Small Hughes cam in 318
D100 pickup, 3.23 gears for now, O/D and 3.91 later.
I thought I was using a small cam. lol
Oh that hurts,
Well .........................................................................a cam costs about what gears cost, and a proper "small"cam will let you keep the 3.23s, with the right TC.
Yup I caught post 4, it looks like you did your homework OK.
I put a 318-4bbl into my son's 84 D100 with 3.55s and 275/60-15s, and a 2800. That was my winter motor, a
stock 1973 8/1 engine. and a SG,lol. And an A998 with the 2.74 low gear in it.
That thing was smoking hot. Sliding sideways thru the sweepers. But that truck had no traction, and terrible wheel-hop.. I had to fabricate a pinion snubber that was ugly as sin, but cured the wheel hop, while helping in the tire-smoking take-offs. That back-end weighs nothing! It wasn't long and we swapped OUT the 3.55s in favor of 3.23s. He liked that better, as he was spending a lot of money on gas. He was just 19 at the time. He drove that truck for maybe 9 or 10 years, as I recall.
3.91s might be a lil crazy, unless you figure out a way to make it hook.
But they are the right gear to use with the Dodge od trans. This will get you about 65=1800rpm with 28s. But that cam ain't gonna like 1800 much. Ima thinking 2200 or more, maybe best economy up near 2300.
The 3.23s and 28s will get you 65=2650ish, and that cam will be well into it's efficiency zone by then. Slow that brick down to 60 and you'll be at 2450ish, right on target. Put a 2.74 low in her, and a 2800TC and you're back in action.
If it was me, and I don't know what all your targets are,and if you don't have the SCR for it, I'd pull it. It's just wrong in too many ways, and at this point you can save the lifters. Just my opinion.
My second cam was a Hughes HE 2430AL, with specs of 223/230/110. The advertised was 270/276/110 so that's 47 degree ramps, none too fast. The overlap on that was 53. In a 367 with aluminum heads and a 10.9 Scr, she pulled real good fuel mileage, even down at 65=1600rpm. Compression is king!,lol.