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L20B to stock 521 4spd


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save the engine mounts from your l16. First l20 I got was out a 78 510 used the mounts that were on the motor and couldn't close the hood(looked cool without the hood thou)any way the clutch and pressure plate line up just fine and being you are not changing the length of the tranny no drive line work is needed. But it will still rev to about 4200 on the freeway at 65 mph:mad:

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  • 3 weeks later...

You need the correct clutch and throw out bearing collar for a l20b or l16.In a 521 you have to have the 521 specific oil pan.Have to pound it out a bit for the front crank journal on a l20b.Try to find a dogleg for easy 5 speed install.I have never had an issue with the one in my 620 and that is my worker.

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