Godbold thinks it would be revealing to do the same test with a much smaller set of three cams in the same application. "Then I think you would see a wider power range on the wider separation cam," he observed. "I still think 107 would give you the best peak numbers, but the wider separation cams tend to fall off less beyond peak power." With smaller cams running at a lower rpm, we'd probably be able to see that. But for now, we've got a very clear demonstration of the advantages-namely a more usable powerband-of running a narrower LSA.

LOBE SEPARATION ANGLE EFFECTS
NARROWER LSA WIDER LSA
Increased overlap Reduced overlap
Increased low-rpm torque Improved top-end power
Narrower powerband Wider powerband
Reduced idle quality Improved idle quality
Increased cranking compression Reduced cranking compression
Decreased piston-to-valve clearance Increased piston-to-valve clearance
406 STROKER SPECS
Displacement 406.0 ci
Bore x stroke 4.155 x 3.750
Rotating assembly Probe forged steel crank
  and rods
Pistons Probe forged
Heads Dart Pro 1 227 CNC
Compression 11.1:1
CAMSHAFT 1
107º LSA Comp Cams Hydraulic Roller
PN 12-000-8
Grind No. CS 3318S/3319S HR107+4
Gross valve lift 0.562/0.580 intake/exhaust
Valve lift w/ 1.6 rockers 0.600/0.619 intake/exhaust
Duration at 0.050 248/254 intake/exhaust
Valve timing (@ 0.050 lift) Open Close
Intake 21 BTDC 47º ABDC
Exhaust 58 BBDC 16º ATDC
Vacuum at 1,000 rpm 6 in
CAMSHAFT 2
110º LSA Comp Cams Hydraulic Roller
PN 12-444-8
Grind No. XR300HR
Gross valve lift 0.562/0.580 intake/exhaust
Valve lift w/ 1.6 rockers 0.600/0.619 intake/exhaust
Duration at 0.050 248/254 intake/exhaust
Valve timing (@ 0.050 lift) Open Close
Intake 18 BTDC 50º ABDC
Exhaust 61 BBDC 13º ATDC
Vacuum at 1,000 rpm 7 in
CAMSHAFT 3
113º LSA Comp Cams Hydraulic Roller
PN 12-000-8
Grind No. CS 3318S/3319 HR113+4
Gross valve lift 0.562/0.580 intake/exhaust
Valve lift w/ 1.6 rockers 0.600/0.619 intake/exhaust
Duration at 0.050 248/254 intake/exhaust
Valve timing (@ 0.050 lift) Open Close
Intake 15 BTDC 53º ABDC
Exhaust 64 BBDC 10º ATDC
Vacuum at 1,000 rpm 8 in