differences in big port and small port oem cams

[jondee86]

nzae86 Wrote:The figures may be different between the two types of camshaft but maybe
the head differences prevent any gain ?

Quite likely. Toyota will have optimised the cams for each engine. They
would have tested many different profiles before they settled on the the
one that best met their goals for the engine.

Meeting emission standards, and having an engine that worked well with
an auto trans, would have almost certainly been part of the design brief
for the smallport. Because, having lost the "sporty" RWD platform, there
was no longer any need for a "sporty" free-revving engine when the
smallport was being developed.

So yeah, hardly surprising that there is no gain when swapping cams. Bit
like when I put GZE cam covers on my smallport...

Cheers... jondee86