I was wondering what intake manifold you guys think gives you the best performence for the TBI powerband and about how many tenths of a second you think it will take off my 1/4 mile times , my current mods are in my sig.Thanks

 

i've been looking into this ...

i would stay away from the edelbrock and holley tbi intakes. they have small plenum chambers which really hurt top end performance. i think they'd be fine for a pickup that needs pulling power, but if you hope to make any power past 4500 rpm, you need a carb intake and an adapter.

the next question is single plane vs. dual plane, and frankly, i think you need to resolve your gearing/positraction issues first. an l03, for example, makes great low end torque. if you do a head and cam swap and use a cam that keeps the torque curve toward the low end of the rpm range, you'll end up with serious wheelspin issues. in that case, a single plane intake, which makes less bottom end torque than a dual plane would be the right choice. it depends on the rest of the setup.

for example:

cam ... more duration generally = more upper end hp and less low end torque

headers ... 1 3/4 primaries generally make more upper end hp and less low end torque than 1 5/8 primaries

intake ... single planes generally make more upper end hp and less bottom end torque than dual planes

for a street car, you want lots of low end torque, and your engine will last a lot longer if you dial it in to make max hp below 6,000 rpm, but there's such a thing as too much of a good thing. having monster off-idle torque does nothing but fry the tires.

if you decide on a dual plane, the edelbrock performer carb intake is hard to beat. the rpm and rpm air gap offer more power, but won't fit under our hoods.

there was a thread awhile back about intakes, there's a weiand single plane that got good reviews ... don't remember which it was.

hope this helps.

 

the weiand 7525 was the intake under discussion and it was determined that it works very well and not much if any low end power is lost with it and TBI. Also, there are a few guys on here running performer rpm's and rpm airgaps so you can get them to fit with a little modification I think.

 

i'm almost positive the rpm and rpm air gap won't fit under a stock hood. i think the guys running them have aftermarket hoods. could be wrong, though. anyone running an rpm or rpm air gap under a stock hood?

 

Thanks guys , i really want to run a performer air gap , but I need egr so my car wont run like crap , Does anyone no a way to ditch the egr w/ out messing with the computer. Oh and also I will probably run a 4" cowl anyway so it doesnt matter to me about hood clearance, I appreciate your replies.

 

Almost positive an Air Gap wont fit under the F-Body stock hood i have one for 1969 327ci SS thats in a 74 Nova and it wont fit under that and it has lots more room then my '88 SC

 

For a stock L03 the edelbrock tbi is probably the best choice, but as others have said, with cam or heads you would want something that will breath a little better up high, but you could always port it.

 

I'm positive that Jon Prevost is running a performer RPM on his 350 HO combo, and IIRC z28boy was running an RPM as well. I think they're just using drop base air cleaners and I think modifying the air cleaner base to clear the distributor. Maybe someone will chime in with exactly what has to be done.