Knocking 340
I thought it was difficult enough running 10.5 on pump fuel, can 11.4 be ran on premium?
With aluminum tight-Q heads, some guys here on FABO have claimed 200psi on pumpgas, on the street.
IMO, the Scr is just a tool we use to achieve the pressure we think we can get away with.
In 1999, I thought I could get away with 11.3Scr and the 292/292/108 cam. I was right. Because the combo only hit 185psi, and it burned 87E10 with full-timing.
So
Yes it can be done.
At least on the street.
Because on the street,
firstly you can't get any traction, and
secondly,you are usually running less carb than you should be,and
thirdly, you are only ever at WOT for 5 to 6 seconds before speeding.
By 7/8 seconds from a dead stop, you could be doing close to a hundred mph. So the street engine is not very highly stressed.
In that 292 combo, I ran 245s out back, and traction was a joke. But it sure was a lotta fun.
Not knowing where the pressure ceiling was, each combo afterwards was also adjusted to run the same-ish 180psi.... cuz I already knew that ran on 87E10, which at the time was the only gas we had. So the next cam ran at 10.7Scr, and the current cam is at 10.95 Scr. All three ran at about the same 180 psi.
BTW, in a 360/A833; on the street, 180 is all you need; it's more than enough. The bottom end is ridiculously over powered with a starter gear of 10 or 11 to 1. And second gear will take you well into speeding territory. With a 223* or so cam, you can make fuel-mileage that a 318 could only dream of. Add an overdrive to it and the numbers go crazy.
I eventually narrowed the rear end and moved the springs inboard, so that I could run 275s and then 295s and then 325s. 325s proved to be a not so good choice in the stock tubs, for cornering, so most of the time I run the 295s.
So coming to the point; the 223 cam with 275s and 3.55gears was both quicker and faster than the 292cam with 245s; also with 3.55s.
The current cam is a 230*, runs with 3.55s and 295s, and is quicker and faster than the 223, which is to be expected. But man, this 230 sucks the gas on the hiway, even with the GVod. And it gave up a lotta bottom end torque. For which I finally got a lower first gear to cover it; 3.09 vs 2.66.
That 223* was my favorite combo of all-time.
