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Back Ducati Competition Cylinder Head Prep & Prices
Colsibro Race Guides
A
reliable cylinder head should have freshly cut well defined seat angles
being cut concentric to its guide bore enabling good sealing without the
contact area being too thin. A thin contact area may be great on a race engine that’s stripped every few meetings and it may
gain a few extra cubic feet per minute of airflow on paper but its not
good for RELIABILITY or your wallet. At CJS we gain airflow in
other more thoughtful ways.
Valve guides are
seriously important; they must be wear resistant, be sized and
honed correctly for oil retentive properties and have an aero dynamic
profile for improved airflow. CJS designed COLSIBRO BULLET NOSED RACE
GUIDES attain this in every way. These guides are flawless and totally
finish off your porting job by making it look crisp and professional. However gas flowing is not about looks but who wants their expensive
Ducati heads back looking like they have been attacked by a knife and
fork and at £88
a set who can refuse the benefits of above.
On
every port job over the level of a stage 1 CJS may refuse the work
unless colsibro guides are fitted due to all the reliability
reasons stated above.
All Ducati 4v Heads Incl Testastretta
749s
STAGE 1
£300 plus colsibro race guides/stem
seals if needed or required.
You get your heads
thoroughly cleaned, re-shaped intake and exhaust ports, valve
seats machined to competition profiles, matched manifolds, polished
and modified combustion chambers and valves. Valve guides if in
good condition can be left in place or trimmed flush into the port but
only depending on valve size, intended use and camshaft lift. All
heads will be returned thoroughly cleaned ready for you to assemble.
998-999 Stage III
STAGE 2 £350
plus valves/colsibro race guides and stem seals if needed or required
You get all of the
above from stage 1 but with oversize valves. Stage 2 heads can be
reworked for original engine character or for use with race cams.
998 - 999 Stage III
STAGE 3 Ultimate 998/999 - You get a
cylinder head re- worked for high velocity air speed. with either your
original valves or CJS developed high flowing 42mm stainless 1 piece
items. This type of porting gives very big midrange power. Click here
for a dynograph of a 999 fitted with one of these heads!
Price using your
original valves £350
plus colsibro race guides/stem seals if needed or required
Price using large
CJS valves £400
plus valves colsibro race guides and stem seals if needed or
required
If you require your
heads to be fully stripped, inspected, shimmed and re-assembled
ready to bolt on after gas flowing add
£120 plus
parts.
All Ducati 2 Valve Heads
STAGE 1
£250 plus
colsibro race guides and stem seals if required or needed.
STAGE 2
£300 plus
valves/colsibro race guides and stem seals if required or needed.
If you require your
2v heads to be fully stripped, inspected, shimmed and re-assembled
ready to bolt on after gas flowing add £120
plus parts.
Cylinder Head
Parts & Prices
Set of 42mm
oversize valves for 998/999 stage 2 £160
Set of 37/31mm or
38/32 intake and exhaust valves for 996 stage 2
£280
Set of 40mm flat
nail intake valves for 998/999 £140
Set of 33mm exhaust
valves for 998/999 £140
a set
All other CJS
oversize valves £35
each. Many sizes available.
Colsibro race guides
all 4v Ducati
£88 a full set
Colsibro race guides
all 2v £44
a full set,
Stem seals are now
at an aftermarket rate or
£4 each
You are welcome to
supply all your own parts for us to fit as long as we believe
they are up to the job in hand and not at a second hand standard.
