This here is a good measuring stick between a 340 and a 360.
Having built a 360 with several different cams, but always at same pressure,and most of the time with 3.55s; I see now that the 3.58 stroke is over powering my tires and chassis no matter which cam it was running. Over the years I have become more tolerant of the 3.31 stroke engines, and next time out I think I will experiment on a 340.
As I have found out, the 360, for my application really is overkill, and I wouldn't mind a lil less torque out of the gate. I know I will be giving up power throughout the most-used part of the powerband, but that's OK, my 360 has too much anyway.
To get some top-end back, I will rethink my cam requirements, and swap to an SFT design.
I will continue to use my GVod as a splitter, and continue to use the Commando box. As for gears; I'll just throw some 3.23s back in there...... for now. lol. Why? Because 60mph=
5750 in First-over, maxing out my average power in two ratios, and 65=2030 in overdrive, providing great mileage potential. IDK what I'll use all the other gears for, but I think I can figure something out.
I will continue to run the Eddies, and flat-tops and a Tight-Q. I'm gonna adjust the Scr, to make ~190psi, and as for the Solid-lifter FT cam; I think I'll run a 106 design, with fast ramps and tight lash, and a power peak at ~5200, so maybe around
[email protected]; hyup I think I can make that work.
You see how I worked backwards from the gearing? For a streeter, it's all about trying to have the right gear at the right roadspeed,to be in the sweetspot of the TORQUE curve,in second gear cuz;
1) in first you will be smoking thru it anyway so you don't care about HP in first cuz even a 318 can do that. And
2) in second, you will almost never get to the power below 60 mph..... so why do you care about 450 hp at 5500, when even if you dare use 3.91s, this comes to ~75 mph with 27" tires!
With 3.91s, 60mph is ~4500, and so you should be thinking of maximizing your power at 4500!, not 5500.
So let's say that 450@5500 engine makes only 390hp at 4500, then you could build a 390Hp engine , that will have inherently more torque below the torque peak, and therefore make more average power, below 4500, and therefore should be quicker in the zero to 60 contest.
And with those 3.91s, 30mph with 27s comes to 3750 in first, 2220 in second. Now with matching cylinder pressure, you can run a lo-stall TC!,ans so.... Your rpm at 55 will be 2670@zero-slip, so say you run a 2600; yur all set!
No; you can't brag about your 450 hp Fire-Powered 1964 383 ; but who cares about that, if yur hitting 60 in the low 5s.
On the street,
it's all about the combo
