[Speedbump_]

I have a problem cobra replica registered under the California SB100/Special Vehicle program with a blown engine.

I am unsure if all replacements must be identical to the original components. But a nifty pair of used aluminum heads popped up at ½ the price it would cost me to machine, port, and polish the cast iron heads being replaced.

As yet, (I haven’t finished reading the regulation), I can’t find anything saying it’s a no-no.

ALL INPUT is appreciated.