Picture : CVH Cylinder Head
Picture : CVH Cylinder Head
Picture : CVH Cylinder Head Exhaust Port
Picture : CVH Cylinder Head Inlet Port
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NA CVH : Cylinder Heads |
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Although the CVH was produced in several
different capacities all the following information is concerned primarily
with extracting more performance from the 1600 head, of which there are
two main types, the lean burn as found in post 86 carburettored 1600's and
hemi's as found in all other 1600's. On
the lean burn head the valve shrouding issue must be addressed in order to
obtain maximum valve flow. This is achieved by relieving the chamber walls
around the valves by removing material. The
lean burn head is an excellent head because it offers a shorter flame path
over the traditional Hemi head, which can be used to to the tuners
advantage. However with the Lean burn
head it takes skill and know how as well as many hours on the flow bench
and dyno to achieve the best results. This
head features cut back valve guides in addition to the optimised
combustion chamber, and revised porting. Valve seats are initially cut
with 5 angles, blended by hand and then manually lapped in to obtain near
perfect valve seat flow. The valves are optimised using wasted stems on
the inlet side, whilst the exhaust valves use a revised valve head
profile. In addition I make a 30 degree cut behind the 45 degree valve
seat to aid valve flow. Exact specs and seat widths are confidential.
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