What kind of pistons are in there?

Looks great!
I don't really want to say that 100hp/litre is easy in NA form, but it sure is doable. The reason most don't see these engines around, is that they absolutely cost more than what the car is worth. For the amount of skill and effort required to build an engine like this, most opt for an easier solution of cubic inches (v8) It may not neccessarily be much cheaper, but if you want 400, 500, 600, or 700+ hp it is the most viable option.
Want to go fast? Cubic inches or Cubic dollars. Want to go faster?..then both!

I always liked the underdog!

You can have it Fast, Reliable, or Cheap. Pick two.

The engine is actually quite tame and should be dead reliable if cared for properly. There's low compression (street gas), relatively mild cams (easy on the valve train), and very durable internals. Here are the dyno sheets but be advised that it was run on carbs due to ECU issues. It will make MORE power with the TBs since they flow more air to this big 4-banger:

Definitely an engine that likes RPM. Which is odd for such a relatively large setup. You've done something phenominal here. Time to show the Honda guys a little of their own game. When it comes down to it, a motor is a motor- what you do with it determines what kind of power it will make.

Nice,
So other than the modest dispacement bump, cam what whats done to make hp? special headwork I guess. I can't see a 0.2L bump making that much hp alone.

The motor is clearyl making power all through the power band. It not just hight rpm because at 4500 rpm this motor is making more hp than it peaked at stock. Impressive.

how much do you want for such an engine..

:bowdown::bowdown:

what are manufacturing costs now that you have the design?

this would be my dream come true

can you share with us any info on the ignition timing, and by street gas do you mean like 91 or 93 octane?

also, custom cams?

I would be careful challenging his claims like that. He is a top notch engine builder and is very well known in the racing community. Just because he doesn't post on rennlist doesn't mean it's not legit.

Torque Curve over HP #'s gets you down the line

I'll address many of the questions:
-Bore is 4.155", stroke is 3.564. It's a stock crank offset ground and using Honda/NASCAR rod journal size. Rods are Pauters.
-The car in my avatar is my 'old' 924GTR that had a 3.0 NA engine in it. Ran PCA and HSR.
-Pistons are CP.
-Heads are ported S2 with 41mm intakes and 34mm exhaust valves.
-Cams are billet pieces with adjustable chain sprockets.
-Ignition timing on the dyno was 28 degrees.
-Fuel used was 93 octane bought at the Shell station up the street.
Cheers.

cool
https://rennlist.com/forums/924-931-...9-924-gtr.html
http://www.924board.org/viewtopic.php?t=27668

Since I assume this is for road racing/autocross can I ask why you went for that style torque curve? Doesn't really make sense to me because as I see your power curve you'd have to set your gears up to only drop the RPM from 7500 to 7000.