I am buying a shortblock in the near future (within a week or two) and have narrowed it down the these 3 due to price, Quaity, and feedback on here. They are all 370ci 6.0L with forged internals. The plan is to have a daily driver with a lot more muscle than before that can handle a little n2o. Let me know what you guys think.

1st up we have Combination Motorsports. Their 370 Real Street includes...

LS1 6.0L iron block
New GM LS6 Cast Nodular Crankshaft 3.622" Stroke
Eagle Forged H-Beam Connecting Rods 6.125"
Diamond Forged Pistons 4.030" Bore
JE Plasma-moly Piston Rings
Clevite H series Cam, Rod, Main Bearings
Fully Balanced
Assembled short block complete with build sheets

2nd we have HPE. Theirs has...

HPE 370 Shortblock, New GM LS6 Cast Nodular Crankshaft 3.622" Stroke, 4340 forged 6.125 H Beam Rods, Wiseco pistons. Fully balanced and blueprinted with a 1 year 12k mile NO POWER ADDER warranty.

3rd we have Late Model Engines. I don't have the list of what they use but several people are fimiliar with their service, quaity of work and what not.

Any experiences with any of these sponsors would also be great...I just wanted to see what you all have to say. I know they have all been good to fellow members, I can't find much if anything bad on any of these sponsors. I would feel pretty safe with any of the 3 above. The prices are all about the same. CMS is offering free shipping right now and a 5% discount so theirs is a little cheaper, not so much as to where I would only buy from them. All 3 shops have a round a 3-4 week waiting period so that will not be a big deal, I would love to have the engine running but good things are worth waiting for.

I'll let everyone know what I do and how it turns out...

Thanks alot guys, Byron Taylor

 

Just so you know, all use the stock crank.

 

i've heard nothing but good from LME and HPE

 

None of the above. I'd do a LS2 402, or a dry sleeved 4.125 bore LS2 with a 4.125 crank or wait and see what kind of frankenstein can be built with the LS7. If it doesn't cost much more than what you're doing, why settle for ONLY 370 cu in?

Note that the one you selected won't warranty your N20.

 

They won't warranty any n2o...I'll get it make sure it is running correctly before I do that. I looked into the 402s but so far it has kind of been a hit and miss with SLP's 402. I know there are others that make it but they do cost quite a bit more. With the set ups above i am looking at ~$3,400.00 roughly. That LS2 from SLP is $3900-$4000, and from other sponsors it is a little over $4000. I don't have that much or I would be getting a 408. Also I can't wait....or dont want to anyway.

 

I'd build a forged 346 for what you are doing. Depending on what your goals are i see no reason to add 80lbs to your car when you don't need to.

 

370 is not a bad choice. You can definitely wind it with the short stroke and make reasonable power with the larger bore. The fast revving nature of such an engine makes it very appealing. Adding extra stroke adds some torque, but the real horsepower gain comes from using 4"+ bore on the superstrokers.

You could rev that to 7500+rpms with the right valvetrain and then match it up with a head like the AFR 225 to make some serious top-end horsepower.

Go with whatever is cheaper between LME and HPE. They both make a quality shortblock.

 

Well I thought about that and iron block seems to be little better in the long run...or so I've heard and read. That would be a little cheaper, but not too much cheaper. probably $300-400. I would like to have a FI someday but I think it will take winning the damn loto to do all that...we'll see. For now I will have to stick with spray. Also wanted the option to upgrade the crank later on and get the 408ci.

 

Heads will be ported 5.7, Dual Springs, Titanium Retainers, and a 238/242 .609/.612 112 cam...Who knows. I will still be using the ls6 intake, stock TB & MAF, SLP lid for now though. Exhaust is Hooker Headers, TSP ORY, and stock catback but I do have a cut out in front of that.

 

If I recall, SLP and SDPC both had iron block 402s for 3500-3600, thats only a couple hundred more than you were going to spend anyway. You get the extra cubes, plus a forged crank. The aluminum ls2 block is nice, but $500 is tough to justify when money is tight.

 

Yea the iron block is 3500 I believe...but some members have had problems with them "consuming oil"...I don't want to take that chance if you know what I mean. Plus they are "racing engines" and if something is wrong, you are supposed to fix it...In other words, if it's not right from SLP it's not their fault...no warranty, no nothing. They won't even let you pay for them via credit card, it has to be a certified chack or MO. That way you can't "cancel" the transaction.

 

Also can't forget the shipping...thats another $100 for crate fees, and another $300-$500 shipping. I wonder why it's so much for them to ship it and only $250-350 for another shop...LME, HPE, CMS...to ship one? Who knows. Plus CMS is offering free shipping. But by the time you pay for the crate fee & 500 shipping...I could have bought a 408 from any of the other 3 shops listed. the total then would be $4200-4300. But a good thing with SLP's ZL402 is that they are ready to ship. I've heard of a one week turnaround on these shortblocks. So you could have your motor in 2 weeks, on average from the time it takes to send them a check or MO, them to cash it, they said 48 hours, then freight to your house, you're looking at 1 1/2 - 2 weeks. So it's not but an extra week or so...so that doesn't help a whole lot.

 

Well, SLP does not have the greatest rep around here. I would still strongly consider contacting kris jones at SDPC and seeing what they can do for you.

 

SLP is a good thing IMO...look at the "ss" and "firehawk" but that engine has just had some problems that I can't afford to deal with right now...SDPC...got a # for them or are they a sponsor? I can't recall seing or going to their website.

 

Theyre a sponsor. They have a good reputation for having great customer support. Kris is very active on the forums and has been vey helpful to loads of people. This thread should get you started:

https://ls1tech.com/forums/generation-iv-internal-engine/243997-ls2-402-short-block-sdpc.html

 

SDPC is a sponsor on the right
also you can read about their ls2 402 in the ls2/ls7 internal section

all 3 companys listed + sdpc have a badass setup and pricing AND customer service.

 

SDPC Doesn't offer any iron shortblocks at this time. I have called LME, CMS, and HPE all numerous times and have had great customer service with all three...I wished I could buy one from each shop but finances won't allow it. The LME short block seems to be a favorite for now...it's internals are as follows...

Wiseco Pistons
Callies H-Beam Rods
Stock Crank
Childs & Alberts Rings
Clevite Rod Bearings (trimetal) CB663H
Federal Mogul Main Bearings (trimetal) 152-M
DuraBond Cam Bearings (One piece) CH10
ARP Main Studs

 

did you pm or call KJ at SDPC? I'm pretty sure they can/would build you a iron block....

 

Yea I called after looking on the site. he said theat it would be a custom build and they would do it for $3600 or so (402 or 408) but I think I will stay with the three companies listed. I think LME has the best deal, ~$3,000 with the current sale but not counting shipping...but CMS has theirs for ~$3400 including shipping...(no cores on either one) so all in all abou the same. the only difference I can see is that the LME has Callies Connecting Rods but in my old SBC I had just as much luck with the Eagle as I did with the Callies. I know the Callies are supposed to be better, but I don't know that I would say thay were ~$500 better, IMO, but that wasn't with the ls1...it was a SBC.

 

BTW an iron block is 92lbs more than alum.
I'd go with LME in a heartbeat, they are having a GP on 408 right now.