The last vicroads regs I read were "no more than a 30% horsepower increase on an engine capacity of 3 litres or less". Over 3 litres (standard donk) you can go a greater hp increase. Cannot recall exact number.
There is a lot of other criteria with it, no chassis mods etc.
Cheers, Mick.
1974 S3 88 Holden 186.
1971 S2A 88
1971 S2A 109 6 cyl. tray back.
1964 S2A 88 "Starfire Four" engine!
1972 S3 88 x 2
1959 S2 88 ARN 111-014
1959 S2 88 ARN 111-556
1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
REMLR 88
1969 BSA Bantam B175
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