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[HD Street Performance]

Have you measured them the SE versions?? Wiseco makes correct..  I know that the 120R dome that Wiseco makes people have cut them but you end up under spec on them as well..

6cc not the same (cut underneath) as the 120r piston.

[HILLSIDECYCLE.COM]

Minimum dome thickness when removing material from most any piston is .180".
Some pistons with larger wrist pin pillars can go thinner, but at the sole discretion of the builder.

"Sharing is caring.
Scott"

[chicoman]

Chico sounds like you ended about where I want to be. I am about 260lbs and wife isn't a small girl either so most of the time the bike is loaded pretty well. We don't have access to 93 around here anymore, 91 is as good as it gets and would really like to be in a position where if 89 was all there was out on the road bike would still be happy. Do you have any idea where you ended on CCP?

If memory is correct it was @190-195, i will say that if i were to do again, i would not even cut the domes, but i have 93 octane by me, also my heads were ported and volume was 93 cc, and used the i think it was a .040 head gasket the piston kit came with. I used a early sert for tuning and if you need a good map to start with i could send you a copy of mine. My tune was done by bob at razorback in wisconsin. In your case with your gas situation i would either cut the dome on suburbans or get the kit from steve with the smaller dome. My dyno sheet is attached. Not the highest performer out there but im very happy with it. Torque anywhere you need it, good top end also.

[HD Street Performance]

There are many options
I sell CP customs many times for these applications as I prefer them to the SE Wisecos
Or to save a few dollars a very fine 4032 piston for the 113" +4.2cc dome is a KB KB661C in + .060 (STD 113) .065 and .070. They sell for about $275 retail.

[Yellow09SERG]

How much difference is there in reality between using the .030 and the .040 head gasket as far as squish goes when dealing with the 110 heads?

[HILLSIDECYCLE.COM]

.010" is about 1.5 cc's.
Not a deal breaker when setting things up, unless up on the edge, or down on the bottom.
Scott

[HD Street Performance]

The methodology is flawed.
Deciding on parts choices based on theoretical dimensions is a big gamble.
Get the motor apart, fluid check the heads, measure the deck height, do the math then decide.

[Yellow09SERG]

Maybe I asked the question wrong. With the old heads everything was after that .030 squish. With the open type chamber of the 110 head is that .030 still the optimal squish for promoting flame travel or is there is there really in difference between setting up at .030 or .040 as long as the desired compression is achieved in the end.

[HD Street Performance]

You're on the right track, .030 is still optimal but reality is unless you cut the barrels you likely won't hit that. With a .030 HG most are in the .034-.036 range. Truth be told though it is not that much of a heavy hitter to worry about and definitely not enough difference to take apart a good running motor to mess with.