Originally Posted by
DJ_Shakespear
Its not really a custom boost port, just an additional hole in the sleeve to allow the oil in the fuel to reach the bottom/inside of the piston for cooling purposes.
Though it does look like an intake port, who did the mod on that sleeve? Does the 353 come with a hole there originally?
That is a sleeve of a Novarossi Flash.
Yes, the 353 has two small holes in that place.
That modification was done by a close friend of mine.