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[Ridgerunr]

What kind of power can be expected using S&S .570 cams in a 110" keeping the stock pistons and ported heads?

[prodrag1320]

as long as compression is bumped up to 10.0-1 to 10.25-1,we`ve had very nice results with 570`s in 110 motors (125+125+)

[Ridgerunr]

Are the OE cast pistons good at 10.2:1 ?

[TorqueInc]

The 110 pistons are forged

I would not excessively surface a set of heads just to run a 570 cam

Great cam......just others out there that would be better for a heavy bagger

Zippers 587 is a go to cam with a bump in compression

Would strongly suggest rebuilding the heads.....valvejob,seals,springs.

They would be off.....good time to do it

[Ridgerunr]

Didn't know OE 110 pistons were forged. In that case I would use domed to get to 10-10.2:1. This will be going into a FXR. Thanks TorqueInc.

[HD Street Performance]

Conveniently available are a good selection of .001 and .005 OS pistons so a light hone can bring the cylinder back in for a fresh start. I too would recommend a refurb on the heads which includes a more sensible but not beehive spring selection when done here. The compression can be picked up by 0 decking the cylinders and a small dome, if needed.

[prodrag1320]

I agree with not milling heads to get to 10.25-1,id get pistons,that said id go 113"

[Ridgerunr]

Conveniently available are a good selection of .001 and .005 OS pistons so a light hone can bring the cylinder back in for a fresh start. I too would recommend a refurb on the heads which includes a more sensible but not beehive spring selection when done here. The compression can be picked up by 0 decking the cylinders and a small dome, if needed.

What about porting? Or are the ports untouched good for 120/120?

[1roadking]

At this point just grab the Suburban speed 10.7 to 1 117 slip on kit and call it a day

[HD Street Performance]

At this point just grab the Suburban speed 10.7 to 1 117 slip on kit and call it a day

There are a number of things that become constraints at about the 110" 115hp level including the throttle body, injectors, and the heads. Understand this is not a line in the sand but a gradual decline showing as an early drop off at high rpms. Torque remains. The 117 kits fix this with the proper pieces. The 117 kit with head work is a sweet combination, better yet don't use the kit and just the cylinders and use KB domed pistons, cam and throttle body and purchase a heavy breather. The 259E cam is much maligned but turns on real well with the combination I am describing.

[busarealfast]

TorqueInc, what is concidered ideal C.R. for the 587 cam?

[TorqueInc]

TorqueInc, what is concidered ideal C.R. for the 587 cam?

Down south 9.8-9.9

Up north 10:1

10.2 with a killer tune

[Ridgerunr]

"There are a number of things that become constraints at about the 110" 115hp level including the throttle body, injectors, and the heads"

I'll assume that answers my question on porting. 

[HD Street Performance]

OK I just didn't want to say you hit a hard wall there. It isn't all that hard to get a 117 kit to hit 140 squared with the right parts and ported heads, still a streetable combination that is reliable for touring. That comes of course with ported heads and a cam in a different class than the S&S mentioned.

[MCE]

What are you doing on the M8 heads as far as springs? (They're using bee-hives)