HighOutput Engineering LLC

Merry CHRISTmas and Happy New Year from us to you! Here's to a Great 2026!

2 sets about 1/2 way done and 2 more on deck!
Big stuff for big bores. Getting closer! #313

Finished up this nice 96" today while watching the AMRA qualifying on YT!
Should be a good one!

Here's a visual of how big the manifold port openings are for the Billet heads. L to R
Stock 88 Twin Cam
1.800 HPI Twin Cam
Carb S&S B2
My 64mm 3.75 in² port
My 64mm 4.4 in² port.

2nd pic stock 88 vs 4.4in²

This one has some "Pop" to it! Should be a runner!

The part a lot of people don't realize that has to be done when making a new cylinder head that has moved and rotated valves is making sure that a piston can be made to accommodate such changes. Valve relief clearances to ring lands and proper compression height so wrist pin isn't into oil control rings. We know that they make support rails for oil rings, but try to stay away from them if possible.

Note- piston has no skirt. This was just to find where the wrist pin will live

#313