I went to look for information on this. Here is what was on Donovan's site:
1984-1987 Turbo I/II PN: 4293819 .430 Lift 240-240 Duration 1988 Turbo I/II PN: 4387850 .430 Lift 236-232 Duration 1989-1992 Turbo I/II PN: 4387721 .430 Lift 228-228 Duration There are 6 cam sprockets for the SOHC 2.2/2.5 family 1984-1988 "4201974" Square tooth 2.2 Turbo, 2.2 N/A 1984-1987 "4201992" Square tooth hi-output 2.2 N/A 1989-1992 "4387557" Round tooth 2.2/2.5 Turbo, 2.2 N/A 1989-1993 "4448690" Round tooth 2.5 N/A "common block" 1986-1987 "4273238" Square tooth, "tall deck" 2.5 TBI ONLY 1988 ......... "4387535" Round tooth, "tall deck" 2.5 TBI ONLY Shelby retarded the camshaft 4 degrees in the carburated Shelby Chargers with a special cam sprocket to make more high rpm hp So the cam did change between 88 and 89, so they could have different centerlines. If it lost power at higher RPM, it would indicate that the cam needs to be retarded. So the 89 sprocket seems to have 4 degrees retard over the square tooth sprocket. Either use the 4 degree offset key to retard the cam, or swap back to the slider. I wonder what the 89 2.5 TBI sprocket is? whats the difference between that and the 2.2 TBI/turbo sprocket is? Maybe a square tooth tall deck 2.5 would work? I want to round these things up, and see what they come in at. Could make things eiseir for someone needing to change cam timing. Joey Dalton Hillbilly Racing 86 Turbo Z C/S T Tops DC intercooled 87 Shelby Z parts car =( T Tops, Fred Flinstone floors, broken rad support and cracked front subframe. 88 Shelby Z Pacifica/lebaron interior, 3.85 FD a523 with HR short throw shifter, TAFT S2 cam, 20 PSI, Hillbilly exahust 88 Chrysler Shelby Z T tops 89 Daytona C/S compitition 66 Dodge Charger 76 Dodge D 100 318/auto 51 Studebaker Champion 4 door future father/son project, will be 355 EFI HEMI -----------------------REMOVE-FOOTER-WHEN-REPLYING---------------------------- Questions? Visit http://www.sdml.org/ To be removed, visit http://www.sdml.org/pages/leave.html
