Originally Posted by miata2fast
Do you suggest that we just live with the limitations of the bp, or go and fix them.
My observations: The overall approach of the builds at this site, with some exceptions, is about getting the most power for the money.
The Miata crank is bulletproof, the block is strong, the block to head interface is stout, good rods and pistons are readily available, there are several good options for exhaust manifolds, and the exhaust itself is well sorted. Lots have developed solutions for the intake, from gutting the stock manifold to a full custom unit. ECUs are also taken care of, several flavors to choose from.
So that pretty much just leaves the head. Oversize valves are already available. Springs are already available. VVT is being experimented with. Static cam timing tuning has been done. So that pretty much leaves porting and cam profiles. Head porting and the like are nice, but from what I have seen they are pretty expensive to get done professionally and/or properly. I have seen some play with cams but not many.
Clearly the builder in the linked thread spent an insane amount of money on his motor, and is not running pump gas. I think it is well beyond what most want to do here. For insane power levels, a V8 swap is overall a cheaper and more bulletproof option if one is trying to get above 300-400 RWHP.
So in my mind the above explain why no one is sinking large amounts of cash into head work and/or cam profile experimentation. It is easier and cheaper to build a stout motor and turn up the boost.