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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 425hp87chevy on November 12, 2011, 07:49:00 pm
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hello, I've searched and cant find what I'm looking for. i am considering swap my 85 k20 to a 5.3 and maybe adding a little boost. but not familiar at all with these newer engines. I'm wondering if the bell housing pattern matches the old pattern of the th350 n 400. just trying to figure what all I'm going to be getting into.
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The trans will bolt up minus one bolt. You need either a flywheel from a 1998 LS1 or an aftermarket one, and a converter for a LS1. Adding an overdrive is better and the one behind the donor is ideal. The NP241 off a 89-91 should bolt up and give you the correct side drop.