hey. ive just obtained an l20b motor that i want to put into my 1600. would anyone know which parts have to be changed to fit it into the 510?

Use the sump and oil pickup off the 1600 motor.

Only other potential problem is that your exhaust may hit the underside of the car, as the L20B is a bit taller than an L16 thus raising the exhaust manifold and exhaust as well. Will depend on what exhaust you have on the car.

If you're really fussy, you can alter where the throttle linkage bolts onto the firewall as the inlet manifold / carbs will be higher for the same reason, although I've gotten away without doing so in the past.

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

the bit everyone neglects to mention when they talk about swapping the sump and pickup, is the dipstick which is also in a diferent location in the blocks! That is a bit more fiddly...

WHAT IF YOU USE THE 1600 DIPSTICK IN THE L20B TUBE? WILL THAT MAKE ANY DIFFERENCE IN COMPENSATING FOR THE L20B SUMP/ AFFECT THE OIL LEVEL READING?

Yep - forgot the dipstick. The engine I used (plus the spare I still have) both had two dipstick tubes .

The one in the correct location for a 1600 was just crimped over on the end. I hacksawed a few mm off, straightened it up and used that dipstick tube with the 1600 dipstick. Just had to remember it read a few mm too much oil

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

what hapens if you press the button in between tab and shift???????? :P