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1970 521 Build


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I did some initial reassembly and the box is binding pretty bad. Lots of crunchy noises in there even with spray grease just for testing. I took it back apart and stuck the box itself in our parts washer. I rewatched BlueHands video on this and think I am going to spend more time on this Saturday when I can be in the shop undisturbed. I know the whole assembly was abused over the years, I just hope it isn't too damaged invisibly to be any good. We shall see.

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There are good things about this L20b and there are things I need to address. Overall it is not a terrible start but there are changes I want to make. Mostly the 'hot plate' exhaust manifold and related. I'd love to switch to side drafts but one step at a time. It ran with fuel in the bowl but that was once and I guarantee the only time it has run since being set on the frame. It may have been gone through...it might be stock. I have no way of telling without taking it apart. Either way, here's the L20b and pardon my ignorance, I don't know these like I do the KA24e.

 

 

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The '78-'80 cars and truck L20Bs had the separated intake/exhaust and your down pipe should fit this. I also had the co-joined manifolds and put a '79 truck intake on but at the same time switched to the 4 into 2 L16 cast iron exhaust. This is more involved as you need the twin  down pipe.

 

Additionally the U67 head needs two 3/8" holes drilled to let coolant into the runners. The outlet from the runners exits the intake near the front base of the carburetor and has to be piped to the thermostat by pass hose. This can be recovered from the  L20B you get the manifolds from. or make something up.

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