I was just there but it only mentions removing material from cylinder head and max capacity.
Specifications of Automobiles – Group 2B
Last updated: 01/01/2013
4
© Confederation of Australian Motor Sport Ltd. All use subject to Conditions of Use at
www.camsmanual.com.auGROUP 2B - MARQUE SPORTS CARS
4.
ENGINE
4.1
General:
Engine capacity for reciprocating engines may be varied within the limits of the recognised
or replacement block; save that the maximum permitted capacity of the engine is 6000cc. Save for the
restrictions imposed in Articles 1.4, 4.2, 4.3 and 4.4, the remainder of the engine assembly and associated
systems are free.
4.2
Reciprocating engines:
(i)
The cylinder head/s must be those that were standard for that particular model. The cylinder head/s may be
modified only by the removal of metal.
(ii)
The cylinder block may be replaced by another of the same family of block, which is deemed to be one that:
•
is from the same manufacturer
•
has the same cylinder bore spacing and general configuration.
•
retains the same cylinder head bolt positions.
(iii)
The cylinder block may be modified only by the removal of metal, whilst retaining the original configuration
Doesnt mention cams, piston choice, compression valves etc.
But I gather from this that an NA shell with a VVT engine is totally legit?
Dann