Which heads?

that 6901 is not as small as you might think;
276/288/114 advertised;
218/[email protected]
.441/.441lifts
"Fair-smooth idle, low-midrange power. Works with stock-2,000 stall, 9:1 and higher compression, and gearing."

the only thing small about it is the lifts.218/228 is a nice size tho.