Is this 113 head scrap?


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By 46yblock - 18 Years Ago
I've been looking at this head for almost 14 years, thinking it to be useless.  But what do you think?  Hopefully the pictures will show installation of hardened seats for 1.78 intake and get this, 1.45 exhaust.  It looks to me like a significant amount of combustion chamber has been bored away, leaving some sharp edges to help assure detonation.  Your input will be appreciated.

Mike

By Ted - 18 Years Ago
Mike.  From your description you've only got one head like this?  If so, then I'd question the effectiveness of having another head and especially a 113 casting modified to match.  Looking at the pictures though, it looks like there is enough seat to cut for the larger valves if so inclined which would make this head potentially usable with another similar casting.  The chambers would still need to be cc'ed after the valves are ultimately fitted so they could be matched to another head.  From the pictures, I couldn't tell how much of the chamber has actually been cut away but this would have to be duplicated on another head if that's the case.
By 46yblock - 18 Years Ago
The depth of the hard seat "reliefs" is approx. .040 on the exhaust and .050 on the intake, measured crudely with a spark plug gap gauge rotated until level with the combustion chamber.

The intake seats overhang the port.  Maybe as much as .020 on one side, and on the exhaust it is the reverse with the port being outside the seat the same approx. amount.

If there is enough material for a 1.92 and 1.54 valve, will the shop bore out the inside diameter of the seat?  Surely seat installs dont normally look like this Crazy.

Yes I only have this one oddball.  It was actually "rebuilt" for my first motor, but when I went to put the top onto the block, there was the 113 and a C.

By Pete 55Tbird - 18 Years Ago
OK. Why don`t you take your cylinder head to your machine shop and ask them? We can speculate forever but we are not the ones to ask. Pete
By 46yblock - 18 Years Ago
OK.
By pegleg - 18 Years Ago
Mike,

           I've actually seen worse examples of seat installation than that. Often the ports are not matched to the seat and there is a sharp edge. It takes very special stone to clean that up and a lot of shops won't grind one stone for your head, never to be used again. I'd do what Ted said, Find another head, have a GOOD machine shop install larger valves and mill to match each other. At least you'd be able to use the head. You can match the ID of the seats to the ports  by hand before you put the final cut on the seats.

By 46yblock - 18 Years Ago
Thanks Ted and Frank.  A little info always helps before showing up at the machinist's.