head compatability

will a 81-82 250 head fit on a 81 430?

I am only concerned about the stud dimensions and not the combustion configuration.

One way is to see if the cylinder base gasket is the same part#.
For instance it is the same for the earlier non-primary kickstart 250/390.
Just go to Hall's Cycles online parts books.

You can make a case for the 430 by cutting out the metal which makes the crank cavity smaller. Yes sure the the main four long ones will be in the same spot but I can't say about what they call the head screws as I don't have a 250 head.

Add later,

Well from the parts sheets it looks like the 81 250 has an ealier kind of cases but basically once the cases look the same it is a web in the crank cavity as best as I examine the parts.

The 420 head has much less volume and is designed for the same piston diameter. The other 420 one has th plug exactly centered. It sure looks to me like a 500 head so long as it isn't the 84 or last air cooled version would bolt on with no mods. I suppose most of the guys here are racing tracks not slamming through rock gardens and wouldn't want to go that way.

Sumthin good I'ma thinkin!

pdub,i will keep that in mind for future parts combatability.

Good call,

Darrell

Yes i was thinking if my current head mod doesnt work out that a 250 would give me more material to work with.
Huskydoggg,Thanks for the pictures for us visual males.
Like Schimm says a picture is worth a thousand words.

Highdez,
If you want a 250 head to use, I have a good donor. A PO ground some material off the front edge (or back, depending on which way it's installed). You can have it for the cost of shipping from NorCal.