Once again if you have had success just raising the exhaust,you were not starting with 110 degree intakes.I too have had good results with just raising the exhaust timing, and increasing CR but I will definately try shimming the sleeve as Rod has suggested. I have wanted to try this mod for a while but for me it has been difficult to locate the correct diameter and thickness of shim.
It is difficult to try and locate shims pre made.I have a lathe and mill and a ton of aluminum and brass rounds so I just make what I need.
Listen guys,don't just start making shims and start installing them blindly hoping for the best.Spend your money on a copy of the Marty Davis E.A.P. program and learn how to use it.
These are great starting #'s for for any .21.Start by setting your intakes at 125,set the exhaust at 170 to 172 unpiped,180 to 182 piped.Leave the crank timing as it comes.Set the CR at 9.8- 1 and start from there.If the motor has good bearings,great crankcase compression[not a leaker],good P&S fit,a straight rod that has clearanced properly....the motor will run like hell if you let it.
For all you guys that know Ron Zaker and have seen him run......[126INT-182EXH "top hatted" and stock crank numbers are the numbers on all Zakers 3.5 hydro motors and he is running in the high 70's on 65% in heat race form.Believe me motors alone will not get you running fast.It is the total package.]