View Full Version : Time for top end rebuild any advice 04 xb12r

07-13-2016, 12:17 AM
Just found my head gaskets blown, fixing to tear top end down, is there any advantage to use wiseco pistons, or better to stay stock if no damage? Would like any opinions/advice to make this a one time job, or add a little power.

07-13-2016, 01:16 AM
how many miles, and have you seen any signs of blow by?

07-13-2016, 01:35 AM
If it were me I wouldnt unless the pistons were damaged. And if thats the case I really like hammer performance's offerings. I just wouldnt wanna bump compression

07-13-2016, 01:58 AM
40,000 no blow by actully really clean,may just do complete build with new bearings, and shifter forks to be trouble free for another 40k.

07-13-2016, 01:59 AM
If insides are clean may just hone and new rings, on top end and of course check for warpage

07-13-2016, 12:57 PM
^^ this

07-13-2016, 01:08 PM
I see that you have a duplicate thread. Maybe delete the other one. Ill copy my post here too since this one has other responses in it.

Go with some james or cometic gaskets for replacements. The steel gaskets especially between the case and the bottom of the cylinder will hold up much better than factory.

Depending on mileage lapping/recutting the valves while the heads are off is sometimes a good idea.

If the pistons are good Id probably just do rings and a hone on the cylinders. Make sure to check all of the connecting rod end play and crank runout while the engine is apart.

I went through a rebuild on my 04xb12s because of a base gasket and a bad transmission output bearing just over 20k miles. Those are the things I went through and its been good since(currently at 46,000 miles). One crank bearing ended up needing replaced too. I agree with not going any higher on compression. Its tempting, but I didnt want any extra headaches. I thought about it too at the time.

07-14-2016, 11:14 AM
Yes sorry for double post was back paging on ipad, and it was still on the post page so I hit it again, thinking it didn`t post. Can you tell me how to delete.Thanks again for advice