wats the biggest motor i can legally put in A 1983 vh holden commodore coupe?

Question

for nsw rego

Answer 1

You can put in anything your heart desires. If you are going to drive it on the street, you might have to pass an emissions test if your city has laws to that effect.

Answer 2

well as far as legality goes, any motor you can fit as long as you have catytic converters and mufflers that are similar to stock.