Something offered for an midwinter discussion straight from the
Cobra 427 Chassis Manual.
427 High Performance Engine Specifications
Intake valve opens 0.006 @ 48 Degrees BTDC
Intake valve closes 0.008 @ 96 Degrees ABDC
Duration 324 Degrees
Exhaust valve opens 0.006 @ 96 Degrees BBDC
Exhaust valve closes 0.008 @ 48 Degrees ATDC
Duration 324 Degrees
Valve opening(Overlap) 96 Degrees
Ford Distributor
Maxium Centrifugal Advance Degree Limit = 16
Maxium Vacuum Advance Degree Limit = 8 1/2
Initial timing = 8 Degrees BTDC
A deep breathing cam with generous overlap, 8 Degrees Initial plus 16 Centrifugal Timing with 8 1/2 additional Degrees vacuum on tap (57 crank degrees seems to be rather stiff timing even for 60's leaded fuels)?
-Any Thoughts - I have interest because even with the Paxtons my FE seems to love timing. I am no longer locked down at 10 degrees centrifugal and 12 degrees initial timing for 32 degrees total. I am advancing slowly upwards with spectacular gains. Currently it seems to have maxed-out at 13 Centrifugal, 10 Initial, 14 Vacuum. (50 crank degrees max with vac) 92-93 pump Octane
-Geary