Backward-solve from a power and budget target to a validated block, head, fuel, and boost combination — reasoning shown, not hidden.
01
Set your target
Pick a starting archetype or set every field yourself.
Engine platform
Build archetype
Power target
Budget for the build
Aspiration
Block preference
Fuel plan
The one thing you don't want to happen
Chassis context
02
Recommended build
Estimated power
—whp
Estimated build cost
—USD
Horsepower Torque
Reliability
Confidence
Projected confidence growth as the dyno database fills in (mock)
03
Where this sits on the compatibility map
The block/head pairings this platform's builders actually argue about.
04
Dial it in
Nudge the two levers that move this build the most and watch the numbers react live.
Boost target
Cam aggressiveness
05
Compare against another path
See what a different archetype would have cost you in whp, dollars, and reliability.
Compare your build against
06
What we ruled out
The engine's other candidates, and the specific number that closed each one.
07
Take it with you
Copy this into a note, a forum post, or a builder's quote request.
08
See what this runs
Send this exact build's power and weight straight to the drag strip calculator — no retyping.
This is a worked prototype of the recommendation logic — every stock/forged/sleeved threshold below is drawn from real, documented builder and community consensus for that specific engine family, not a single formula reskinned across platforms. Honda K-series and B-series thresholds come from published block-builder guides tracking stock, stock-sleeve-forged, and fully-sleeved ceilings separately per block. 2JZ-GTE's famously high stock ceiling reflects its factory-forged rods and piston oil squirters. LS thresholds reflect the well-documented "500-600rwhp on stock internals" consensus, with the iron LQ9 block running slightly higher. The plan is to replace the mock confidence counts and growth curves with real numbers pulled from the KSwaps dyno database as it fills in for each platform.