View Poll Results: Which Shortblock for this setup?
347 LS6 8.5 C/R
6
21.43%
370 Iron 8.5 C/R
8
28.57%
402 LS2 9.1 C/R
7
25.00%
408 Iron 9.1 C/R
7
25.00%
Voters: 28. You may not vote on this poll
Which size should i go with?
Which size should i go with? 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?
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?
Last edited by LSs1Power; Nov 29, 2005 at 09:37 PM.
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
Originally Posted by Exotic Performance Plus
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
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
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
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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.
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Originally Posted by Wet 1
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.
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.
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. 
Originally Posted by Wet 1
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.
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.
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.
