You will receive an email after placing this order to confirm freight and final shipping cost.
Engine core is not included. You will need to supply a healthy core or purchase a core from us.
If you're building a Stage 4, we already know what you're doing. This is drag car territory, or you're chasing a number most B58 owners will never see. This is our peak build, the one we throw everything at because anything less won't survive what you're about to put it through. Displacement moves to a 3.2L stroker as standard, not an add-on. Pistons are KLM Custom Spec, made to our own spec, not a catalog part with a rating stamped on the box. The head gets our KLM Spec modification, welding and machining to reinforce it beyond what the casting can handle stock, on top of the same 5-axis CNC porting from Stage 3. At 1,500 plus whp, the head has to survive just as hard as the bottom end.
Send us your engine or buy a core from us and we build the whole thing start to finish. Either way it comes back ready to run once it's through break-in.
Key Specs Rated for 1,500+ WHP. Our own shop car and several customer builds are currently running in the 1,600 whp range on this spec. This is our current peak build level. No stage above this exists. Every build follows our researched and validated Stage 4 spec. Individual engines are not dyno tested. Break-in period required. Instructions included with every build. Send in your own engine or purchase a core from KLM for a complete build. Turnaround is typically 3 to 4 weeks, occasionally longer depending on parts availability and build queue.
