Author Topic: Evo SE Heads???  (Read 591 times)

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Offline Reddog74usa

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Evo SE Heads???
« on: January 17, 2018, 07:03:28 AM »
What's the difference between a stock head or the SE version?
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Offline turboprop

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Re: Evo SE Heads???
« Reply #1 on: January 17, 2018, 07:53:24 AM »
The most obvious difference is the shape of the combustion chamber. The SE version has a bathtub shape, similar to the Branch #4 design. The SE valves are larger. Not sure about the chamber volume or port shapes, I am sure there are differences. WFO Larry is known to have done a few sets of these and I think he even runs a set on his own bike. Might try sending him a PM or hitting him up through his website.
'Never try to teach a pig to sing, it only wastes your time and annoys the pig'.

Offline wfolarry

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Re: Evo SE Heads???
« Reply #2 on: January 17, 2018, 10:24:15 AM »
I do have them on my bike. Better chamber & better ports than stock.

Offline kd

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Re: Evo SE Heads???
« Reply #3 on: January 17, 2018, 10:32:30 AM »
I seem to remember that they have been cut (.060 ?) too. I may need to be corrected though. I have 2 sets in use but never measured them for comparison.
KD

Offline Scott P

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Re: Evo SE Heads???
« Reply #4 on: January 17, 2018, 12:34:18 PM »
...........and the intake pads have more material removed than a std. Evo head, also.
Otto Knowbetter sez, "Even a fish wouldn't get caught if he kept his mouth shut"

Offline barrybasinger

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Re: Evo SE Heads???
« Reply #5 on: January 21, 2018, 09:43:06 AM »
What's the difference between a stock head or the SE version?
My opinion based on my long-time use of them:
Very good heads up to around 95 horses or a little better (as delivered: HD spec'd 90+ on their hotter SE 80-inchers with SE-60 cams back in the day, and I've seen as much as 96 horses on my own engines, but I feel that's pushing the limit for stock heads)
1.898 intakes and 1.615(?) exhausts
Detonation resistant
9.5:1 CR with stock-style pistons, 10.5:1 with SE domed pistons
I like the intake port vane especially.
HD said 140 cfm @ 10. I've seen independent shops record 136.
I've put as much as .565 lift in them with stock springs, .590 with aftermarket springs. 

Larry can correct me if I'm wrong on anything above, but I kinda like the damn things. In fact, I hope to get him to work on mine for my 96-incher this year. (I got the power-jones again)

Offline Reddog74usa

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Re: Evo SE Heads???
« Reply #6 on: January 22, 2018, 08:27:20 AM »
Thanks for the replies
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Offline NickC

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Re: Evo SE Heads???
« Reply #7 on: January 22, 2018, 11:24:09 AM »
What's the difference between a stock head or the SE version?
My opinion based on my long-time use of them:
Very good heads up to around 95 horses or a little better (as delivered: HD spec'd 90+ on their hotter SE 80-inchers with SE-60 cams back in the day, and I've seen as much as 96 horses on my own engines, but I feel that's pushing the limit for stock heads)
1.898 intakes and 1.615(?) exhausts
Detonation resistant


9.5:1 CR with stock-style pistons, 10.5:1 with SE domed pistons
I like the intake port vane especially.
HD said 140 cfm @ 10. I've seen independent shops record 136.
I've put as much as .565 lift in them with stock springs, .590 with aftermarket springs. 

Larry can correct me if I'm wrong on anything above, but I kinda like the damn things. In fact, I hope to get him to work on mine for my 96-incher this year. (I got the power-jones again)
I was not aware that stock style pistons could be used with the SE heads thats good to know . When I did my motor last year only pistons I could find were 20 over wiseco 10 1/2 to 1 s .Thought that was my only option.

Offline kd

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Re: Evo SE Heads???
« Reply #8 on: January 22, 2018, 11:34:00 AM »
Both my Evos have SE heads and stock std pistons.
KD

Offline Reddog74usa

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Re: Evo SE Heads???
« Reply #9 on: January 22, 2018, 03:02:06 PM »
How do you like them KD?
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Offline kd

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Re: Evo SE Heads???
« Reply #10 on: January 22, 2018, 06:52:25 PM »
How do you like them KD?


I used a SE-3 cam, SE slipons and breather with them, so judging just heads is tough. I put them on the 2 1998 80" Evos in my avitar to boost the power for the loaded sidecar duty they have. I used  the stage 2 cartridge tune that I had and checked it on the dyno before going to the recommended stage 3 flash. It was running good and just a smidge fat (which I determined I would rather have than chance the stage 3 being lean) so I left it at that. Mileage is decent for a sidecar rig. The flash cartridge is a one time use and I wasn't interested in digging up another one if I had to go back to a 2. I ended up with almost 80 HP @ 5500 and almost 90 Ft #'s at 3600 (80 ft #'s at 2500). They pull hard and the best from 3000 to 5500. When disconnected from the sidecar they will run hard right beside a stage 2 88" twin cam Street Glide and light it up good going into 2nd and a little in 3rd.

The heads themselves looked nice (internally) but that doesn't mean much. We're talking port appearance but nothing more. There was a nice little boost in compression that I am sure made a big part of the difference but all reports are that they do pick up the flow nicely too.
« Last Edit: January 22, 2018, 08:39:57 PM by kd »
KD

Offline Reddog74usa

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Re: Evo SE Heads???
« Reply #11 on: January 22, 2018, 07:31:20 PM »
Thanks :up:
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Offline FTBY55

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Re: Evo SE Heads???
« Reply #12 on: January 23, 2018, 08:47:34 PM »
Overall height is slightly taller. Had dealer install them on my '96 FatBoy and the Arlen Ness Oil gauge was rubbing against the bottom of the fuel tank. Put thick washers under rear mounts to shim tank.