I’m doing .027 head gaskets so my heads have to come off. I have read that if I mess with the heads the jugs have to come off and I have to replace the O ring. ? Then am I supposed to replace head bolts or studs? I did my run out and I am at 0.002 so I must have got lucky on that one. Lastly stock throttle body is a 50mm I believe does anyone bore these any longer.

 

New cylinder orings are recommended as insurance. Also gives you a chance to check stud torque.
stock head bolts and studs are adequate.
A new 58mm TB from SE is cheaper than a 58 from HPI, and works very well.
Replace the cam bearings ( and maybe lifters) while you're there.

 

I agree with rigid thumper but would add that if the heads come off and the cylinders are not "disturbed" get some 1/2" PVC couplings, slide the over the cylinder studs and secure the cylinders so you can't unintentionally "disturb" them and you can avoid puling the cylinders to replace the base o-rings. Sometimes the heads have to be "encouraged" to separate from the cylinders which will disturb the seal between the cylinder base and the motor cases but sometimes not; of course, be just as careful placing the heads back on the cylinders. I have managed to R/R heads in this fashion a couple of times over the years so I know it can be done; maybe it will work for you.

 

if you guys Know Scott @ Hillside can you ask him what kibble white spring he likes to replace the 110 cvo head stock ones

 

Drop him a line or better yet, give him a call; Scott is available and easy to talk to. https://www.hillsidecycle.com/

 

I have a gasket kit for a 96 and 103. Is the 110 cylinder o ring the same as the 103?

 

No, the 110 is cut for square orings. Kit part number 11907 contains cylinder base and drain orings.