Hey I'm thinking of pulling the jugs off my 89 evo and putting in some 10-1pistons has anyone done this and what problems did you have?

 

just make sure your cam matches the compression

 

As in over lap? Too much will kill it and too little overlap will raise compression too much, am I correct?

 

yes,duration is very important.running too little with a higher compression motor will result in hard starting,overheating & detionation.cam timeing specs should also be looked at for a cam that will put power in the RPM range you want it in

 

No problems whatsoever if in fact you bring a cam along to bleed some of the increased ccp you'll be building.
A Wiseco 10.0 cr piston has a dome volume of 12.9cc's, for instance.
Under the OEM HD chamber, even with a .030" head gasket, it comes out to around 9.8 cr.
That said, a Wood 6, Andrews 27/3/46 will all work.
Comp Cams, Crane & S&S all have cams with an intake closing/lift numbers that'll be at home in that bike.
Scott

 

Thanks guys can I ride the prodrag bike?

 

buy it and ride it all ya want