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Message: [QUOTE="gnxtc2, post: 846257, member: 1414"] I did some valve spring calculating before I do my swap. I have Comp 910 sitting in the box. Specs- 92lb @ 1.850 300lb @ 1.350 coil bind - 1.280 (1.330 max lift with .050 safety margin) Factory specs for valve springs: 71-79lb @ 1.833 225-249 @ 1.352 Gives us a total lift of .481 The stock cam lobe lift is .253 on both Intake and Exhaust So to get rocker arm ratio - .481/.253 = 1.90 rocker ratio (If I did it right) So we can agree that max lift in the 7.3 is .481? After countless hours of search on PSA and PSN, most are installing the 910springs in 1.750 - 1.780 range. 1.750 - .481 = 1.269 (past coil bind) 1.780 - .481 = 1.299 (not coil bind but not within .050 for coil bind) By my calculations, the Comp 910 are at coil bind unless installed at factory spec or at 1.811. 99lb @ 1.833 107lb @ 1.811 Someone please correct me if I calculated this stuff wrong. Thanks Billy T. [email]gnxtc2@aol.com[/email] [/QUOTE]

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