The subject says it all i want to put an l20 in my 1600 and want to know what is involved?

take old motor out, bolt new motor in.. it's literally that simple

if the L20 is from a Bluebird you'll need to put he L16 sump onto the L20 motor as the oil pan sits in a different spot to clear the crossmember

as I found out with my 180b when I put a L20 in it, the exhaust manifold won't join to your exhaust pipe as well as it used to - massive exhaust leak that no amount of RTV silicone could fix (answer: extractors!)

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1985 Bluebird TRX SR20DET
1988 GQ Patrol Ute locked and lifted
http://www.910bluebird.com

Might also need to muck around a bit with the throttle linkage. The bracket on the firewall behind the carbie needs to be raised up about 20mm.

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1971 Datsun P510 SR20DET 276 rwkW
2005 Mercedes AMG E55 350 kW
1969 Datsun P510 L20B EFI 95 rwkW
1975 Ford XB Fairmont GS Wagon 179rwhp
1980 Escort Van SR20DET unfinished
2002 Suzuki GSX1300R Hayabusa 185hp

When swapping sumps, you should also swap the oil pickup in the sump.

You may also find the dipstick is in the wrong place with the new sump.

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1970 ex Group A Rally P510
1971 P510
1972 180B SSS
1965 SP310 Fairlady
1966 SP311 Fairlady