air gap rpm to box stock SCJs. They are going on a 10.2:1, 521, custom hydro flat tappet for a sterndrive boat. Should i match the ports, D shape them(like I have read to do for a victor), or leave them alone??
LMAO!....aaah, a man after my own heart!Generally when dealing with standard port style heads, I don't think there's much benefit, but the mismatch from an intake with standard ports to the SCJ/P-51 heads is significant. Hold up a CJ gasket to the ports of the intake and you'll probably find yourself covered in aluminum chips.
Not so sure I would agree that port matching is always better then not port matching. I think it depends on the combo and the intended application....or what one defines as "port matching," I suppose.
There are cases where cutting on an otherwise good port to make it match can reduce flow.
Like Cutaway said, nothing says all gaskets will match each other.There are cases where cutting on an otherwise good port to make it match can reduce flow.
It is common practice to use the gasket as a template for matching. While that is handy, there is nothing sacred about the size, shape, and location of the port openings in the gasket.