JaniH

oops, double post.

Tartilla

The limiting factor would be how much the 2.3" In valve shrouds the bore.

​​​​For an undervalved engine like the BBC, bigger valve is mostly better for sure.

I think the Flotek seats were cut so you could use a 2.25", as the seat area was quite a ways into the valve face. So your're getting the 2.3" valve shrouding without the best port opening width. But that may have just been those heads...or they've changed their process etc.

Rookie

iTrader: (4)

Bore notch the block.
0.340" lobe is still only 0.578" lift with 1.7 rockers. Throw 1.75 or 1.8's if you want more lift. What do the heads flow at 0.600"+
That single pattern cam looks like a cam my engine builder has. Where was it located?

JaniH

These flow numbers are from Eric weingartner, bore 4.310", lift 0.600", bad port 320cfm, good port 340cfm, exhaust 248cfm without pipe. Bores are notched allready and the crane golds have more ratio than stamped, 1.7 is closer to 1.8 than 1.7, the 1.8 golds are almost 1.9 in real world. The cam came from Chicago area, i also have dyno sheet of 540cid, 8.5 to 1 comp , 3 psi boost, with this cam.

JaniH

Here is the dyno sheet with this comp 236/236 112lsa cam, 540cid, 8.5 comp, 3psi boost. Wonder how much the blower extends the power band?