bumpin_records

iTrader: (19)

im posting here due to the set up being a turbo set up. the dart heads out the box would they need to be ported? How much power can those heads make out the box with a turbo set up Pt91 370ci set up. Im looking for 1k at the wheels, can those heads do it or do i have to have them ported and I dont hear nothing about extrude hone. what happen to that, seem like that was a good process.

MIGHTYMOUSE

iTrader: (59)

stock heads can do it with enough boost and CI

Phate

iTrader: (2)

extrude honing is ridiculously expensive...I recently priced having some cast manifolds and exhaust housings done and they wanted $1250 and that did not include shipping back and forth...

bumpin_records

iTrader: (19)

hey mighty mouse whats up. well i wanna make as much power at a lower boost as possible. well i already have the motor 370ci so i want some heads that can flow a hella lot so i dont have to turn up the boost to force the air though. GUess my question now would be get the darts and put the rest of the money into something else than buying the afr or etp heads.

hey phate what heads are you running and what power level your at just wandering

1CAMWNDR

iTrader: (21)

What is the bore on that motor?

MIGHTYMOUSE

iTrader: (59)

to each their own but i don't understand why?

i consider boost psi a return on investment.

say now im making 1000 at 23psi or i could spend another 5k on severe headwork and make 1000 at 15psi. what did i gain other than the heads will likely give poorer low rpm performance and worse mileage.

discuss

RealQuick

iTrader: (14)

Motor longevity will be better @ 15psi then 23psi...

bumpin_records

iTrader: (19)

4.030

427

iTrader: (3)

Intake temps will be lower at 15psi, and it will scare you when you take it to 23psi!!!!!!


Kurt

Phate

iTrader: (2)

I am running stock ported OLD castings. Engine made 1100 on the engine dyno at W2W @ 20psi...I have since switched cams on W2Ws recommendation...car should be on the dyno soon. Should make 1000rwhp no problem.

MIGHTYMOUSE

iTrader: (59)

they would be lower for a given combination, but if you size the intercooler appropriate for the application it could be around the same. (20% bigger etc)

and since he is building for 1000rwhp, i assume he is not shooting for more than that after x amount of time.

real quick.. i need more info on longevity? engine makes 1000hp either way = same cylinder pressure no?

Pro Stock John

iTrader: (34)

I'd go with aftermarket heads for 1000rwhp, one value is having better clamping over stock heads. I think KP is running unported Dart heads. I'm running unported AllPro heads.

MIGHTYMOUSE

iTrader: (59)

im not saying its not a good idea to invest in heads as a mod, or that these are not good heads, but its proven it doesnt require them to make his goal horsepower.

Pro Stock John

iTrader: (34)

My 8:1 348ci made 867rwhp with 25psi thru an A3. I think 370ci with a 91mm turbo will hit 1000rwhp around 25psi... But just go for it and and keep us posted.

bumpin_records

iTrader: (19)

well i just got the engine back and i do have the money for the darts right now. Im gonna call speed inc tomorrow. I just wanted to know if i get the dart heads i dont have to dump a lot of money in them vs. just buying some afr or etp. I seen a set of etp's and i was very impressed with the cnc ports. Are the darts cnc ported? Mighty mouse i do see a lot of peeps runnins stock ported heads making some good numbers. Hell i have a set of 317's sitting next to the car right now but i dont mind paying for the darts if they donna do the job i want and that is hitting 1000 at the wheels. If you all say they will out the box im gonna get em this week. Now on a nother note. intakes i see guys running 8.50 with ls6 why buy a carb intake?

John hows the flow numbers on those allpro heads did you have to have any work done to them

Got Me SOM

iTrader: (2)

simply no. more efficicient the combinatin the less boost and cylinder pressure you'll need to make the power level you want.

427

iTrader: (3)

Boost is not "free" it just seems that way because its easy to turn up. Every time something in your system needs to work harder, something else needs to make up for it. The 1000hp dyno shot could be done with Dart 225's no doubt.
The higher boost engine will run more heat in the intake and ex. This will cause more chance of failure sooner, but how much sooner is a mystery.


Kurt

SScam68

iTrader: (20)

I agree, I don't know why in the world you would want to make the system work harder than is has too. I guess for bragging rights? To be cool?

I reasonably ported set of heads doesn't cost a fortune, you're in the right frame of mind bumpin.

bumpin_records

iTrader: (19)

well im gonna go for the dart heads. A lot of people are stuck on the term boost. Oh im running 30lbs of boost like the import guys. well i wanna say i made 1k at 15lbs of boost. So you can say im stuck on cfm's , I want as much flow as possible. I may not be right but i went with a 370ci cause i wanted a big bore with not a big stroke. i can spin it higher if i need to hopefully i dont. but do anyone have any imput on the intake theory. ls6 vs carb intake?

LS2Camaro

iTrader: (5)

That is a whole other topic all in its own, check out these Threads. These should keep you busy for a while.

https://ls1tech.com/forums/forced-induction/605899-reason-switching-carb-intake.html
https://ls1tech.com/forums/forced-induction/610806-what-intake-manifold.html
https://ls1tech.com/forums/forced-induction/608508-victor-jr-efi-intake-346-d1-worth.html