LSs1Power

iTrader: (5)

The plan is to max out the D-1SC and run 100-150 shot of Nitrous on top of it. I figure the D-1SC would give me 15-17psi on a 347 and 12-15psi on a 402. The larger the displacment the slightly higher the C/R would be since it has more surface area(less prone to detonation) and most likely is going to see less boost output from te D-1SC giving the same pulley combo. Heads are going to be either ET's or AFR's 225cc. Pistons are going to be from CP with lowered rings to handle high boost and rods are going to be Oliver billet ones. Ofcourse all of the shortblocks will have ARP bolts and studs to keep it together.
The question is.... Is it worth it going with more displacment and spending more money on the larger shortblock for this combo which is D-1SC and 100-150shot of Nitrous?

EPP

iTrader: (22)

If you have the money to spend on a larger displacement shortblock, then I would go for it. Even with forced induction, there still is no reason not to go with more cubes, as it will make more torque and more hp. The LS2 block is what I would start with for your requirements. Bob

LSs1Power

iTrader: (5)

I like the idea of the LS2 due to the weight savings over the iron blocks. I have read about few conversion to LS2. My only concern would be the knock sensor. They are saying you will have to drill somewhere in the side of the block for the knock sensor, but wouldnt that hinder the knock sensor performance or sensitivity?

EPP

iTrader: (22)

The knock sensors are relocated in the LS2 blocks. All you have to do is get the LS2 knock sensors, extension harnesses and a few other items, it's an easy swap. Bob

LSs1Power

iTrader: (5)

110 views and 9 votes only! Guys it won't cost anything to vote u know... believe me its free lol.

kp

iTrader: (34)

I would probably do the 370 with an LS2 block, once you hang 100lbs of blower stuff on the front its hard to hang another 100lbs for the iron block as well.

Nice to have the 4" bore and the ability to use bigger valves w/o shrouding. Plus the LS2 blocks are cheaper then new LS1/LS6 blocks I think right now. The LS2 will need some other different stuff besides the block so there is more cost then iron but when you reach a certain point a 100lbs can be more expensive to lose..

OTOH if you have a good LS1 block/crank its the cheapest route to do a 347 with nice rods/pistons of course

LSs1Power

iTrader: (5)

I never thought of a LS2 with stock crank, but it sounds good too. It would be at least $800-1000 cheaper since it will have a stock crank.

Wet 1

iTrader: (4)

I'd start to worry about running 16 # of boost + a 100 shot on a stock crank. With 4" bore, good heads, and cam, you're talking a lot of power, enough that I'd go with a forged crank to be safe.

LSs1Power

iTrader: (5)

Few guys took the stock crank to 20psi+ with Turbo setups. I'm guessing 16psi from a D-1SC in a 370 with 100shot should be making anywhere between 750-900rwhp. I think a stock Crank would take it if everything was done right.

LSs1Power

iTrader: (5)

So far most votes are towards a 402 or 408 which surprised me. I was thinking the use of boost and NOS would make the gains from a stroker or a slightly larger displacement (Not more than 408 compared to 347) less effective.

Wet 1

iTrader: (4)

If all out power is the goal, I'd suggest the 370 with the shorter stroke (using a good crank) and spin the **** out of it with a big turbo(s). On the street I'd go with as many cubes as possible for the tq. I guess realistically any of the combos can make more power than you'll ever be able to plant to the ground.

LSs1Power

iTrader: (5)

I was thinking about going Turbo, but since i have the SC already NOS will give me all the missing TQ and area under the curve that a Turbo will provide with better topend. So im staying the D-1SC and a small shot of NOS. I decided on the heads. The only thing that i was having a hard time deciding on is the short block. I was leaning towards a forged 347CID with 215 or 225 ET heads, but now after seeing all the votes im thinking maybe a 402 LS2 is a better choice.

Wet 1

iTrader: (4)

Look at it this way, you always see guys looking to go larger, but how often do you see the big cube guys saying they want to go back to 346?

Given your criteria, I'd suggest you go with the LS2 and a larger set of ET heads (240-255). I'd guess you could max the blower around 775-800 rwhp. With the 100 shot you'll come close to 1k. I'm not sure how long an LS2 would hold those levels, but the setup should be capable of producing the numbers. If you're looking to make this kind of power consider using the iron block for longevity.

zachness

i would steer clear of iron blocks. wieght is counter productive especially over the nose. forged aluminum is the answer!

ls1290

iTrader: (20)

Not always true. It is pretty easy to shift things around to offset the extra weight of the iron block. Ditching the AC system moving the battery to the rear is more than enough to offset things.