383 Horsepower Estimates

Alright guys, the engine is totally figured out. After debating 355/383, I'm going 383. Might be a daily driver but I'll take the MPG hit and enjoy the torque :)

-2-bolt Block
-Scat 9000
-Scat 5.7" I-Beams
-TRW Hyperuetic Pistons (.030" Over)
-AFR 195's
-10:1 Compression
-Ported TPI Base/Plenum
-SLP Runners
-52MM Throttlebody
-XR276HR (224/230 @ .050, .535/.544 with 1.6 rockers)
-Proper Tune
-SLP Shorties

Any ideas of hp/tq? With the 6-speed and 3.73's, track times?

I'm ordering the rotating assembly ($539) in 2 weeks and porting the base/plenum in 1 week. The rest should come by next fall.

-Corey

i do believe afr 195's and a tpi ported or not is kinda pointless? I doubt even if you did some awesome port work on the tpi that it could flow more then the afr 190's could support. Why not get a mini-ram, spend an extra 5 hundred on the rotating assembly and go forged, and then have 500 ponies knocking on your door?

Nice little combo. I'd say mid 12's if you don't break anything or miss a shift. Get a better intake, and 11's are not out of the question.

Maybe 450 ish??The toque should be Awsome!...Better put some money in a good driveshaft/U-joints...
Low 12's/high 11's, if you get the gear/tire sizing worked out for your powerband...
Figure on 24 or 26# injectors??

Near "Zero decking" the block and running 6" rods will help it be more Octane freindly by controlling the "quench" and "piston speed" at "top" somehow, I forgot the details, it was kinda technical...

This is a torque motor, better suited for the TPI, in my opinion...:think:

:bow: :bow:

I guess I'm one of the few... but I agree with Doug. Those heads FAR exceed the limits of that intake. If it were me, I'd convert a carb intake. Even a Miniram can die early. It's not much better than a slightly ported stock LT1 intake.

I say 350hp.

I didn't put this in my first post:

I'll eventually step up to some kind of Ram. I'm undecided which one. It'll be a few years from now, figure get the right heads the first time (they're $1200)

-Corey

Originally posted by Rippin92RS
I didn't put this in my first post:

I'll eventually step up to some kind of Ram. I'm undecided which one. It'll be a few years from now, figure get the right heads the first time (they're $1200)

-Corey

you want to know what I have to pay for 195 AFR`s $2500+tax man some times it sucks being a Canadian:( and I really hate saying it but it`s true :(

so I`m going with the Vortecs on my 383 or maybe camel backs I can get rebuilt ones for $1000 I don`t know what the vortecs are yet?

I want the AFR`s!!!!!! :cry: but there wayyyyy!! to much :cry:

Rippin, nice sounding combo. I'm planning on building one exactly like that for my 84 Camaro, however I'm going with a carbed setup. AFR 195's and all.

I would like to know where you got the rotating assembly for that price at, I'll buy it immediately if I can get a deal like that.


Thanks,

Nate

Nate, I'll PM you.

-Corey

With that tpi why not go with some ported afr 180s? That'd be a torquey freakin motor.

I'm having trouble seeing a MR or even LT1 dying early, I mean with a 58mm/1,000cfm T/B...I just can't see it. Some people are as stuck on carbs as I am on my TPI...:D
Carbs require way too much tuning, trick parts, and many have to be adjusted even for different weather conditions to be consistent...when you get serious. I'll stick with EFI...For Life!...

I'd say a TPI, with Large Tube Runners(not siamesed) and a fully ported or aftermarket base, is a PERFECT MATCH for a 383...I don't see 195's taxing a healthy TPI to any extreme..:think: :confused:

Originally posted by 90rocz
Some people are as stuck on carbs as I am on my TPI...:D

I'd say a TPI, with Large Tube Runners(not siamesed)

Amen bro!

Why not siamese the runners? Should I do any work to the SLP runners?

okay im going to step up and give my opinion again. First of all i dont know anything about those internals what are they made of? If you toss a mini-ram on that motor youll need forged internals or youll blow it up.

As for what youre doing i understand as to a lack of funds. What you will truly have is a miss match. The ported tpi is a high velocity low flow intake, where the afr 195's on that motor are going to be very high flow heads. Due to this fact that there will not be a large volume of air coming through the intake and the heads will kill your velocity, so you end up with a low flow, medium velocity motor. It will still be a lot better then stock though because those heads are truly amazing. I'm going to bet high 12's just due to the tpi and the fact that i doubt youll have perfect traction/shifting unless youre some sort of car god that i was not made aware of.

I understand youre trying to put this motor together and due to a lack of funds it all cant be done at once so what youre doing still makes sense, but dont expect miracles out of that tpi. With a mini-ram 500+ hp and low 11's is definitly achievable. I totally forget stock cam specs but i do believe that cam is a fair bit larger....should be well suited for those heads and with a proper intake youll be off to the races as long as you dont blow up your motor. I also wouldnt rule out getting a custom grind cam when you upgrade intakes to get the most out of that motor, again youre gonna have to be careful depending on what those internals are?

TPI is going to hold that motor back.

Originally posted by 12Second3rdgen
TPI is going to hold that motor back. haha that would be the short answer to my long winded post ;)

Sorry, but i can only agree to a point, a "modified" tpi won't be far behind a MR at holding things back. (Key word "Modified")
AFR's main selling point was how they maintained velocity and increased airflow...right???
I've "beat this dead horse long enough", I've done the research, I stand behind my posts..:)
Make sure you're NOT standing behind someones elses opinions, or hearsay, get some numbers for yourself...
I'm still trying to figure out how a MR can blow up a motor tho..:D :confused: :D

I don't understand why a MR would blow up a motor either :confused: :confused: Anyway, since you're going at this from a budget stand point, you really should look into the stealth ram. Good results for a reasonable price. You can almost pick up the entire setup for the price of a set of SLP TPI runners.

tpi+afr 195's+****ty internals=350 hp?=probably okay motor

mini-ram+afr195's+****ty internals=450-500 hp?=blown up motor

As far as "hear say" no i dont have any hard numbers. As far as i know and everything ive read it is virtually impossible to get past the 12's with a tpi no matter how ported? I could be wrong but thats the best i have been able to establish. I would like to see a well ported tpi flow benched against a mini-ram and see which one flowed better and by how much.

You don't need flow bench results, the mini ram will out flow pretty much any long runner TPI setup.

Originally posted by 90rocz
[B]Sorry, but i can only agree to a point, a "modified" tpi won't be far behind a MR at holding things back. (Key word "Modified")[B] Tell that to this guy, he wanted evidence, i dont have any, seems neither do you, but that is the general consensus.

I got your evidence, check out my posts in LT1 vs L98 thread..:)