14lbs and pump gas? What kind of pump gas you guys got...or your using alky or meth?
well Race-Prep is pretty close to me and I might have to take advantage of the free STS turbo install if I buy the STS T70 from them. I just didnt think the STS kits made too much power? Is there a reason why there kits dont come with a intercooler? I really want to go with speed incs T80R, how would you guys compare the the T80R vs the STS T70 with a 410ci?

Also what size pistons would get me 8.5.1 compression with ls6 heads 64cc and stock height gaskets?

 

The TTI 80 Race Kit (A2W, no AC), Speed Inc T80R kit (A2A, some pipe work) will make more power at lower boost than the STS T70 (pipe work with intercooler choice) would. You'd use a different turbo and intercooler to attempt to compensate for this on the 410 STS combo in order to reach the same targets. The things to balance in this are ultimate power goal (call it 750-850 to allow for pump gas plus some sweatner octane later), cost for complete kit installed and AC decision.

Things to remember will be selecting the piston/heads combo to get the desired 8.5-9:1 compression. Your current heads are worth money when going after some of the new 72CC nicely CNC'd heads which are relatively low cost and allow you to keep more meat on the pistons and therefore more combustion up in the chamber. Once the heads are picked then your piston will follow. Don't play gasket games with this power range.

Next on the list is fuel system. You're looking at sizable pump like a Weldon (can be loud but are rebuildable), Aeromotive (seem to have mixed succes) or the dual setups like Speed Inc offers (potentially quieter and trigger the second pump to come on when you need it which is good when it works and bad when it doesn't). More fuel means better fuel lines and fittings going to bigger fuel rails with regulator (Weldon, Aeromtive, Speed Inc). The Mototron 60 injectors will handle this range nicely.

If you can get it, plan on the Sunoco 94 as the base fuel. That's the top of the pump gas realm. If not, then you can look at 91-93 range and see if you need some meth later on.

Stock PCM will run this power range fine with the Motoron 60s and HP Tuner or LS1 Edit.

Rick

 

I built a 409 it has ross pistons ls6 heads stage 3 lunati guts studs for head bolts,oringed block,can handle 30psi! I havent installed yet cost of eng. is about $ 13000 the problem is fuel delv. for the beast! 80# inj.

 

I forgot to mention 8.5 to 1 comp.

 

I'd go with the Speed Inc. T80R. And don't go smaller cubes....you will be kicking yourself in the *** when it's all said and done, because it will be much more streetable and fun to drive the the larger displacement. That 410 will have the T80 spooled in no time flat. And you can achieve huge power numbers much more safely on pump gas with a large engine. I'm basically reiterating what everyone else said, but take it to heart. What's an extra 1-1.5k when you have so much more hp and tq?

 

Well I have decided to build another 410ci for a T80.
My motors up for sale if anyones interested. Then the heads/nx kit/headers y pipe/fuel cell are for sale next
https://ls1tech.com/forums/lsx-parts-sale/314412-new-410ci-stroker-shortblock-forged-arp-studed-o-ringed-has-6-500-a.html
Like I said its just too much money for me to take it apart, rebalance and assemble.

Just got my new custom made 410ci Stainless steel emblem today that I have been waiting for 6 months!!!!
so I gotta stay with the 410 cubes now

thanks everyone for the good information

 

You would honestly save money by selling a motor for less than you put it together for, then buying/building another one new vs. simply paying a shop to swap out a set of pistons and do a rebalance? Wow.

 

keeping the shortblock
buying new pistons, rings,new turbo cam = $1,000+
disasemble, rebalance, assemble = $1,500
total cost $2,500 or so
so $2,500 + $6,500 I already have in just the shortblock = $9,000!!!!

sounds crazy? yes
would I save money? yes about $2,500

vitamanz
what size pistons did you go with to get your compression at 8.5.1 with ls6 heads with 64cc?

 

Its not a fair comparison to total all the work done to one number...they are not the same motor in the end. Buuuuuut...to each his own.

Oh...and to get a 410cid to 8.5:1 w/ 64cc chambers, .040 total quench (figure .007 out of the hole w/ a .047" gasket...no figuring in how big the cylinder hole is in the head gasket) = -38cc dished pistons. I don't think that's gonna happen. I bet he has -22ish cc dishes and a 70-something cc chamber.

 

I see what your saying
I am getting the second motor built at a lower price. The shop said since they already did one motor for me they will give me 25% off.
Going with all the same parts unless theres a better 4.000 crank,rods and pistons to go with for a turbo?

Yeah I was wondering how he was able to do that with ls6 heads
Thats why my heads gotta go and get AFR 225 with 72cc

 

Any forged crank/rods (within reason) will work fine. People have used Callies, Crower, Eagle, Lunati, etc. with success. If you are looking to save cash, All Pro heads are a little cheaper out of the box, and you can always get a set of 6.0 heads or even ls1 heads opened to a 77cc chamber by someone like TEA and save major $. If you feel like you're down on power...just turn the ****.

Save up for BS3 and option down (within reason) on the rest IMO.

 

If you're building another motor STAY STOCK CUBES, the money spent on a 410 isn't worth the gain. You'll see huge backpressure with the 410 blowing through a single T4 exhaust housing, and there is absolutely NO way I would run that with an STS setup. Look at mightymouse's dyno, think he has any problems with lag? All that 410 inches is going to do is give you a motor that detonates much quicker than a smaller cube motor because of how much exhaust backpressure there is, choke off the turbo, and roast the tires a bit quicker on the street. By going with a 348 instead of another 410 you'll save a significant amount of money on the crank, etc, that could easily be put towards a better EMS, better turbo kit, etc.

 

Pretty much what I would have said.

Single Weldon pump will be noisy, I sold mine and went to dual Bosch 420L's.

Speed Inc. turbo kit has done 850rwhp no problem.

 

You forgot to include.....

SALE of UNUSED pistons, rings, and current unused cam. $1,000+ (actually should be noted as -1,000+ accounted into the final dollar amount.)