Cylinder Head Port & Polish
Porting and polishing of the cylinder heads intake and exhaust
runners, bowl area, short turn area and combustion chamber are
the main keys in cylinder head power. A factory cylinder head
off a common engine is cast, cleaned, assembled with valves,
springs, seals and locks then is assembled onto the automobiles
engine. I take the factory or high performance "Hop Up"
head and port and polish it for maximum power.
Racing Valve Job
A valve job consists of boiling (cleaning) the head(s),checking
the valve guides to see if they are good or need to be replaced.
Replace guides if necessary then the valve seats which are part
of the valve seat ring are cut on a 3 angle or radius (radius
is usually done on the exhaust seat). The valves are then glass
beaded and cut on the proper angle accordingly. The heads main
mating surface is then checked and a clean mill is taken if
necessary. After getting a valve job and/or a porting and polishing
job, the heads are then cleaned again for final assembly. The
heads are then assembled with the stock valves or aftermarket
valves of your liking, stock or aftermarket valve springs, new
seals and your locks and retainers which may be replaced to
your requirements. Also included is checking each installed
height of spring and tension of each valve spring. Going back
to the flow bench results this is were they come in handy. Knowing
were your heads flow It will help you pick out your camshaft
and valve springs. Increasing CFM throughout the heads entire
range of lift is more important than a max flow number. For
instance a head that may flow 325 CFM at .650" lift which
being its most flowing area, may under perform a head that flows
25CFM less at .650" lift but has a higher average CFM through
out the entire range being .000" to .650".
