LT4			LT1
RPM	391 TQ (Ft Lbs)	391 HP (TQxRPM/5252)		385 TQ (Ft Lbs)	385 HP (TQxRPM/5252)
2300	329.00	144.08		329.01	144.08			LT4
2400	330.00	150.80		324.75	148.40			Peak TQ = 401 @ 4900
2500	331.00	157.56		320.50	152.56			Est Flywheel TQ = 472 (assuming 15% drivetrain loss)
2600	333.00	164.85		318.44	157.64			Est Flywheel TQ = 501 (assuming 20% drivetrain loss)
2700	339.00	174.28		316.38	162.65
2800	345.00	183.93		314.60	167.72			Peak HP = 420+ @ 6300 rpm
2900	353.00	194.92		313.11	172.89			Est Flywheel HP = 494 (assuming 15% drivetrain loss)
3000	362.00	206.78		311.61	178.00			Est Flywheel HP = 525 (assuming 20% drivetrain loss)
3100	369.00	217.80		313.00	184.75
3200	375.00	228.48		314.39	191.56			LT1
3300	379.00	238.14		316.59	198.92			Peak TQ = 349.5 @ 4500
3400	381.00	246.65		319.60	206.90			Est Flywheel TQ = 411 (assuming 15% drivetrain loss)
3500	383.00	255.24		322.61	214.99			Est Flywheel TQ = 437 (assuming 20% drivetrain loss)
3600	386.00	264.58		325.89	223.38
3700	388.00	273.34		329.50	232.13			Peak HP = 354.1 @ 5750 rpm
3800	389.00	281.45		332.90	240.86			Est Flywheel HP = 416 (assuming 15% drivetrain loss)
3900	389.50	289.23		336.09	249.57			Est Flywheel HP = 443 (assuming 20% drivetrain loss)
4000	390.00	297.03		339.28	258.40
4100	390.50	304.85		341.46	266.56
4200	391.00	312.68		343.63	274.80
4300	392.00	320.94		345.68	283.02
4400	393.00	329.25		347.59	291.20
4500	395.00	338.44		349.50	299.46			Old TQ Peak = 349.50 @ 4500 (w/385 LT1)
4600	397.00	347.72		349.24	305.88
4700	399.00	357.06		348.99	312.31
4800	400.00	365.58		348.04	318.09
4900	401.00	374.12		346.42	323.20			New TQ Peak (w/391 LT4)
5000	400.00	380.81		344.79	328.25
5100	398.00	386.48		342.29	332.38
5200	396.00	392.08		339.80	336.44
5300	394.00	397.60		337.19	340.27
5400	391.00	402.02		334.35	343.77
5500	387.00	405.27		331.75	347.42
5600	382.00	407.31		328.36	350.12
5700	378.00	410.24		324.98	352.70			Old HP Peak = 352.70 @ 5700 (w/385 LT1)
5800	374.00	413.02		318.81	352.08
5900	368.00	413.40		314.75	353.58
6000	363.50	415.27		308.51	352.45
6100	357.50	415.22		300.10	348.55
6200	353.00	416.72
6300	350.00	419.84						New HP Peak (w/391 LT4)