Look, the stock cam puts the Dcr down in the basement at something like 6.85@125 psi, at 1300 ft as at Witchita KS. It already needs a loose TC and gears just to get out of it's own way........So almost any cam you put into it will just make the bottom end worse.
So now in goes the 218* which is maybe a 262/110advertised, and the ICA goes from 54* to 57*and the DCr goes to 6.5@122psi. So now the bottom end is even soggier. To get off the line will require maybe 2600 or a 2800 TC with those lazy 3.23s. And it will take off very little better than it does now with a 2250.Of course if she is currently saddled with a 1750ish TC, that 2800 would show a good improvement. But again, gains will be small as the rpm rises, and cylinder pressure keeps pace with it as the VE is rising;Until the torque peak is reached at maybe 3800rpm/34mph. From there to the Power-peak of maybe 5000, the new cam will make more power. How much? well considering the CI manifolds, and the low VE of the combo, I'll guess 20/25 hp tops. And 5000rpm is now 46mph.
But here's the deal; with the current 318TC, power will actually be considerably lower from take off to maybe break even at 2600/24 mph. So your ET from zero to 24mph will be
slower. Then that 218 will start to make power, so that by 3800rpm/34 mph it will be making a bit more power . So somewhere between 24 and 34mph
ET-breakeven will occur. I'll guess 28mph. Now that 218* with the 4bbls WOT will scream its way to 5500@50 mph.So, the ET from 28mph to 50 will be quicker, cuz those 20 peak hp are finally getting a workout.
For me, this situation would be completely unacceptable.I would just do the 2800TC first, and let the 2bbl stock-cam,360 spool up another 1000 rpm to be much closer to the torque peak.This will already be a good kick in the azz from zero to 34 mph, right where you want it; and that big 2bbl is good to about 34mph anyway.
The next step would be a free-flowing exhaust, to set yourself up for the 4bbl.
Next I would install the 4bbl, and get that to kick in as early as she'll take it. Baring wheelspin,the zero to 34mph-ET, with the 4bbl, is not gonna change much, but it's gonna sound like it. If you do get some wheelspin, then the ET may be noticeably reduced.
Once all that is done, then, THEN, she's ready for a
small cam.
If you do the cam first, in that lo-Scr engine,you are just setting yourself up for disappointment. Been there done that.And so have many,many others, including some right here on FABO.
But I just gotta reiterate; With an 8.0 Scr, and a Dcr of 6.5@122psi (with a 262cam;
[email protected]), this 360 is waaaaaaaaay below it's game. This 262/110 cam wants 10.0Scr to get a Dcr of
[email protected] you will have a screaming quick engine.