PREMIUM SteadFast 12 Valve Cummins Long Block

At SteadFast Engines we do love high-performance builds but deep down we "geek out" when it comes to longevity builds. This package is the ULTIMATE reliability/longevity build for a 12 valve Cummins. If you're looking to build a lifetime truck, a hotshot rig, or any application where extreme demands are prevalent, this is as good as it gets.

• Patented Total Seal Gapless piston rings
• Our proprietary upgraded pistons
• Cometic upgraded head gasket
• Head studs
• 60lb valve springs
  
• Modified Cummins 8.3L 6ct oil pump
• Larger piston cooling nozzles
• 24 valve tappet upgrade
• 2 year warranty

Buy a set of our injectors with your order and and increase the engine's warranty by an additional 6 months

Buy a Swift Turbo with your order and increase the engine's warranty by an additional 6 months.

With this build you will have the highest quality lubrication of any engine. This engine is designed to outlast and outlive ANYTHING else on the road, a true cockroach, all while handling increased output from a bigger turbo or larger injectors.

Steadfast Stage 2 Cylinder Head Option: Thinking of building a p-pump 24 valve? Maybe this option will help you reconsider. Take your 140CFM restrictive 12 valve cylinder head to 175cfm--straight to 24 valve cylinder head territory. Not only will your peak flow numbers be slightly better than a factory 24v head, your low rpm intake air velocity will be higher thus helping you to spool a bigger single more effectively. Get all of the pro's of a 24v cylinder head without the cons.

24v head castings are more prone to cracks and dropping valve seats. With a 24v cylinder head there are 12 more opportunities to lose compression through valve leakage over time... besides that a 12 valve sounds cooler than anything else on the road!

While you're at it save your $1750 worth of acorns on the P-pump conversion lines and connector tubes. 

• Hamilton 3mm oversized valves
• Rotler 607 performance valve job
• Cylinder head porting
• Stiffer valve springs

Pricing is with exchange of a good core

No core to return? The core charge is $1500

Core isn't in ideal shape? No worries. We won't automatically hit you with a $1500 fee. Send us what you have we and we can at least give you a partial or majority core credit. Hole in the block? Pull your head off and send it to us. We can at least give you the $500 core credit for the cylinder head.

Must make contact with us before purchasing an engine

Custom builds available