273 said

Here's a mild cr 9.2:1 383 where they go from stock to decently hopped up.

At 3000 rpm (buddies stall) goes from stock 383 lbs-ft to fairly health cam 394 lbs-ft.

"We were eager to try one of the new Comp grinds, and ordered up an XE285HL-10. This is a fairly serious hydraulic profile, rated at 285/297 degrees gross duration and spec'ing out at 241/247 degrees duration at .050 inches, with .545/.545-inch lift on a 110-degree lobe separation."

How much less of cr are we talking about 8.2, 8.5 less than 8 ?

https://www.motortrend.com/articles/mopp-0209-upgrading-the-383-magnum-avs-carb/

Torque
RPM	STK	HDRS	CARB	INTKE	CAM
3000	382.7	406.3	427.1	405.5	394.2
3200	388.1	406.6	422.6	410.9	400.0
3400	388.3	412.6	431.9	421.2	414.7
3600	394.6	411.2	433.7	426.1	431.5
3800	392.4	408.3	430.8	430.0	435.5
4000	387.2	401.3	424.6	433.0	446.5
4200	377.8	396.2	416.4	430.1	451.5
4400	371.4	390.2	409.7	430.1	451.8
4600	367.8	384.6	402.0	427.8	454.2
4800	361.6	379.5	398.5	424.3	456.6
5000	355.1	373.4	385.6	421.3	450.3
5200	337.2	357.8	368.1	407.7	449.1
5400	322.8	348.5	351.4	395.1	435.8
5600		417.0
5800	407.6
6000	398.2

Horsepower
RPM	STK	HDRS	CARB	INTKE	CAM
3000	218.6	232.1	244.0	231.6	225.2
3200	236.5	247.7	257.5	250.3	243.7
3400	251.4	267.1	279.6	272.7	268.5
3600	270.5	281.9	297.3	292.1	295.8
3800	283.9	295.4	311.7	311.1	315.1
4000	294.9	305.6	323.4	329.8	340.0
4200	302.1	316.8	333.0	343.9	361.1
4400	311.1	326.9	343.2	360.4	378.5
4600	322.2	336.8	352.1	374.7	397.8
4800	330.5	346.8	364.2	387.8	417.3
5000	338.0	355.5	367.1	401.1	428.7
5200	333.9	354.2	364.5	403.7	444.6
5400	331.9	358.3	361.3	406.3	448.1
5600		444.6
5800	450.1
6000	454.9

Click to expand...