340 street build help from experienced input
I checked with Wiki and she says your location is at
close to 6000 ft elevation. Up there, you are gonna need some serious Compression ratio, to get some serious cylinder pressure, to get moving off the line; cuz the 69 Barracuda is kindof the Tank of A-bodies (see note-1) but with iron heads you are sorta limited to 160/165 on pump gas.
With a starter gear of 2.66 x3.55= just 9.44; and
3.55s and 27s will get you
60=5140 in 1.92 second gear, 65=5570.. This is about right for a fast-rate 224/230/110 cam; but again, you will need to keep the pressure up or get a heavy flywheel.
With an Scr of about 11.2/1, and with an Ica of 63*, the Wallace calculator is predicting that the bottom end will be similar to a 5.2M at take-off.
To get to 11.2 with a 4.06 x3.315= 42.92 cubes/703.276 swept, will require a maximum total chamber size of 703.28/(11.2-1) =
68.95cc, with a Tight Quench of about .040 or a lil less. That will take care of the bottom end, but the cranking cylinder pressure is predicted to be 157psi, so
getting the ignition timing exactly right might be a lil tricky. I'll say start of with 12* at idle, increasing to 28*@2800, and delaying the all-in to 34* at 3600. That will get you
in the ballpark. She will want a big V-can of at least 20*
Happy hotRodding
note-1;
My 68 weighs 3450 me not in it, with an aluminum top-end and an aluminum trans case but with a GVod (advertised 23 lbs) and full-length, dual 3" exhaust (measured 72 pounds), and very light kidney-slot mags.
I ran about the same sized cam in my 360, namely
223/230/
[email protected]
but my 367 is pushing 180psi with alloy heads so I have bottom-end to spare. I was
exceedingly happy with that set-up.
