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does anyone know if aftermarket ls1 injectors will work on an lt1 thanks

OBE1 95Z28

Yes, physically they're the same size; you'll need to check their flow rating for your application.

Injuneer

The important thing to know is that an LS1 fuel system operates at 4bar (58psi), and the stock LS1 injectors are flow rated at that pressure. Hence, a stock 28#/HR LS1 injector running in an LT1 fuel system operating at 3bar (43.5psi) will only flow 24#/HR.

If they are aftermarket injectors, you have to ask the manufacturer what pressure they are flow rated at, to see how they would perform in your LT1 fuel system.