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[ltank]

I have looked at street port dyno sheets and dyno sheets of expensive port jobs and it doesn't appear to be a major gain vs
A lot more money spent. I am referring to the average build not
All out race motors. The average TC 95, 96 and 103 motors rode
daily basis doesn't go to 6,000 RPM every day. Most are ridden
2800 to 4800 RPM

[HD Street Performance]

Your observations are correct. Plus in my experience many folks are sold horsepower when what they really want is a broader higher torque curve, which happens to also yield more horsepower even though that is not the primary focus. Few are drag racing and the extent of their fun are some roll-ons with their buddies. Plus they want a quiet valvetrain and longevity.

The term Street Port gets used loosely with a broad brush however. When the product is looked at more closely the less expensive packages use stock valves and guides and albeit they flow more than stock are very limited. My attitude has been to not dabble. In other words if the heads come off there is an investment of time and money to do that so why not give back a product that performs as expected, offers higher quality parts, and leaves room for growth (within limits) later? Plus not break the bank.

With the late models a bolt-in cam like a SE255 plus a stage 1 is sufficient to fix the torque curve but this is a very short cam and is tapering off quickly at 4k rpm especially in the larger motors. A good tune and pipe is also imperative regardless of the combination. The SE255 operates with high cylinder pressures therefore the tune becomes even more important to avoid heat and engine damage.

[ltank]

I am building a Ultima 100" Fatso motor for my son. The Ultima crank 4.250" Stroke that uses 3.875" 95 Harley cast flat top pistons. The longer stroke raises CCR with .030 gaskets 10:1
Local shop is doing the 2004 heads with Black Diamond valves and S&S Beehive springs. Cam is DME 530 . It has a .530 lift 42 on intake close, 250 duration, 43 overlap, 103.3 LSA. Should have a good valvetrain life, S&S lifters and HP oil pump. Ultima
R2 (Super E with Thunder Jet). I have been doing it over the past two years. R&D Cycle modified the pushrod holes in heads. I can post pics of the assembly after all is done.

[prodrag1320]

our street porting shouldn't be confused with other street porting.our street porting is done differently for each build being used on,with int flow #`s in the low 260`s @ 28".comprable with a lot of "fully ported,expensive" heads

[HILLSIDECYCLE.COM]

I am building a Ultima 100" Fatso motor for my son. The Ultima crank 4.250" Stroke that uses 3.875" 95 Harley cast flat top pistons. The longer stroke raises CCR with .030 gaskets 10:1
Local shop is doing the 2004 heads with Black Diamond valves and S&S Beehive springs. Cam is DME 530 . It has a .530 lift 42 on intake close, 250 duration, 43 overlap, 103.3 LSA. Should have a good valvetrain life, S&S lifters and HP oil pump. Ultima
R2 (Super E with Thunder Jet). I have been doing it over the past two years. R&D Cycle modified the pushrod holes in heads. I can post pics of the assembly after all is done.

We have one of those in here now.
Haven't opened it up yet.
Scott

[ltank]

The one in your shop is broken? It would be nice to know what happened. What to avoid. I have done odd motors in the past.
See my Shovel/ Evo .3 13/16 bore 4.250 stroke.  Dave Mackie
Did the head work, O - ring heads and step bored cases. Billet cylinders bolted without long studs

[wfolarry]

I built a Fatso motor for my bike when Sputhe first came out with the cases. Used jims rods with the TC wrist pin size. As long as you get the intake pushrods located properly you shouldn't have any problems. Ran it for about 5 years. No leaks. No problems. It's just sitting on the shelf now. M

[HILLSIDECYCLE.COM]

The one in your shop is broken? It would be nice to know what happened. What to avoid. I have done odd motors in the past.
See my Shovel/ Evo .3 13/16 bore 4.250 stroke.  Dave Mackie
Did the head work, O - ring heads and step bored cases. Billet cylinders bolted without long studs

Client said it "locked up", but that could very well be something that the builder(?)did.
Doubt that the engine design has much to do with it........just a big-bore Evo, with a T/C head on it.
He's not in a rush so it'll be a bit before we crack that open.
Scott

[wfolarry]

As far as porting goes any head that's ported and not flow tested is just a valve job. Don't waste your money.

[prodrag1320]

100% agree`d

[FlaHeatWave]

From what I've heard, the 110 heads flow pretty good stock.

Went with the T-Man CVO Street Performer Heads on the 117, (not inexpensive!) can't tell you if it made any big difference, since we did everything at the same time (no before / after), all I can say is that everything seems to be playing very well together...

[prodrag1320]

they flow a lot better with work.we`re seeing about 265 @ 28" out of the box,300+ with work

[Ridgerunr]

"everything seems to be playing very well together..."

Crucial.   

[ltank]

I was looking at this Web site and it show a wide variation from porters. It shows stock heads almost as well as ported head in a few instances. Some very close to several hp difference.
http://thedynoroom.com/DynoRuns.aspx

[HD Street Performance]

No offense but the data is flimsy at best. These were dynos from all over the country using different brands of machines, different correction factors, so many other variables it is impossible to draw conclusions.