For an early 340
to be at 10.5Scr, the Total chamber volume needs to be roughly
(340/8) x16.387 /(10.5 less 1) =73.3cc
The X-head chambers by themselves might be close to that, then add gasket, add eyebrows, subtract pop-up, add back a lil clearance volume; and what do you get?
>with pistons only .018 up out of the holes; I'll guess 84cc or so, and Scr falls to 9.29...........
> with pistons .045 up, I'll guess 78.3cc, so Scr of 9.89 ...............
But that stinking 114LSA factory-cam in at 110, drops the Dcrs of those to 7.43 and 7.89, at 900ft elevation, which is well into pumpgas territory.
The lower the Dcr goes, the more lazy the low-rpm is.
By the time the Scr is 8/1, the Dcr becomes 6.43, and I'ma thinking she will burn any old puke gas, but be turd-slow on the take-off no matter what gas is in the carb; 6.43 is pretty low, lower even than a Smoggerteen which being 7.10, also at 900ft.
