Freefallin

Ls2 based resleeved 454 or Lq4 based 408??
Trying to figure out which would be more practical in a DD that will go through plenty of boost and spray.

The car is a O5 GTO that will spend %70 of its time on the street and the rest at the track.

I understand i dont need so much cubes if i am going to boost and spray. And that i just need a lot of boost and spray. But there is something that ive been trying to understand for a while now and i cant seem to find the answer.
Is the following true or not:
If i start off with big cubes, then i will not need a lot of boost and spray to reach 1000 rwhp. Example: if im making 700 rwhp NA with a 454, then i could reach 1000rwhp with a small to moderate sized blower & "some" spray.
Whereas, if i start off with like 500 rwhp with a 408, then i will need a large blower & a lot of spray to reach 1000 rwhp.

Is the above logic true??

Reason i would like to know is cz boost costs $$. I would rather invest not-so-much on a small blower and reach my goal of 1000rwhp instead of spending large on a large blower. I know displacement costs as well. But considering the 454 and the 408 are already available to me (hypothetically) for free. Which one would be the cheaper route to 1000rwhp?

Gunslinger09

408 and turbos will get you there no sweat.

Freefallin

im sure it would. But question is, how big a turbo is it going to be compared to the turbo that will get me there with a 454 build

0silverado4

408 and turbos would certainly be capable of your goals. However you need to throw the word "cheap" out of your vocabulary. Just having the rest of the car at a level to handle that power will be a considerable expense. Cheap is subjective as I don't know your situation, whatever your budget is double it and you might have enough.

LLave

iTrader: (3)

Have you ever had a 400hp n.a. daily driver? Especially one that is reasonably light weight? Having daily drive a sbc powered 240Z has really opened my eyes to useful and realistic goals for the street. Dont get me wrong, 1000hp sounds awfully cool and you will get way more attention than my 400hp ratty Datson i am sure.

Good luck with your quest.

Freefallin

Not cheap but cheap"er".
Like which one is cheaper, a Bugatti Veyron or a Maybach?? Now certainly non of them are cheap, but one of them is definitely cheaper.

Freefallin

Im trying to find out what size blower i would need to reach 1000rwhp on a 408 making, lets say, 550rwhp NA...and what size blower i would need to reach 1000rwhp on a 454 making 700rwhp?

mchdg86

iTrader: (3)

A supercharger can only move so much air so you will need the same size blower to make 1000 hp no matter what size engine its feeding. The bigger motor will need less boost though since you are cramming the same amount of air in a bigger hole. A procharger f1 will get you the power you want.

LPE 403

iTrader: (6)

First thing you need to do is stop thinking you're going to make that much at the tire NA with would have to be a low compression piece.....then....THEN think you're gonna force feed enough air to make another 300-400.

Sorry to be a synic but damn man....and don't get me started on the DD

redtan

iTrader: (5)

This. A 408 built for 550rwhp N/A will be a poor choice for boosting to 1000rwhp.

And a 408 built for boosting to 1000rwhp will make poor power N/A.

So start with an end goal of power and get there. Don't worry what it makes half way through the build.

DACTARI

iTrader: (1)

That's exactly what he's doing. He's trying to figure out optimal displacement before he starts his build.

Gray86hatch

iTrader: (83)

you say daily driver but want 700 na hp out of a 454 that is going to be a radical piece. Mine makes that and I would not drive it every day unless it is all I had to drive.

Making mid 550 and put 20psi on top of it will make a nice drivable piece. Now you need to look at keeping head gaskets in it. So 6 bolt stuff is deff needed.

Tim

Freefallin

Excellent point redtan. I was just trying to make a point. Apparently i failed. I dont know how else to ask the question. Ive asked the same question so many times in so many ways and its like everyone is just purposely avoiding to answer...or answering something im not asking. Let me try one more time.

My question is...

Forgetting the hp #s i gave... In order to make 1000rwhp with the least expensive boost, should i 454 or 408?

redtan

iTrader: (5)

You can surely make that power with a 408. Set it up right, boost it enough and you will get there. No need for a 454 unless you have the money.

Loudpipe

iTrader: (11)

Took my 408 with a 300 shot made 987rwhp in race trim.(a little lean) makes 500rwhp n/a. Drives great. It's been "cheaper" to go with spray than boost for me.
Like my grandpa told me one time."speed cost money son, how fast you want to go"?

SpiceRedLS2

408 with a F1 Procharger, FTW

blake b

iTrader: (11)

377 and a ysi

Slowhawk

iTrader: (12)

Big cubes can make it easier to hit hp goals and keep drivability.I don't think a LS2 454 could withstand the boost needed for 1000rwhp/ street car though.
I do know a LS2/sleeved 427 can . You will need an F1 blower to do it.