Hi all, have the old 07 fatty that I’ve stage 2 already and thinking maybe stage 3. Do you think boring to 107 and doing some head work is really worth it. Cheers 

hi mate it depends if you are happy spending the money, personally I think it's worth it, have a look at the attached dyno charts from Fuelmoto there are big bore 107's included-https://university.fuelmotousa.com/dyno-charts/ this should help you to find the right cam for where you want the power eg- low down torque or rev the needle to the redline power/hp

Thanks for your information wideglidingNZ

OR..... one of those turbo units that bolts onto the primary side!  Now thats POWER.

If your pipes are Big Radius , you will waste your money trying to get a good 107 to work.  If you are married to the pipes, then build a combo which is sound and make about 100hp at the tyre. 

Hey Lushy, no the old girl has had a few upgrades since the photo. Rinehart 2 into 1 S&S cams, intake oil plate & pump. Goes well just thinking of a bit more… of course! 🤙🏻

Sounds like you understand the deal, as they say, no replacement for displacement, good heads helps along with the tune.

No worries, which cams? 

S&S 583’s

I took my old 88 cube out to 107 with s&s 585 cams and headwork and 45 mikuni.went very well

How much comp do you expect to run with that 18° close on the 583's?

Hey Hoodeng, not sure mate what’s your recommendation and thoughts on this, would prefer to only do things once of course. 🍻

What is the target comp of what you intend to build? you have indicated 107"

They’re recommending bore the standard cylinders to 107 and do some head work while doing the decomps. Other than that I haven’t discussed much as I don’t know a lot about it. 

I was told the S&S 583 would be a good mix for when the 107 works were done… would you disagree or what comp would you suggest with these cams. 🍻

You need to rethink this setup, or work with someone who can guide you holistically (obviously whoever your buying the parts from and who's doing the work)

Thanks for the advice 

I have just fixed a job for a customer, which was done with a 107 kitted bike, 10.5 comp and these 583 cams. It had partially seized and was running like shyte. WAAY too much cylinder pressure. It was an unpleasant experience for both the owner and myself, costly as well.  As others have suggested the early  ( super early) inlet close figure means this cam is ok for  what you have now ie: getting good low end in a stock low comp 96 cube motor. I would respectfully suggest that whomever told you to use those cams in a 107 is not where you should be getting your next job done.