80 evo Big Bore Kit
#1
80 evo Big Bore Kit
I have a 99 heritage softail classic 1340 80 evo, it's getting up there in mileage so I was wanting to go with a big bore kit, nothing that requires an machine work or different crank.... i wouldn't care to have some work done on the stock heads or find a different set if needed....I don't want a race engine just want some more pull power with reliability.... everything is still stock except it has a Andrew's ev 27 cam adjustable pushrods an aftermarket ignition, Vance an Hines longshots no baffles an k&n air filter.... I found one on dennis kirk website, just needing help on if this would be a good kit or another kit would be better....
#4
Unfortunately, this kit is for the Twin Cam engines. So your best option to increase engine size is to install stroker flywheels and have the heads ported. At that point you may want to select a different cam as well. But at some point you will be limited by the EVO cases and the cylinder size they will accommodate.
If it were me, I would not bore the cases th accommodate larger cylinders because it weakens the area where the cylinders seal to the cases. The EVO is a great engine, but it was not designed to reliably produce 100 hp and 100 TQ. PART # 910-0481
DRAG PART # 0931-0536
TUCKER PART # 483999
Fits: 1999-2006 Harley-Davidson Twin Cam Models
Paul
If it were me, I would not bore the cases th accommodate larger cylinders because it weakens the area where the cylinders seal to the cases. The EVO is a great engine, but it was not designed to reliably produce 100 hp and 100 TQ. PART # 910-0481
DRAG PART # 0931-0536
TUCKER PART # 483999
Fits: 1999-2006 Harley-Davidson Twin Cam Models
Paul
#6
The EV 27 is a little bump in hp/tq. But if your looking for more power without going into the cases then pull the top end down and send the jugs and heads to Kirby or Scott and have them fit a set of Wiseco with 10:1 pistons and Stage II the heads with the Woods W6 cam and it will be all you want. However You MUST get rid of those pipes.. Their good for nothing but noise.... Years ago I had that build and as powerful as it was, high 80's torque and horse was great and still got 52 mpg on the open road....
#7
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