I am building a 1966 427(425hp) Corvette, I need to know what the factory lift and duration is for the cam shaft?
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Re: 427 Cam Shaft
L-72 CAMSHAFT
Part number 3863143 and 3904362
Lift data from Chevrolet drawing numbers 3863144 and 3904366
Tappet lift, inches, measured from point of maximum lift in cam degrees
OE indexing points of maximum lift: Inlet 108 deg. ATDC, exhaust 120 deg. BTDC (see notes)
INLET AND EXHAUST LOBE
OPENING
Angle Lift Velocity Acc. x 10 Jerk x 100
0 0.30572 0.000000 -0.001800 0.000000
1 0.30563 0.000180 -0.001800 0.000000
2 0.30536 0.000360 -0.001800 0.000000
3 0.30491 0.000540 -0.001800 0.000000
4 0.30428 0.000720 -0.001800 -0.000125
5 0.30347 0.000900 -0.001775 -0.000375
6 0.30248 0.001075 -0.001725 -0.000375
7 0.30132 0.001245 -0.001700 -0.000125
8 0.29999 0.001415 -0.001700 0.000000
9 0.29849 0.001585 -0.001700 0.000000
10 0.29682 0.001755 -0.001700 0.000000
11 0.29498 0.001925 -0.001700 0.000000
12 0.29297 0.002095 -0.001700 0.000000
13 0.29079 0.002265 -0.001700 0.000000
14 0.28844 0.002435 -0.001700 0.000000
15 0.28592 0.002605 -0.001700 0.000000
16 0.28323 0.002775 -0.001700 0.000000
17 0.28037 0.002945 -0.001700 -0.000125
18 0.27734 0.003115 -0.001675 -0.000375
19 0.27414 0.003280 -0.001625 -0.000375
20 0.27078 0.003440 -0.001600 -0.000125
21 0.26726 0.003600 -0.001600 0.000000
22 0.26358 0.003760 -0.001600 -0.000125
23 0.25974 0.003920 -0.001575 -0.000375
24 0.25574 0.004075 -0.001525 -0.000375
25 0.25159 0.004225 -0.001500 -0.000125
26 0.24729 0.004375 -0.001500 -0.000125
27 0.24284 0.004525 -0.001475 -0.000375
28 0.23824 0.004670 -0.001425 -0.000375
29 0.23350 0.004810 -0.001400 -0.000125
30 0.22862 0.004950 -0.001400 -0.000125
31 0.22360 0.005090 -0.001375 -0.000375
32 0.21844 0.005225 -0.001325 -0.000375
33 0.21315 0.005355 -0.001300 -0.000250
34 0.20773 0.005485 -0.001275 -0.000375
35 0.20218 0.005610 -0.001225 -0.000375
36 0.19651 0.005730 -0.001200 -0.000250
37 0.19072 0.005850 -0.001175 -0.000500
38 0.18481 0.005965 -0.001100 -0.000875
39 0.17879 0.006070 -0.001000 -0.001000
40 0.17267 0.006165 -0.000900 -0.001000
41 0.16646 0.006250 -0.000800 -0.001000
Angle Lift Velocity Acc. x 10 Jerk x 100
42 0.16017 0.006325 -0.000700 -0.001000
43 0.15381 0.006390 -0.000600 -0.001000
44 0.14739 0.006445 -0.000500 -0.001125
45 0.14092 0.006490 -0.000375 -0.001500
46 0.13441 0.006520 -0.000200 -0.001875
47 0.12788 0.006530 0.000000 -0.002000
48 0.12135 0.006520 0.000200 -0.002000
49 0.11484 0.006490 0.000400 -0.002000
50 0.10837 0.006440 0.000600 -0.002000
51 0.10196 0.006370 0.000800 -0.002000
52 0.09563 0.006280 0.001000 -0.002000
53 0.08940 0.006170 0.001200 -0.002000
54 0.08329 0.006040 0.001400 -0.002125
55 0.07732 0.005890 0.001625 -0.002500
56 0.07151 0.005715 0.001900 -0.002875
57 0.06589 0.005510 0.002200 -0.003000
58 0.06049 0.005275 0.002500 -0.003000
59 0.05534 0.005010 0.002800 -0.002750
60 0.05047 0.004715 0.003050 -0.001875
61 0.04591 0.004400 0.003175 -0.000750
62 0.04167 0.004080 0.003200 -0.000125
63 0.03775 0.003760 0.003200 0.000000
64 0.03415 0.003440 0.003200 0.000000
65 0.03087 0.003120 0.003200 0.000000
66 0.02791 0.002800 0.003200 0.000000
67 0.02527 0.002480 0.003200 0.000125
68 0.02295 0.002160 0.003175 0.000625
69 0.02095 0.001845 0.003075 0.001500
70 0.01926 0.001545 0.002875 0.002625
71 0.01786 0.001270 0.002550 0.003875
72 0.01672 0.001035 0.002100 0.004625
73 0.01579 0.000850 0.001625 0.004375
74 0.01502 0.000710 0.001225 0.003625
75 0.01437 0.000605 0.000900 0.003000
76 0.01381 0.000530 0.000625 0.002375
77 0.01331 0.000480 0.000425 0.001625
78 0.01285 0.000445 0.000300 0.001125
79 0.01242 0.000420 0.000200 0.001000
80 0.01201 0.000405 0.000100 0.000875
81 0.01161 0.000400 0.000025 0.000500
82 0.01121 0.000400 0.000000 0.000125
83 0.01081 0.000400 0.000000 0.000000
84 0.01041 0.000400 0.000000 0.000000
85 0.01001 0.000400 0.000000 0.000000
86 0.00961 0.000400 0.000000 0.000000
87 0.00921 0.000400 0.000000 0.000000
88 0.00881 0.000400 0.000000 0.000000
89 0.00841 0.000400 0.000000 0.000000
90 0.00801 0.000400 0.000000 0.000000
91 0.00761 0.000400 0.000000 0.000000
92 0.00721 0.000400 0.000000 0.000000
93 0.00681 0.000400 0.000000 0.000000
Angle Lift Velocity Acc. x 10 Jerk x 100
94 0.00641 0.000400 0.000000 0.000000
95 0.00601 0.000400 0.000000 0.000000
96 0.00561 0.000400 0.000000 0.000000
97 0.00521 0.000400 0.000000 0.000000
98 0.00481 0.000400 0.000000 0.000000
99 0.00441 0.000400 0.000000 0.000000
100 0.00401 0.000400 0.000000 0.000000
101 0.00361 0.000400 0.000000 0.000000
102 0.00321 0.000400 0.000000 -0.000125
103 0.00281 0.000400 0.000025 -0.000500
104 0.00241 0.000395 0.000100 -0.000875
105 0.00202 0.000380 0.000200 -0.001125
106 0.00165 0.000355 0.000325 -0.001250
107 0.00131 0.000315 0.000450 -0.000750
108 0.00102 0.000265 0.000475 0.000250
109 0.00078 0.000220 0.000400 0.000750
110 0.00058 0.000185 0.000325 0.000500
111 0.00041 0.000155 0.000300 0.000125
112 0.00027 0.000125 0.000300 0.000000
113 0.00016 0.000095 0.000300 0.000000
114 0.00008 0.000065 0.000300 0.000250
115 0.00003 0.000035 0.000250 0.000750
116 0.00001 0.000015 0.000150 0.000875
117 0.00000 0.000005 0.000075 0.000625
118 0.00000 0.000000 0.000025 0.000375
119 0.00000 0.000000 0.000000 0.000125
120 0.00000 0.000000 0.000000 0.000000
CLOSING
Lift Velocity Acc. x 10 Jerk x 100
0.000000 -0.001800 0.000000
-0.000180 -0.001800 0.000000
-0.000360 -0.001800 0.000000
-0.000540 -0.001800 0.000000
-0.000720 -0.001800 0.000125
-0.000900 -0.001775 0.000375
SAME -0.001075 -0.001725 0.000375
-0.001245 -0.001700 0.000125
-0.001415 -0.001700 0.000000
-0.001585 -0.001700 0.000000
-0.001755 -0.001700 0.000000
-0.001925 -0.001700 0.000000
-0.002095 -0.001700 0.000000
-0.002265 -0.001700 0.000000
-0.002435 -0.001700 0.000000
-0.002605 -0.001700 0.000000
-0.002775 -0.001700 0.000000
-0.002945 -0.001700 0.000125
-0.003115 -0.001675 0.000375
AS -0.003280 -0.001625 0.000375
-0.003440 -0.001600 0.000125
-0.003600 -0.001600 0.000000
-0.003760 -0.001600 0.000125
-0.003920 -0.001575 0.000375
-0.004075 -0.001525 0.000375
-0.004225 -0.001500 0.000125
-0.004375 -0.001500 0.000125
-0.004525 -0.001475 0.000375
-0.004670 -0.001425 0.000375
-0.004810 -0.001400 0.000125
-0.004950 -0.001400 0.000125
-0.005090 -0.001375 0.000375
-0.005225 -0.001325 0.000375
OPENING -0.005355 -0.001300 0.000250
-0.005485 -0.001275 0.000375
-0.005610 -0.001225 0.000375
-0.005730 -0.001200 0.000250
-0.005850 -0.001175 0.000500
-0.005965 -0.001100 0.000875
-0.006070 -0.001000 0.001000
-0.006165 -0.000900 0.001000
-0.006250 -0.000800 0.001000
Lift Velocity Acc. x 10 Jerk x 100
0.16017 -0.006325 -0.000700 0.001125
0.15381 -0.006390 -0.000575 0.001500
0.14739 -0.006440 -0.000400 0.001875
0.14093 -0.006470 -0.000200 0.002000
0.13445 -0.006480 0.000000 0.002000
0.12797 -0.006470 0.000200 0.002000
0.12151 -0.006440 0.000400 0.002000
0.11509 -0.006390 0.000600 0.002125
0.10873 -0.006320 0.000825 0.002500
0.10245 -0.006225 0.001100 0.002875
0.09628 -0.006100 0.001400 0.003000
0.09025 -0.005945 0.001700 0.003000
0.08439 -0.005760 0.002000 0.002875
0.07873 -0.005545 0.002275 0.002375
0.07330 -0.005305 0.002475 0.001500
0.06812 -0.005050 0.002575 0.000625
0.06320 -0.004790 0.002600 0.000125
0.05854 -0.004530 0.002600 0.000000
0.05414 -0.004270 0.002600 0.000000
0.05000 -0.004010 0.002600 0.000000
0.04612 -0.003750 0.002600 0.000000
0.04250 -0.003490 0.002600 0.000000
0.03914 -0.003230 0.002600 0.000000
0.03604 -0.002970 0.002600 0.000000
0.03320 -0.002710 0.002600 -0.000125
0.03062 -0.002450 0.002575 -0.000500
0.02830 -0.002195 0.002500 -0.001000
0.02623 -0.001950 0.002375 -0.001500
0.02440 -0.001720 0.002200 -0.001875
0.02279 -0.001510 0.002000 -0.002000
0.02138 -0.001320 0.001800 -0.002000
0.02015 -0.001150 0.001600 -0.002125
0.01908 -0.001000 0.001375 -0.002375
0.01815 -0.000875 0.001125 -0.002375
0.01733 -0.000775 0.000900 -0.002125
0.01660 -0.000695 0.000700 -0.001875
0.01594 -0.000635 0.000525 -0.001375
0.01533 -0.000590 0.000425 -0.000750
0.01476 -0.000550 0.000375 -0.000500
0.01423 -0.000515 0.000325 -0.000375
0.01373 -0.000485 0.000300 -0.000250
0.01326 -0.000455 0.000275 -0.000375
0.01282 -0.000430 0.000225 -0.000375
0.01240 -0.000410 0.000200 -0.000250
0.01200 -0.000390 0.000175 -0.000375
0.01162 -0.000375 0.000125 -0.000375
0.01125 -0.000365 0.000100 -0.000125
0.01089 -0.000355 0.000100 -0.000125
0.01054 -0.000345 0.000075 -0.000375
0.01020 -0.000340 0.000025 -0.000375
0.00986 -0.000340 0.000000 -0.000125
0.00952 -0.000340 0.000000 0.000000
Lift Velocity Acc. x 10 Jerk x 100
0.00918 -0.000340 0.000000 0.000000
0.00884 -0.000340 0.000000 0.000000
0.00850 -0.000340 0.000000 0.000000
0.00816 -0.000340 0.000000 0.000000
0.00782 -0.000340 0.000000 0.000000
0.00748 -0.000340 0.000000 0.000000
0.00714 -0.000340 0.000000 0.000000
0.00680 -0.000340 0.000000 0.000000
0.00646 -0.000340 0.000000 0.000000
0.00612 -0.000340 0.000000 0.000000
0.00578 -0.000340 0.000000 0.000000
0.00544 -0.000340 0.000000 0.000000
0.00510 -0.000340 0.000000 0.000000
0.00476 -0.000340 0.000000 0.000000
0.00442 -0.000340 0.000000 0.000000
0.00408 -0.000340 0.000000 0.000000
0.00374 -0.000340 0.000000 0.000000
0.00340 -0.000340 0.000000 0.000000
0.00306 -0.000340 0.000000 0.000000
0.00272 -0.000340 0.000000 0.000000
0.00238 -0.000340 0.000000 0.000125
0.00204 -0.000340 0.000025 0.000625
0.00170 -0.000335 0.000125 0.001125
0.00137 -0.000315 0.000250 0.001125
0.00107 -0.000285 0.000350 0.001000
0.00080 -0.000245 0.000450 0.000625
0.00058 -0.000195 0.000475 -0.000250
0.00041 -0.000150 0.000400 -0.000750
0.00028 -0.000115 0.000325 -0.000625
0.00018 -0.000085 0.000275 -0.000500
0.00011 -0.000060 0.000225 -0.000500
0.00006 -0.000040 0.000175 -0.000500
0.00003 -0.000025 0.000125 -0.000375
0.00001 -0.000015 0.000100 -0.000250
0.00000 -0.000005 0.000075 -0.000375
0.00000 0.000000 0.000025 -0.000375
0.00000 0.000000 0.000000 -0.000125
0.00000 0.000000 0.000000 0.000000
BASE CIRCLE
Radius = .63857/.64057
NOTES:
1. Inlet and exhaust lobes are identical and asymmetrical
2. 3863143 has a groove in the rear journal, 3904362 does not; camshafts are otherwise identical
3. Lobe also used on LT-1 cam inlet side on a base circle radius of .59874/.60074,
point of maximum lift, 110 deg. ATDC -
duke he ask what time it was
not how to build a clock.Comment
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Re: 427 Cam Shaft
Thanks for all the information, but I still didn't get the lift and duration that I was looking for. I can't work cross-word puzzles If I were going to buy an aftermarket cam the the 427(425hp) what is the closest one that I could get to the GM specs?Comment
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Re: 427 Cam Shaft
The answers to your questions are in the data I provided. The cam is available from F-M Speed Pro.
DukeComment
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Re: 427 Cam Shaft
i would go with GM 12364057 cam and kit. it is the 3863143 camshaft made by crane for GMComment
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Re: 427 Cam Shaft
Keith,
Clem is on the money, as usual. His suggestion to go with the GM/Crane cam would be my first choice. They make a dead on copy of the original 3863143 425 HP GM cam and their quality has always been excellent.
As far as lift/duration etc numbers, I can post these for you but those numbers really are meaningless to 98% of the world. The numbers are in Dukes post above if you study the page but you still won't know any more than you did before you read it. The 143 cam is an excellent choice for all solid lifter street applications.
MichaelComment
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Re: 427 Cam Shaft
Please refrish my memory I must be getting old. Did the 66 427 need the oil groove on the back camshaft journal like the 65 396?Comment
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Re: 427 Cam Shaft
You are correct Bill. The original desigh for both 65 and 66 BB engines had the grooved cam journal instead of the 67 and later grooved bearing.
Most engine rebuilders today install the grooved bearing for all BB engines including the 65-66 breed, even if it does have a grooved cam journal. It's ok to have both the cam journal and the bearing grooved but not ok to have no groove at all.Comment
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Re: 427 Cam Shaft
if the rear cam bearing has 3 holes you need a grooved rear cam bearing journal,3/16" wide and 3/16" deep. the groove is to feed the lifter gallery. after doing this in the small block in the early days why would they repeat the same mistake with the big block???Comment
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Re: 427 Cam Shaft
"The numbers are in Duke's post above if you study the page but you still won't know any more than you did before you read it."
Sure you will. You'll know the complete dynamic characteristics of the L-72 cam.
DukeComment
Comment