Could a 87 430 L/C cylinder & piston bolt on to a 86 400.

Does this sound like an easy swap?
Is the the sleeve that much larger that is does not slip into the cases.

Thanks.

Steve

all 400-430-500 share same case halves

a 430 is a big bore 400
i had both

Does the 400 head work on a 430?
Just wondering if the stamped 430 head is different CC volume than 400?

yes the volume is different but a 400 head can be modified to lower the compression to a 430 head

From what I have seen and it is only two 400 heads the earlier ones have a cast in number and are higher compression while the later ones seem to be 430 heads just not stamped as such. I would say an 86 is later but my sample is small and all obtained used.

I wonder now what the vibration factor would be like, more or less?
2premo is there more, due to a heavier piston.
Or do they keep pistons weights the same between 400 & 430 and not rebalance the cranks.

Higher compression in high altitude might be ok, i think with my thin air where i am.


Thanks guys!

the 430 will likely vibrate a tad more but much of the swede vibration is in whether the crank is balanced or not it seems. my 400 is really really smooth and rev happy.

the reason these existed was competition, don't think they were too concerned about the vibration
the owners manual said to do major work after 8 hours, pull the top end etc.
back to the 400 430 question the cranks are the same part so if the piston is a bit heavier, well, shake your booty

Won the auction, paid $50 for a cylinder, piston and ring.....

Some of that stuff looked or looks pretty good. I got frustrated searching husky parts years ago but going sellers other items was kind of tempting on a few. I left the guy alone on the primary drive clutch but he didn't go strong enough. That is still first size. If you intend on using the piston look carefully at the wristpin bore as the standard shift ones seem to get egged out in the up down direction. The earlier 420/430 design had a longer wristpin.