Hey Guys.

So I found my boyfriend some 113 heads, and he wants them rebuilt, a new cam; yadda yadda. What I need to know is whether or not he'll have to remove the timing gears or if the computer needs to be reprogramed? Also anyone know ball park how much it'll be yo rebuild these things, slightly ported.

Thanks!
Amanda

 

You're gonna have to remove the timing chain assembly to upgrade the cam. To just put the heads on, you dont have to mess with it. The distributor will have to be removed along with the intake, headers/manifolds, and the accessories will ahve to be pulled off the front of the enigne too. You'll probably need a power steering pump pulley puller to get the bracket off to get the heads off.

As far as rebuilding them, generally it's just a matter of a valve job, checkin valve guides, and maybe replacing the valve springs with new ones to fit your cam. Just make sure you get it pressure tested before you spend any money on it.

What is "slightly ported"? Thats custom work you have to have an experienced person do. That means labor rates through the roof. If you want to spend money to have them completely redone and ported, you're better off getting aftermarket or at least new heads. Porting is a bit of an art, it takes guys who know what they're doing with al ot of experience to get it right. I'd leave the machine shop work to things that can be measured. Things like back-cutting the valves, or replacing the valves with nice valves that have undercut stems and a back cut on them. At least a 3, maybe a 5 angle valve job. That kind of stuff will pay off and be far less of a "maybe it helped... maybe it didnt" kind of deal. But if you know a local guy who has a good reputation for porting heads, by all means let him have some fun with it. But I dont know any of those people, and I dont trust some random guy at a random machine shop to do it well.

As far as the computer goes - anything worth digging into the engine to change is going to need a change in the tune. Anything that makes a noticable difference is going to upset the tune, regardless of whether it's computer or carburetor or whatever.

 

alright so i see my gf is trying to get info for me :-) on the 113 heads im picking up i know that these 113 do have a smaller cc that i have now. i believe they are 55cc, the heads i have now are cast iron 70's 194 intake valve with 76cc cut down to 64cc i believe they are 1.5 rockers i intend on getting 1.6 roller rockers for the 113 heads as well an also do plan on getting new valve seals an seats since the seller told me that they will need to be rebuilt anyway plan on getting on new springs as well for the heads just dont know what kind

 

Springs are deteremined by the cam. Cam is determined by power goals compromised against streetability/practicality/mpg goals and your compression levels.

When you pick a cam, look at the recommended springs and use either those, or something with similar specs. Things like installed height, seat pressure, open pressure at a given point, and coil bind are what you're looking for.