Stock Valve Job
** Competition Valve Job
Replace valve guides
Install seats for larger valves
R&R Cams, followers, etc.
* Stage III does not include cost of valves
** Competition valve job is any deviation from stock ie: larger springs, longer valves.
Basic flow improvement - short side radius contoured
and ports polished. The stage I flow improvement will increase
your head's efficiency by approximately 20 cfm @ 28" which
calculates to an approximate 40 H.P. gain.
Basic port job - short side radius contoured and
outer ports widened at choke point. The Stage II port job
will increase your head's efficiency by approximately 30 cfm
@ 28" which calculates to an approximate 60 H.P. gain.
Competition port job - full competition port and
polish complete with larger valves installed *.The stage III
port job will increase your head's efficiency by at least
40 cfm @ 28" which calculates to a gain of at least 80 H.P.