Legality of crank swaps

[Z3_GoCar]

So, this is the applicable section:


2. The crankshaft shall be a stock OEM part or

an aftermarket part

as long as it is of identical dimensions and material as the OEM
part for the specific engine. The crankshaft may be

balanced.

The

maximum weight reduction allowance for balancing of the

crankshaft is 0.5 lbs. The

maximum weight reduction allowance

for the balancing of the reciprocating assembly is 15 grams.
Alternate connecting rods are permitted

, but must be ferrous
unless OEM supplied.

Part of the exercise is to get a better oe intake manifold, part is to keep the weight down. Dimensionally, my 84mm crank is the same as the 75mm crank except for the stoke. My rods are shorter than the 75mm crank, so I could also swap those out for a matching set. Also, head's the same casting.

Oh, one more twist. Does the intake manifold match the head or the crank? See I could use a newer generation 75mm crankshaft, but my head matches the older generation intake manifold.