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Please
check out our flow chart below
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| We have a great selection of cylinder
head components for Harley Davidsons including stainless
and titanium valves, chromoly and titanium retainers,
performance valve springs, re-engineered chromoly
spring seats, fully machined valve locks, and iron
or bronze valve guides. Shop around, we offer the
BEST bang for your buck on Harley heads! |
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For the Evo and Twin Cam heads,
we offer 5 different grades of valves from budget performance
to severe duty. Most are available in stock head diameter
as well as oversize.
Please call or email for price and availability. |
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All of our
Evo and Twin heads get the
same treatment: 1.900 or 1.940 intake valves
respectively, 1.615 exhaust valves, new
performance springs with titanium retainers
and machined locks, a 3-angle valve job
and fully ported and flow tested, your
heads or exchange for $695.00 per
pair.
*
2005 and up, $725.00 per pair.
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| If you're thinking of splurging
for a set of Screamin Eagles, consider
sending them to us for porting. Notice in
the chart below that our ported stock head
actually outflows the unported Screamin Eagle.
In ported form the Screamin Eagle is a superior
head, so if you choose to go that route, we
can re-do the valve job and fully port your
heads for $495.00 per pair if we
don't replace any parts. |
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* In 2005 Harley heads changed to a 7mm
valve stem and a single ovate wire conical spring.
These parts are slightly more expensive than the standard parts
for the earlier heads
Click on thumbnail to view larger image
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This photo of Floyd Lane was taken as the front end was coming
back down!
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Horsepower is directly related
to air flow; the more flow, the more power. This graph illustrates
the contrast between ported and unported heads. The Screamin
Eagles, represented by the red bars, are on the 95 inch
Dyna Wide Glide (see photo directly above) that won his
class in the dyno contest at the Street Vibrations Reno
Run in 2003. It is currently making over 100 h.p. with relatively
low valve lift so it's still very streetable.
The heads represented by the green bar were ported at Jerry
Branch's Flowmetrics and are shown solely for the sake of
comparison.
The Branch name is legendary in the world of high horse
power Harleys and we're honored
to be able to produce a high caliber product with the same
legendary performance." |
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Twin Cam Head Flow Characteristics |
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Unported Stock twin cam head |
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186.2
cfm |
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Louthan ported stock twin with 1.90 intake |
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220.4
cfm |
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Louthan ported stock twin with 1.94 intake |
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226.7
cfm |
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Unported
Screamin Eagle twin cam
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218.8
cfm |
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Louthan ported
Screamin Eagle twin cam
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247.6
cfm |
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Branch ported stock twin with 1.94 intake |
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221.9
cfm |
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.500 valve lift CFM at 28 inches |
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There are shops that are producing slightly higher cfm from
their heads, but they are increasing the intake port volume to get
this extra flow.
When your port volume increases, the velocity of the air / fuel charge
slows down and your low end power decreases.
The flow numbers we've shown above were achieved without dramatically
increasing the volume of the port,
thus increasing the torque output throughout the rpm range including
down low where you need it!
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Fast,
friendly service.
Turn around time is usually
only 4-5 days!
CALL 503.390.8875 |
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Please ship to:
Louthan Competition
6936 Labish Center Rd NE
Salem, OR 97305
please figure $25.00 for
return shipping and handling
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additional services:
** replace and fit valve guides: $15.00 each
**
** Cut heads for higher compression -.005
to .050: $50.00 for the pair **
** Machine
for compression release valves: $100.00 for the pair **
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surface or mill
for compression
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machine for compression
release valves
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custom porting and
flow testing
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the highest quality
aftermarket parts available
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unsurpassed quality
in workmanship
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Performance cylinder head rebuilding for import & domestic heads. High performance head porting, polishing, rebuilding
