Got an 04 with several mods.. Taken it from the 9.9 compression stock to 11.5. Has anyone gone to 12.5 or over 13 ? If yes how did the head hold up ? Who made your pistons/sleeves ?

Before I get too old wouldn't mind adding one more engine enhancment if it's worth it.....

((796cc, 11.5comp, Empi 44mm dual down drafts, mild head work, Full Dalton Clutch, FST CDI, HMF Dual ex, Works shocks, 22" Skat Trak Extremes))) Ya it runs, but there are many mod 700's that have smoked me.

 

Here is my take on this.
I would leave your 11.5 in there. It's a good compression and you can run it on pump gas. Going from 9 to 11.5 will give you good power gains. Going from 11.5 to lets say 13 won't give you the same power gains. It just does not work that way.
If it were my quad with your mods I would do two things:
#1 Make sure everything is working together and tuned up real good.
#2 If your still not making enough power add some nitrous for some fun.
That 800 should be very very fast the way it is if everything is tuned up.

 

I've been to 13:5 and now back to 12:5,

I don't see what you have for cams. a good set of cams might be the first step if you only have stage 1's.

 

My Bad, I do have 254 degree cams from Crower Power. Why did you back it back down too 12.5?