Don Terrill’s Speed-Talk

Once the throttle is cracked, the ported and manifold vac's effectes are the same This does not happen immediately on tip-in, but when the throttle disc's edge passes the VA port. This is determined by how high that port is above above the transition port (or the top of the slot). In certain carbur...

Your manifold's divider wall is almost gone.
Close it up. Instant vacuum improvement.

Stoichiometric means chemically correct. All energy present is liberated. Running WOT @ 14.7:1 (by weight, since gasoline weighs approximately 640 times as much as air, the proportion by volume if fully vaporized is about 9,400:1) leaves much power on the table . Light tip-in at cruising speed @ 14....

Even with all my errors, which of you already posted that DCR results may vary widely?
[crickets]

W/r/t V12 crank to fit 2 X V6 blocks. The correct timing interval is the usual 720° ÷ number of cylinders = 60°. If the V6's cylinder bank angle is 60°, you're good. If they were early Buick V6 (derived from the small Buick V8) at 90° adjacent crank-pins must be offset by the missing 30°. More of my...

Gene Adams, one of the greats, passed away last year.

Herbert did a 2 X 400 SBC, and remarked that he thought the bad vibrations were due to separate distributors. He was looking fo a Marmon, etc. V16 distributor.

The 8.20" deck had a single purpose: to fit under the hood of a Falcon, I'm sorry, Mustang.
If you have the room, the taller deck reduce problems.

An old rule: "if it doesn't breathe well, compress the h*** out what you can get".

My 2JZ 3 liter makes about 520 hp at 17 psi with the stock head.

Flow bench tests give results at all lift levels.
Do they test at every piston position 40 degrees B/ATDC with the actual piston in place? Then it won't show up on a test.

What does a prepped 2JZ-GTE chamber look like?

#1 reason for sharp edges in prepared heads?
Highly $killed labor needed to finish them.
Once the piston drops ATDC, the huge shape & volume change disturbs flow into the cylinder.
Greatest effect @ low lift, helps most if the OL window (valve lift X degrees open) is too small.

Math: Stock 289: 2.87" stroke, 2.249" mains, 2.123" rods has traditional OL [ (main + rod - stroke) ÷ 2] ) as .751" (linear inches). However, GM and others use a more complex formula to calculate the actual shared cross-sectional area (shown here: https://mathworld.wolfram.com/Circle-CircleIntersect...

As air density goes down, heat removal by convection is reduced.
Don't lean it out too much.