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So what you are saying is that we got it close right out of the box.
It means your engine is not far away from a healthy stock B20B.
The rods and pistons were acquired as they are lighter than stock, improve dwell at TDC, have the rings closer to the top of the piston etc.
Rings closer to the top is good for the enviroment, but you don't need a long rod to do that. Lighter than stock is good too, but it makes a lot less difference at the rpms you intend to run.
improve dwell at TDC
What does that mean? Two very negative things that increased rod/stroke ratio does is:
1. Reduce resistance to pinging & detonation.
2. Reduce torque output below peak torque, which is contray to your cam & head choice.
The bottom end on the B20 block that I bought had the '75 rods - which as the heaviest and weakest rods that the B20 ever came with. Surely you'd have changed them out in a performance engine?
I would have got an earlier block, late blocks are a last choice. Noticably soft & don't last as long as the earlier blocks.
Your rods & pistons? They would be fantastic pieces in an engine with 48mm DCOE's, 40 to 50 degrees more cam duration, .100" more lift, better intake ports, big exhaust & running from 5000 to 8000rpms.
Can we just let this thread die? It is rather pointless and off topic.
I'd say it's on topic, you mentioned your engine didn't you?
How the heck would 4.10's deliver better economy? Are we breaking laws of physics now? How is 3.73 too tall? The performance does not suffer at all. Random thoughts are always welcome.
I doubt you would have said that if you knew what a BSFC curve is.
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Forgive me Father for I have sinned... [120-130]