mance cylinder head rebuilding for import & domestic heads. High performance head porting, polishing, rebuilding
 
Performance cylinder head rebuilding for Harley Davidson heads. High performance head porting, polishing, rebuilding
 


 

 

 

 

 

 

 

 


Please check out our flow chart below

Harley Davidson
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!
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.

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.

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.

* 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


This photo of Floyd Lane was taken as the front end was coming back down!

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."

 
Twin Cam Head Flow Characteristics
 
Unported Stock twin cam head
186.2 cfm
Louthan ported stock twin with 1.90 intake
220.4 cfm
Louthan ported stock twin with 1.94 intake
226.7 cfm
Unported Screamin Eagle twin cam
218.8 cfm
Louthan ported Screamin Eagle twin cam
247.6 cfm
Branch ported stock twin with 1.94 intake
221.9 cfm
 
.500 valve lift CFM at 28 inches
 

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!

Fast, friendly service.

Turn around time is usually only 4-5 days!

CALL (971) 720-9192

Please ship to:
Louthan Competition LLC
3728 La Branch St SE
Salem, OR 97317
please figure $25.00 for return shipping and handling

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 **

surface or mill
for compression
machine for compression
release valves
custom porting and
flow testing
the highest quality
aftermarket parts available
unsurpassed quality
in workmanship

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LOUTHAN COMPETITION LLC 3728 La Branch St SE Salem, Oregon 97317 (971) 720-9192 ALL RIGHTS RESERVED 2016