• Fully Forged Aluminum LS3- 376-416-427- Longblock w/ Frankenstein M311 Heads 1000/1200hp

Fully Forged Aluminum LS3 376/416 STAGE 3  Short Block

Blue printed NEW LS3 aluminum block Gen IV

Your choice of CP Carrillo, Diamond, or Wiseco Shelf Pistons

Callies Compstar or Manley H-beam 6.125" Connecting Rods

Callies CCW 3.622" or 4.000"  Crankshaft

king main bearings

king rod bearings

Thompson Motorsports single piece racing cam bearings

Steel ring set

This short block is rated to 1000HP (1200HP with ARP main stud upgrade)

12 month unlimited mileage warranty with the purchase of a new melling oil pump from TMS

Frankenstein Thompson Edition M311 Heads

11* CNC ported aftermarket casting 6 bolt heads

Extreme duty stainless intake and extreme duty solid exhaust valves

Billet Rocker Rails

PAC .007" platinum springs

Thompson Motorsports custom ground Camshaft

Thompson Motorsports custom length Chromoly pushrods

Stock replacement bolts ARP HEAD STUDS ADD $366 OR $400 FOR 6 BOLT(if on dart you must add $400 option)

Melling Select High pressure oil pump 

Billet adjustable timing set

Thompson Motorsports high RPM lifter set 

Trunion Upgraded Rockers 

GM MLS head gaskets

GM lifter trays

Thompson motorsports Professional assembly and 12 month unlimited mileage warranty

For warranties and policies: https://www.thompsonmotorsports.net/warranties-and-policies.php  

***If, turbo, supercharged, or Stroker motor please add a High Pressure/High Volume oil pump for warranty"(if you do not add this pump for these application warranty will not be valid)***


*A crate is not required for a customer pickup, only an engine stand*


Call for any questions: 972-853-2450

We are located at: 

545 Justin Pl.

Nevada, TX



All motors could require minor modifications for install (drill and tap holes or clearancing). These changes are minor and can be performed with simple common tools. Thompson Motorsports is not responsible for the work required nor does this warrant a reason for the return of the product, even in the case of a direct replacement. We are dedicated to customer service and are more than happy to help with the install in any way possible. Please feel free to call or email with any questions or concerns.


 All high performance motors will come with no VVTI or DOD. If the vehicle originally had either or both of these you will need to change to a LS2 front cover and LS2 valley cover to eliminate. You will also need to alert your tuner to the changes for PCM changes.

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Fully Forged Aluminum LS3- 376-416-427- Longblock w/ Frankenstein M311 Heads 1000/1200hp

  • Product Code: P-E4S-22
  • Availability: 1000
  • $14,519.96

Available Options

Tags: TMS Longblock, aluminum longblock, frankenstein, custom longblock