Okay well since I know precisely nothing about intakes I figured I'd ask you guys. A local guy is selling a performing rpm intake for an sbc for $90 with about 3k miles on it. Now I'm guessing the intake on the LO3 is less than stellar so would this be a good item to pick up or would it just be a $90 headache?

 

Not for 90 bucks. You could buy it and set it aside for a later time. You should be able to find a similar intake for new for only 100 or so. What does that intake retail for new?

 

I've been looking to try to find the new price of one but I don't know the part number so its not working out well. There are a lot of intake manifolds that match that description ranging from like $115-$250. I'm gonna try to get some more info from him...this would be a future project for me I just figured if its a good deal I'd grab it.

::Edit::
I found some info on it, its more for high end power which my car isn't set up for at all...

 

TBI's do very well with single plane manifolds. the manifold on my car is listed as '3500-7500' but because the TBI functions diffrently than a carb, it doesn't have the low end fuel metering problems that carbs do. in fact my throttle response and low RPM power are great.

 

This intake is dual plane, its an edlebrock 7101..says its good for high lift cams so I passed on this one. I want to get headers first anyway.

 

What Dewey is trying to tell you is, since TBI does not follow the usual rules of RPM range of a manifold, the usual manufacture's recommendations do not apply. We can use a 'larger' manifold because we don't have to worry about the vacuum seen by a carb.

I would not be afraid to use that manifold. In fact, I have just put one on with a BB TBI but have not yet tested nor tuned it.

 

Paul, Yes and no.

we do not need the vacume reference, so part of what makes it a high RPM manifold (Large Plenum, Single Planes, ect) do not have the adverse effect on low RPMs, because TBI does not use vacume pulse refrences to fuel.

The port size DOES effect us. you do need a port size that matches those on the head, so you have a smooth transition, you also need to be aware of how runner size effects velocity. The TBI system, will be happy on a large plenum, short runner setup, so long as the port size is not too large for what the engine needs, and the port size on the heads.

HTH
John

 

I don't know anything about the port sizes so I'm lost on this...I'm trying to learn about headers now which is giving me a big enough headache that I can't worry about this intake...

 

If you want headers, just look into the Hooker 2055's they're shorty headers with 1 5/8" primaries going into 3" collectors. Probably some of the best you can get for our cars.

 

I have dual cats so I'd need a custom y pipe to run those...i believe hedman makes some good ones with a dual cat y pipe i just can't figure out which ones

 

Dewey, agreed on vacuum influence.

Also, agreed intake ports do not want to be BIGGER than the head port. Since we're talking about a Performer RPM, the port size is not too big(in my opinion, I guess). Port size on the head has more influence on velocity of the fuel mixture into the cylinder.

Formula4speed, be aware of the height of the Performer RPM. Might be a problem in an F-body. Perhaps someone else can speak for that.

BTW, $90 is about average for a used Edelbrock on E-bay. If you can inspect this one and assure all threads are intack before paying you will be one up on an E-bay manifold.

 

It may be, i need to look at the deminsions.

with a holley adaptor plate, at a 14x3 drop base i am touching the top of the hood with my setup (wieand 7525)

 

Summit racing says it won't fit under a stock vette hood which makes me think it might give me some problems. The guy selling it is in my local fbody club so I could inspect it. I know someone running one in his 2nd gen but he also has a cowl hood. I have a 14x3 open element and hadn't even considered hood clearance.