will this improve my hp alot? i'm thinking about getting it and i'm curious how well it works. thanks

 

By itself? Not as much as with runner/plenum improvements as well as a cam..

 

i still have the stock plenum and runners, but i have exhuast, mild cam, forged pistons at a 10:1 compression ratio, airfoil, and homemade ram air. what could i expect with the big mouth manifold?

 

Dont bother. The TPIS big mouth is an Edelbrock manfiold with TPIS' name on it. You can save a bit of money by buying the Edelbrock one. Its worth it, as the intake manifold is the most restrictive piece in the TPI setup. The runners are a close second.

 

Actually, the TPIS base is not a renamed Edelbrock..... It is its own animal.

 

Last i checked, edlecrock was casting all of them (which admittedly was a long time ago) . The only difference is that TPIS does a little bit of port matching to it before they deliver it. If a little port matching is worth the xatr $$$ to you go for it.

 

I would go with the TPIS setup.

 

Well what would be the most for power, the new intake (runners/plenum ported out/new base) or a mini ram or holley jet ram....cuz those are one piece, so all u have to do is tear the old TPI off and slap one of those mothers on...would that help him more?

Zach

 

STEALTH RAM

 

cuz by the time u buy all the TPI parts, althought I do agree the TPI is the sharpest motor GM has made to date, the single unit intake may be cheaper and more effetient for the HP..I was wanting to get SLP runners, Edelbrock intake, and port my plenum, but by the time u buy it all, ur lookin at one of the single units, that's much easier to install/remove in the future...What does everyone think?

 

i was just at edelbrocks website and they are selling a manifold and runners together, but they said it will give you 18-20 hp. i thought a performance manifold and runners would give more of a gain in hp. is it really worth the 4 or 5 hundred dollars for a 20 hp gain?

 

hell no!!

you can just siamese your own base 2 inches deep and vuala, restriction gone, say hello to more hp for free.

 

I think if you want to pass emissions you are very limited in what your choices are...

 

Go with the Edelbrock. It's about $100 cheaper. All your paying for is to have TPIS's name cast on it and the "porting wizard" to take a die grinder to it for 15 minutes.

 

Where's your proof? I offer as Exhibit A my brand new TPIS big mouth manifold that has Edelbrock's 3860 part number cast into the bottom of it. Every one I have seen has this. Sounds like its an Edelbrock base to me.

 

Kevin91Z, what were your gains with the big mouth manifold? i'm still not sure if i should go with that and a set of new runners, or the stealth ram.

 

I dont know, I did lots of mods at once. 280 RWHP to 318 RWHP with a cam swap, larger headers, and TPIS intake and runners. If you dont have to worry about emissions, the new Holley Stealth Ram seems to be the best choice.

 

go with the TPIS if u are going to be doing alot of high HP/tq stuff. *like above 400HP* if not get the edelbrock 1.

 

Uuugh, You would think someone with power #'s like those in your sig Could Come up with a more intelligent reply. Are those real Dyno Numbers, or is that what Desktop Ooverestimato Tells You ?

Am I the only one that Noticed that Kevin has PROOF that the Eddiecrock and TPIS castings are the Same ?

Why Do people not Read the WHOLE thread before posting...

Oh yeah, and Injectors Don't Run Lean. They May be to Small, But I assure you they arent Running Lean.

 

Glad I listened right the 1st time when I bought my Edelbrock base a year ago :>

Thanks for the proof Kevin...

 

Hmm.... Sounds like I may have been misinformed. I'll get back to you though.

 

Let me save you some leg work, heres a pic of my TPIS manifold waiting to go on. I spent extra $ for nothing it seems but oh well its bought and paid for what am I gonna do now cry about it??

 

You guys know what is funny I just went outside and looked at mine and it doesn't have any casting numbers on the bottom of the manifold. Tpis does port the bigmouth. The manifold ports are ported more then the edelbrock. I have always heared that the edelbrock and the TPIS are one and the same.

If it matters the manifold is about 5 years old I dont' know if edelbrock started casting the pn. in at a certin point in time or if mine is just a freak?

 

What about the Accel intake for the superram, I was gonna use that intake with SLP runners and port the hell out of my stock plenum...Any body have any info??

 

instead of buying the big mouth manifold and new runners i think i'm just going to get the holley stealth ram. it's cheaper and i think it'll give me more power, any thoughts on this?

 

I think you have the right idea..The tpis setup is a great street intake and if I had it to do over again with fi I would go a stelth ram or LT1 intake.

I just think there is something great about poping the hood and seing that gorgious tpi intake

 

I just installed the HOLLEY STEALTH RAM, IT FLOWS SO MUCH BETTER THAN MY OLD FULLY PORTED SIAMESED RUNNER TPI INTAKE THAT I GAINED OVER 1000RPM MORE IN THE USEABLE TORQUE RANGE, THE ENGINE PULL MUCH HARDER FROM 4500RPM AND UP BUT DID LOOSE A LITTLE TORQUE IN THE 1000RPM-4500RPM RANGE BUT REMEMBER YOU DON,T RACE IN THE 1000RPM-4500RPM RANGE , YOU RACE IN THE 4500RPM AND ABOVE RANGE!

 

I spoke to TPiS about them using Edelbrock castings 2 years ago & they said at first they were using Edelbrock unfinished castings but now use a local foundry for their castings. The casting # only means they are probably using the old molds from Edelbrock. I tried an Edelbrock base 2 years ago & had several problems with it. It finally went back to them due to a misdrilled injector retainer hole, it was drilled clear through into the intake port, causing a major vacuum leak. I only discoverd it after having it on & off 3 times. I then got an Accel base & got a nice performance gain as well.

 

TPIS doesn't port them anymore, they still charge the same tho.

 

I just opened my TPIS Big Mouth intake tonight. Mine looked like it was slightly ported by *someone*. The casting lines inside the openings were ground away and there were metal shavings like it'd been drilled with a big drill bit. From where is anybodies guess. The bottom of my base has the 3860 cast into it. I ordered mine after seeing it was possibly an Edelbrock base but TPIS had them in stock (recieved it in 3 days) and the Edelbrock base is on backorder from Summit. I'll be putting my engine together possibly next week or the week after that.

 

69TPI383
Im building a 496 efi for one of my vettes, look here, this setup can support up to 900 hp with the correctly chosen parts

http://www.holley.com/HiOctn/ProdLin.../MPFIS.html#10

http://www.holley.com/HiOctn/ProdLin.../9901-201.html

http://www.holley.com/HiOctn/ProdLin.../9900-171.html

http://www.holley.com/HiOctn/ProdLin.../C950MPIA.html

 

That looks like a good system and I've been hearing alot of good about it too. I imagine if I ever get my present project done I'll most likely up up building a 488 - 496 instead of the 468 listed in my sig.

Thanks for the info!

 

Which manifolds have the most room for porting? Or if you will siamesing?
Factory intake
TPIS Big mouth intake
Edelbrock intake
Thanks guys:hail:

 

The factory intake has hardly any room at all for enlarging the inlet ports. In that aspect the TPIS/Edelbrock has a bunch of room for enlarging. I just bought a TPIS Big Mouth intake and recieved it yesterday. If not for Summit having the Edelbrock base backordered...that would be your best bet dollar-wise. It looks to me like the same base and all TPIS does is a little cleanup work. And I DO mean *little*.

As for siameasing each one, again the stocker looses out. Look at pics of both and the TPIS/Edel base can be siameased from top of opening to top of opening. The stock base can only be opened up a little in the middle due to the *flange* being bigger than the actual port.

 

Thanks 69TPI383 :hail: