I am looking at 4 different sets of runners for my 1992 Firebird L98. My questions are these.

1) Will these all fit on my stock plenum? Plug and play? If not what else needs to be done?

2) Are these runners good for all years TPI? The ads say 85-88 another 89-92 & 85-88 I thought they were interchangeable

3) Edelbrock High flow, SLP high flow, ECCEL High flow, ACCEL High flow What ones would be best. They are all within $200 of each other.

4) I also found a Edelbrock High flow Intake manifold is it worth picking up and will it work with any of the runners?

Thank you for the advice and if these questions are already asked please direct me to the threads.

 

THe 85-88 will work on 89-92 plenum.
get a cold start delete block off kit and rtv or drill and tap npt plug the air tube on the top of the runner drivers side.

 

Thank you! What about the Edelbrock High flow intake manifold? Do you have a preference for what runners to buy?

 

Anything will work from stock to , superram, Accel, tpis, Edelbrock ect..

 

All of those runners will work with the stock lower manifold, or the Edelbrock. The stock upper plenum should be port matched to the new larger diameter runners and if you keep the stock lower manifold, port matching that to the new runners is a good idea also.

Doing just the runners is OK and will help flow a bit, but the stock lower intake is also pretty restrictive. Upgrading the runners and lower intake as a package will be a better result. In all cases, you are dealing with mixing aftermarket parts together. They will work, but likely will require test fitting, clearancing/grinding and other minor modifications to make them work together. It's par for the course with aftermarket parts.

With all that, unless you are getting these parts at a very low cost, I would suggest looking into the FIRST TPI system. It comes as a complete kit and flows much more than all of those aftermarket TPI parts.

 

Have you used the First TPI system or know of anyone that has? I looked and could not find any info on them here in the forum. Looks like a nice setup and is pretty cost effective when considering what the used parts cost.

 

I daily drive a FIRST manifold. It's excellent and their customer service is top notch. Absolutely a much better and more cost effective solution than messing with a bunch of antique parts that require modification and still won't match the FIRST level of performance. The FIRST is 30% larger in every dimension.

There are quite a few members on this forum with FIRST manifolds.

And yes it fits under the Firebird hood.

GD

 

I have not used the FIRST setup yet, but as GD has also replied that he has and also many others on this forum.

I have a set of Accel runners and an SDPC Vortec lower manifold with lots of port work on the upper plenum, runners and lower manifold. I’ve had the runners for 20 years, and I purchased the Vortec base a few years ago. If I was starting from scratch today though, I would do the FIRST setup.

 

Below is a link to my thread where I did what you are looking at doing. It is kinda long thread as I list the tools and each part I had to port. I listed the parts and gaskets also. It came out great and a year or better later my car still runs fantastic. It runs like a new car after I did the intake.

My TPI Breathe Build - Third Generation F-Body Message Boards

Either way you go, First or modify your stock stuff or mix and match you will need a computer tune. With the First system you will need a new computer system (EBL or similar) to fully get the most out of the First system. As GD said the performance benefit from the First system will be better. Both will give you a real seat of the pants performance and a much better running engine.

 

It's entirely possible to use the stock computer with the FIRST and going through the painful process of chip tuning. It's designed to function with all the stock sensors and injectors, etc. You don't have to entirely replace the computer. But I would suggest it for ease of tuning.

GD

 

Here's a link with a lot of information on the FIRST.
https://www.thirdgen.org/forums/tpi/...jection-2.html

 

Get FIRST, it's awesome.

 

I have been speaking with Ken and will be getting a full set up from First TPI. He has been awesome!