1985 XL350R

I have an 1985 XL350R that had a valve head come off in the cylinder causing catastrophic damage. I was able to locate a 1984 XL350R parts bike for $250 and was wondering if the motor is the same? Is it basically a straight swap if I want to keep the existing crankcase and throw the new motor on top?

I have an 1985 XL350R that had a valve head come off in the cylinder causing catastrophic damage. I was able to locate a 1984 XL350R parts bike for $250 and was wondering if the motor is the same? Is it basically a straight swap if I want to keep the existing crankcase and throw the new motor on top?

I think so but can't swear to it. THe 85 XR is completely different than 84, wet sump versus dry, but don't think the XL had the same change. 

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