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These kits fit LT series and other GM Gen V engines including but not limited to LT1, L86, and L83.
These kits normally clear the cross member on otherwise stock 1965 - 1982 C2 and C3 Corvettes.
That being said, issues such as age, condition, manufacturer, etc. of motor mounts can cause clearance problems. Fortunately, most clearance issues can be solved by putting a spacer between the engine and the motor mount. This was a factory solution for GM on 1966-74 big block Corvettes with air conditioning. The factory style spacers are reproduced and are available from various Corvette suppliers listed below. They are specified for big block, but they will fit Chevy small block engines as well.
1963 - 1964 engines will most likely have to be shimmed upward for the crank pulley to clear the cross member. Make sure you have enough hood clearance!
Part numbers for the engine mount shims:
GM #3910756 (for reference only, no longer available)
Corvette Central #302001, www.corvettecentral.com
Mid America Motorworks #670-199, www.mamotorworks.com
Volunteer Corvette #EN65X, www.volvette.com
Zip Corvette #M-2494, www.zip-corvette.com
