Any complaints with CNC motorsports LS short blocks
 

https://www.bbb.org/south-dakota/bus...and-complaints

I would read the BBB reviews. According to one customer's review the engine blew up after 23 laps and CNC left a message nasty message written on the windage tray. The other review is interesting too.

https://www.cnc-motorsports.com/faqs
The return policy is 20%, you pay shipping both ways BUT apparently no returns on short blocks, engines or cranks.

https://ls1tech.com/forums/lt1-lt4-m...rsports-2.html
Some CNC Motorsports stories and a couple of horror stories with the engines. 2010-2015


Doing a search on Yellow Bullet showed a lot of good review around ~ 2016
Parts buys good, the stuff I found engines pretty good.

http://forums.corral.net/forums/5-0-...topics/1342396
Some of the stuff like cylinders didn't appear to be honed....probably 80% good & 20% bad

Time to ask..



https://cimg4.ibsrv.net/gimg/ls1tech...267fbbe585.jpg


Getting burned on an engine purchase is about as much fun as staring down the wrong end of a Magnum. I got burned once by Doug Herbert performance who was local to me. Burning $4500 in cash would have been more fun than dealing with DHP.

Best of luck with the new motors.

My impression & opinion based on a brief Internet search is CNC might be OK for simple parts.

No way I would buy a short block or engine or crank after what I read.
If you are local to CNC then you might be OK.
A lot of businesses do better taking care locally than someone a thousand miles or more away.

I the sort of person that's much happier to pay Lingenfelter Performance or Thompson Motorsports or Texas Speed or Reher - Morrison or Bischoff Engine Service or other good LS1TECH vendor a little more and not worry. All of the ones named have a good reputation.

Scoggin Dickey Performance Shop

Wow! 383 LS short block $3895 or LS 427 short block $5196
​​​Scoggin Dickey has me wanting to do a new motor :)

Uh-oh... S-D has led you unto temptation....

Ls427
 

Yeah, but its prolly a LS3 block w/ 4.100 crank

Your right. It's not an LS7 4.125 bore w/4 inch stroke.

​​​​​​I guess my "new daily driver" an 02 Z28 will just have to keep chugging along with the original 242,000 mile LS1 for a while longer...

I have the LS3 427 from sdpc, it runs strong haven't had any problems with it.

How many miles? Any oil consumption? I would like to hear more details.

The oil consumption is about what my ls1 was not much. I have 9000 miles on it. I wouldn't worry about the 4.100 stroke they built plenty of them.

Thank you Cup, that's good to know.
​​​​​​Sounds like an excellent set up.

Im curious too on Cnc Motorsports

CNC MS sounds spotty. OP might want to look into Thompson MM. THEY Seam to have a good rep hear and real food customer service

I got my rotating assembly from them balanced. Good prices. Everything seemed to check out.

I don't know if I would trust them to do a short block. But I don't trust many to do it...

Another vote for Thompson. They have a great warranty as well

Seems there is always someone who has an issue with one company or another. Scoggin Dickey has been around a long time.