 or the Q-jet? Also, I was wondering if they made any closed chambered ovals I could use to bump up my CR? Does anybody know any casting numbers for these type of heads? I still have to take the heads off anyway and open up the spring pockets if I'm gonna use this cam. I might as well see if I can put some better heads on while I'm at it. Also, the car is just going to be my daily driver but will sometimes go to the track at least once a month, Thanks. Eric

TJC, yes, but the open plenum lets each cylinder see alot more air. Way better power, potentially, but not at this level, imho. Unless he undercarbed it, then maybe it would 'feel' as good as a dual plane.

How about the old Edelbrock C-396 intake? There is one on E-bay right now, they are one of the best intakes ever made for a oval port Big Block Chevy engine. I have one on my 396 + 30 in my 67 RS/SS 396 Camaro with a 750 Holley Double Pumper Carb & a Comp Cams 268 Extreme Engery Cam. My combo does real good.

I'll check it out, thanks

Originally posted by gnunzio:
I Agree with GRN69 my 402 030 over running a 270H CC magnum Hyd. Runs best with the performer not enough cam to take advantage of the RPM. What Carb are you running? I am running a Q-Jet custome tuned by Sean Murphy. Good luck with your set up! Not to be nosy, but what would Sean charge if the throttle shafts were good.

What's the difference between the C396 and the Perfomer 2-0, they look exactly the same design to me. Now I'm down to deciding over the two, the old or new school Performer?