colews6

iTrader: (1)

got a set of prc 2.5 5.3 heads and noticed some rough cast spots in the runners and chambers. i figure this is with all factory cast heads the prc, patriot, livernois etc. so should i get them polished? and will it help get the full potential out of the heads.

Paint_It_Black

iTrader: (1)

No, you don't want a mirror finish in the ports. Combustion chamber, yes, ports, no.. leave the CNC track lines alone.

These are not "as-cast" heads, they are ported factory castings.

88ls1blazer

iTrader: (1)

I wouldn't touch the chamber personally even. What you might gain in flow/efficiency you will lose in loss of compression

AaronR

iTrader: (8)

They dont need to be polished just to make them smooth.However,there is certainly room for improvement in the hands of a good porter.

colews6

iTrader: (1)

well i figure i wouldn't get a mirror finish on the intake, i still want the fuel to mix good before entering the cylinder, but see the rough cast spots smoothed down because it is rough. the exhaust ports and combustion chambers i would like a mirror finish so there's less chance of carbon build up and better exhaust flow.

Jason 98 TA

iTrader: (4)

If you mess with the heads you have to be really careful. It's really easy to accidentally mess the valve job or the cylinder head itself up & not even realize it. We use a very small step over on the new PRC heads so hand polishing the ports will make little to no difference IMHO.