Thumpr cam crap

I drove the 292/292/108 for about a year. It has 76* overlap. If you put it in at 107similar to what I did at first, it will have the overlap split very similar to the 279 Thumpr. If you then give her what she wants as to timing and fuel.....and compression...... and a stock heavy flywheel, mine was not all that rough, and I could pull it down to 650 or a little less with the clutch; but she sure wouldn;t do that with timing locked at 36*. More like 5* down there and 14* idle and with aluminum heads and 11.3Scr, she liked 32/34 power-timing...... and burned 87E10.
If you have a TC you can run a lot more timing, and pretty early with the bigger TCs, cuz it doesn't get as jumpy down low;the TC smoothes it out. But.... if you fire it a little later as the peak-pressure occurs further down the bore, it smoothes out the idle. You just have to bring the timing in a little faster to be similar at stall, and then slow it down on the way to 3200ish,to prevent detonation. But with aluminum heads on a 318, and running premium gas;getting detonation might be a non-issue; cuz 9.5Scr is about all you can get at zero deck. And with that and an ICA of 61/62 the pressure should be fairly low.
This is a tricky cam, it idles like a 292, but as soon as it gets to about 2000/2200 it becomes a pussy-cat, like the [email protected] that it is.