80" 80HP ( Winter thread)
Seasoned HDF Member
Joined: Nov 2006
Posts: 5,894
Likes: 1,908
From: East Coast, USA
Maybe review the information on the nightrider website? I've always found it informative.
http://www.nightrider.com/biketech/hdstage2.htm
http://www.nightrider.com/biketech/hdstage2.htm
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
Contact @Hillsidecycle.com 80 hp is pretty easy, mine was in upper 80s headwork and Woods Cam
Be interesting to see how this turns out tho. Nice winter project if you get it off the ground.
Last edited by 60Gunner; Jan 5, 2022 at 11:15 PM.
Road Warrior
Joined: Dec 2015
Posts: 1,826
Likes: 1,047
From: Southwest Desert
I would keep the CV carb and install a Thunder slide kit. Go with the jet that your builder recommends. (Ev-38 or Ev-51 cam) with stiffer valve springs, and Jims roller lifters. High compression pistons may affect your choices here. You may as well get some headwork like porting done here too. Or shell out for some aftermarket heads and matching pistons. I would guess you would easily be in the 80hp plus range after this. Good luck! 
Dynojet Thunderslide Jet Kit For Harley Big Twin Evo 1990-1999 - RevZilla
And a hotter single fire ignition if you don't already have it....even the Screaming Eagle S/F ignition and coil will work well here with your RPM limitation.
S&S Super Stock Cylinder Heads For Harley Big Twin 1984-1999 | 10% ($123.89) Off! - RevZilla
Dynojet Thunderslide Jet Kit For Harley Big Twin Evo 1990-1999 - RevZilla
And a hotter single fire ignition if you don't already have it....even the Screaming Eagle S/F ignition and coil will work well here with your RPM limitation.
S&S Super Stock Cylinder Heads For Harley Big Twin 1984-1999 | 10% ($123.89) Off! - RevZilla
Last edited by SirHarley; Jan 6, 2022 at 12:16 AM. Reason: info addition
Thread Starter
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Seasoned HDF Member
Joined: Oct 2019
Posts: 10,804
Likes: 7,444
From: OH
Maybe review the information on the nightrider website? I've always found it informative.
http://www.nightrider.com/biketech/hdstage2.htm
http://www.nightrider.com/biketech/hdstage2.htm
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,114
Likes: 7,638
From: Poolville
If you're doing all the labor yourself I'm pretty sure for 2200 ish, Scott will bore your cylinders and set rings gaps with Wiseco Pistons set 10.2:1 with a Woods W6 cam and a set of stage two heads to that and you'll easily be in the mid to upper 80s hp/tq.. It was probably the most reliable build I ever had... With real good power..
Additional would be a Dynatek 2Ki ignition and a tune.
With an S&S E and port matching on the road I would get 52 mpg..
Additional would be a Dynatek 2Ki ignition and a tune.
With an S&S E and port matching on the road I would get 52 mpg..
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,114
Likes: 7,638
From: Poolville
Shouldn't be an issue....
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
80 HP out of a 80" Evo is not that big of a deal.we done it too many times to count in the last 30 or so years.a OEM CV carb won't do it though,your going to need a 42mm mikuni at least,I'd personally use a 45mm.as far as a cam goes look at a woods W9B,CP Piston kit & good 1.94/1.615 headwork flowing in the 280cfm range,you should see in the 90/90 area
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,114
Likes: 7,638
From: Poolville
80 HP out of a 80" Evo is not that big of a deal.we done it too many times to count in the last 30 or so years.a OEM CV carb won't do it though,your going to need a 42mm mikuni at least,I'd personally use a 45mm.as far as a cam goes look at a woods W9B,CP Piston kit & good 1.94/1.615 headwork flowing in the 280cfm range,you should see in the 90/90 area
