Kamaro

Brian Tooley helped me to choose a good street cam for a stock GM LSX-454 long block (234/246 .648/.630 115+3), and now I want to get the best intake/TB assembly to get the best out of this motor, streetability is a priority here and my goad to get at least 550RWHP through a 6 speed manual, I'm leaning towards a stock LS7 intake but I still hate to leave a few ponies on the table with the 90mm TB. opinions?

lil john

FAST intake gutted will set you back more than a grand. But the stock intake nor the FAST intake will keep up with a good pair of LS7 heads.
stock intake vs fast intake 20-30 hp difference.. if done right.

common sense

Get the Fast 102/102. Don't bottle neck that 454 with the stock LS7 intake and tb

ringram

Fast will give more, but if you look at the details its only from around 4500 up.
Mainly due to it moving peak torque up the rpm range more.

So question will be for your application where will you spend most of your time?
And is the extra $1k worth it?

lil john

True..

Pumba

I recently built a 451 CID engine - 12:1 compression - ALL PRO LSW12-1 heads by WCCH - 252/272 solid roller cam - Tony Mamo ported F.A.S.T. 102 intake and a Nick Williams 102 mm throttle body. During engine dyno testing, we ran a comparison of the 102mm throttle body versus a Mamo-ported 90mm throttle body.

The results were that the 102 made 8 hp more than the 90 above 6,500 rpms and lost 25 lb-ft of torque in the mid-range. I sold the 102 and am running the 90mm throttle body.

Kamaro

Well, then I think its wise to go with the stock LS-7 intake, since the engine wont see 7000+ RPM even at the drag strip. Do you think its necessary to port-match it to the LSX-LS7 heads that come with the LSX-454 long block?

ringram

Id send the heads to WCCH for their port job or similar.
The as cast ones leave a lot on the table with the 454.

common sense

I'd talk to Frankenstein Racing Heads, Tony Mamo, Greg Good or Darin Morgan @ Reher-Morrison before I talked to WCCH

Pumba

I would send your intake manifold to Cory Harris at LS2 Port Works- http://www.ls2portworks.com/Home.html

1989GTA

This intake is suppose to be on the market late this Summer. Might be what you are looking for.

briancb1

Speak for yourself bro.

I picked up a lot of power at every rpm with a port matched and fully ported FAST 102 intake and NW 102 throttle body on my 454 LS7.

Its worth every penny and its worth the effort to port match it and port the interior properly.

Pumba

Show us the data. I had Tony Mamo port my F.A.S.T. 102 intake and I used a Nick Williams 102 mm throttle body, and I did not see any gains over the F.A.S.T. with a Mamo ported 90 mm throttle body until the engine reached 6,500 rpms. Below 6,500 rpms it lost 25 lb-ft of torque in the mid range.

briancb1

Maybe you misunderstood me. I've never tried the FAST 102 intake with a stock ported 90mm TB.

I've only done testing with a stock ported intake with a ported TB against a ported 102 with a NW 102 TB. It picked up nicely.

Then a year later I tore apart the FAST 102 and smoothed out all the edges with a dremel, removed the interior ridge on the intake runner and cleaned up the port alignment and gained even more power.

I guess I could throw on my 90mm ported TB and see what it does against the NW 102, but I have no data for you for that comparison.

ramairws6

iTrader: (33)

Not sure what you have going on but I gained hp and torque everywhere with my Mamo ported Fast. I never tried a 90mm though? Had a 100 mm on before my 102 Nick Williams. Oh ya, I have data too https://ls1tech.com/forums/dynamomet...e-results.html

CAMSTER

iTrader: (10)

With the small cam you have the ls7 intake is just fine, however if you had gone with the proper street cam for that engine a Fast LSXR and a 102 MM TB would have been 40 HP better than the ls7 intake and 90MM combo you now stock with.

1989GTA

"Brian Tooley helped me to choose a good street cam for a stock GM LSX-454 long block (234/246 .648/.630 115+3)"

Sounds to me like you specified a horsepower peak around 6200 or so with a shift point of maybe 6500. As stated above I would stick with the LS7 intake with that RPM range.

LS6427

iTrader: (2)

I remember telling everyone way back when all there was available was 90mm TBs and intakes........I asked why the hell doesn't some make a bigger one, and EVERYONE on this site laughed at me and said there will never be a need for bigger than 90mm.......LOL

102mm TBs and intakes are WAY too small for these big cube engines. Someone needs to make a 125mm TB and 125mm intake.......Its gonna be here in a few years anyway.....why not do it now....?

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