360 magnum. 1 piston lower in cylinder??
This is going to be a budget street engine built for reliability with about 375 hp and 400 tq.
To get to your power target is gonna take about a 235@050 cam right? Which being about a 288 roller, right? so say you get a 284/110 cam.
the Ica is gonna come to about 68*
Your Scr with 62cc heads is gonna come in at about 9.5
Static compression ratio of 9.5:1.
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 7.39:1 .
Your dynamic cranking pressure is 146.31 PSI.
V/P (Volume to Pressure Index) is 119...................................... 119VP
You see that VP of 119?
VP is a performance indicator of how the engine will perform from stall to about 3000/3500
Since the VP is so low on this combo, I'm guessing you are planning on purchasing a Hi-Stall TC and some bigger rear gears. I hope so, cuz if not, in comparison a stock 5.2 Magnum makes about
137VP.
Here is your same engine, but with the Scr jumped up a bit
Static compression ratio of 10.4:1.
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 8.06:1 .
Your dynamic cranking pressure is 164.08 PSI.
V/P (Volume to Pressure Index) is 133.............................. 133
You see that VP of 133? Still less than the factory 5.2 Magnum......
but an improvement of 133/119=Plus11.8%, for your combo, which is similar to going to a 3.55 rear gear from a 3.23; 3.55/3.23=Plus 9.9% TM
3500 with 3.23s and 26 inch tires, and a TF is about 33mph
The power of that 284 cam will peak at about 5600, so the torque peak will come in around 4100 rpm or 38 mph with 3.23s.
So now add up the cost of the hi-stall and bigger gears, versus a set of hi-compression pistons, installed.
And I would recommend floating the pins,at extra cost,so next time you can separate the rods out yourself
Next time?
There is always a next time, when the engine ain't stock no more.
Now here's the secret; the compression jump will allow you to run about one size smaller cam. So say a 276/110
Static compression ratio of 10.1:1.
Effective stroke is 2.77 inches.
Your dynamic compression ratio is 8.04:1 .
Your dynamic cranking pressure is 163.55 PSI.
V/P (Volume to Pressure Index) is 139................................ 139VP
See there you go, back to 5.2 Magnum status, and you can run the factory stall and gears, if you are so inclined. You could even run a 2bbl on that.
I have; on a 340LA with complete 318 top end, with it's factory 240/248/112 cam. How much power did that make? Well considering that it was now nothing more than a hi-compression big-bore teener, not much.
But ohhhhhh the torque! It was amazing.
The way I see it, right now you are about $600 to $700 away from having a dynomite short block; that's pistons and boring and a clean-up.
Or you can put it together as is, and spend the 600/700 on a good TC. Your call.
If you try this with the stock TC, whatever it stalled at before you took it apart, now with the 284 roller in it, it will stall at less......... because of the lost cylinder pressure.145psi@119VP is not good..163/139VP is excellent for an iron-headed, tight-Q, 360
Just trying to help.
Happy HotRodding
