I have been looking at the S&S 106 big bore kit. They suggest that it isn't safe to bore the stock 96 inch cylinders to this size.

Has anyone bored out their cylinders to use the 3.927 pistons?

 

If I were you I'd just get the cylinder kit. You can tell the cylinders s&s has are much more heavy duty than the stock cylinders. Plus the pistons are made for those cylinders.

 

I believe the stock jugs can be bored to that size. Check out Head-quarters.com.

 

yes; I have had two HQs 107's for a total of 47k + miles not a problem out of them

 

Does HQ supply new jugs, or rebored stock?

 

rebored stock

 

Thanks for the help. Initially I was just planning on doing a SE 255 cam swap so the project has grown and I am trying to keep costs down. I will call HQ as well as look for machine shops in the Boise area.

 

Funny how a project can grow like that. Here's another place that can offer top quality work and they're much closer to you.

http://www.nrhsperformance.com/

 

Well, duh - I sell 106's, I am of course going to say that 107 is not safe to do. Actually, the 106 is sort of a "bastard" size. Not many out there.

You will find that the 107 is a rather common bore size and a lot of engine builders find no issues with doing this. Others will swear that it is not the right thing to do, but...I am still waiting for someone to say their engine failed due to thin cyl walls, poor heat dissipation or other supposed problems with 98/107 bores. I have built some 107s and they have turned out well without issues.

 

Any piston recomendations for a 107 build?