Do a google search for LSX intake manifold and you will find plenty. Edelbrock and couple of other manifold companies you heard of makes them, plus a few other racing manifold companies may special ones.

Steve

 

Why does it state you can 'still use your distributer' (comes with or without hole) and also states 'going from carb to TPI' ??

What LTx engine was a carb or had a distributer in the IM?

These guys have no idea what they're building. Sounds like they built it for L98.

 

It was originally built for gen1 SBC motors (not just L98s). The intake has been around for something like 30yrs. Recently, they created an LT option. They say it in a way to make sure consumers know the original option was not discontinued.

 

 

Also, there are a few LTx guys that want to run a conventional distributor.

 

Googled it ... I see lots of intakes for LS series engines ... all of them have runners longer than 2 1/2 " ............................ Even the fabricated ones ..............

 

i think badss was the only guy who really gave some feed back on the first. I too had looked at them, it seemed like the cost to do a gen1 build that was in the low to mid 500hp w/o smog was tall. i did not want to comit to a complete build around a first with what seemed like lil dyno#, et's, mpg, ect. and again [U]smog[U] thats when i jumped ship and started the lsx road. bang for the buck was no contest [U]and[U] it would be comliant califorina sux for sure. i really would like to see a 396ci gen1 first build. that was my build and backed out from fear of the unknown. i think first would do well in the corvette community to do a similuar build for all the cards to be on the table. it does look to have great potential. i wish greg would have done one, alot of questions would have been answerd. not all but alot. its an expensive proposition to build a solid motor these days, not to mention the demands of the drivetrain that need to be met$$. so who's the FIRST ginny pig!.

 

Thats the way they shoulda came

No intake I know of has a 2.5" runner

 

I keep reading this thread and its posts and I has to ask.

The LT intake came out in 1992, 19 years later a Tune Port Intake comes out for the LT1 and LT4. Many L98 upgraded their intakes to HSR, mini ram, Super Ram etc.

Which LT owner would downgrade to a TPI intake? If the L98 gains horsepower using an aftermarket intake, the LT would loose HP.

Why? Would this be considered an "upgrade"?

 

Forgive my ignorance on this stuff but I enjoy learning. Isn't a distributor up top ran by the gears below (cam? or ?), or is it an EFI distributor? Is there timing involved this way and how does the ECU fit into all this?

 

I didn't have to. Several other members have gone down this road. That includes vette owners too.

Z01#316 (ran both SR and FIRST on his 383 and likes the FIRST better.)

btr85vette (reported buying one, didn't report back on it.)

Notice this was with stock L98 heads! See what I bolded below...

 

The stock and the modified ones like FAST LS intake are designed around the stock engine. Since different combinations of LS engines are being built, then the intake has to able to be mathed to the combination by different methods. As with the TPI, Super ram, LT1, Mini ram, and FIRST intake they all have their own nitch that they work well in. Also plenty of the LS engines are running some type of Carburetor.

 

Thought you all might appreciate some pictures.

Here are a couple shots of the stock TPI base compared to the ported FIRST. The runner entrance on the FIRST has not been "gasket matched" to the runners yet and are basically as cast 1.85" openings - still a huge difference compared to the stock's 1.47 - 1.52 entrance.

Notice in the second picture how the runners are raised and make a much nicer transition to the heads.




The first pic in this group is a comparison of the plenums - Unported FIRST to stock TPI. The FIRST is wide open on the inside and the exits to the runners have a nice wide radius as cast.

The second pic shows a "gasket matched FIRST runner on the far left, stock TPI runner in the middle, and a fully ported (rough cut) FIRST runner on the far right.




The first picture in this series shows the rough cut ported FIRST base I'm planning on using on a 406 on top of a stock FIRST intake. Material was welded up at the intake flange to match the intake to the heads I'll be running which are CNC ported Dart 220s standard 23-degree heads that have been off-set ported (semi-raised) and opened to the equivelent of a 1207 Felpro gasket. The stock FIRST is sized to a set of stock heads, but believe it or not can be gasket matched to a 1207 Felpro in its standard location.

The bottom picture is the fully ported (rough cut) FIRST and shows how wide open you can get the transition point - pictures don't do this thing justice,,, it looks more like an oval port big block intake than a small block TPI system.



Last but not least a runner comparison. Stock TPI to Ported FIRST

 

Thanks BadSS for showing the pictures. It should give and idea of what can be done with the First for those who do not know and have never seen one. I bet that setup can flow some serious air and support well over 600hp.

 

no 350 LT1/4 intake equipped motor on the planet will make that. EVen if it is a 383 that is huge torque.


FIRST still a step backwards?

 

I would like to see his dyno printout. Sounds like a big downshift peak to me.

 

I agree, there is something funny with those numbers. Downshift spike or flash stall speed spike.

 

I have to assume the dyno was crank power not rollers. And, for a 383 with smaller TFS 175 heads. AFRs would have kicked it up higher.

 

Here are some pics Ken sent me:

 

The FIRST is Sexy!!