100% street
Depending on your intended useage, gears, willingness to run a hi-stall, etc.
low-rpm torque is king; and that starts with pressure and cubic inches.
After cubic inches has been selected, all you got; for bottom-end, is pressure.
The factory 318cars were duds for two reasons; they barely made 135psi, and they were stuck with horrible gearing. Remove those handicaps, and a 318 can be a blast.
Same goes for a 340, except the early ones already had pressure. But for a streeter that also needs to run hiway, the go-to rear-gear is 3.23s If an automatic, that usually spells a soft take-off, until you install a TC with a stall between 2500 and 2800, depending on the pressure left over after the cam is installed.
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Here is a bit of ; what you need to know.
Lets start with 340 and a true 10/1 Compression ratio.
And lets install the factory 340 cam; 268/276/114 in at 110, the intake valve will close at about 64* ABDC. Thus, this engine, at 800ft elevation will make about 159psi cranking pressure,with a P/V index of 126.
Pressure of 159psi is as about good as it gets for a 340, to still run on pumpgas.
But that P/V of 126 is pretty low; about what an injected 5.2M makes. P/V is a number that levels the playing field between engines of varying sizes and pressures and is a low-rpm performance indicator. So any two engines with the same P/V index are gonna perform about the same, up to about 3000/3500rpm.
