Hi guys i have found alot of information about 4k/5k hybrid with solid lifters, but not much information and hydriaulic lifters. I am currently building an engine running the 4k efi gear and am using a 4k head this in order to keep valve clearances correctly adjusted, i would rather use hydraulic than solid since, you would have to dismantle the whole intake to adjust solid lifters.

 

Is it possible to have hydraulic lifters in this hybrid engine?

What sort of pistons do you have in the block? If they are a fairly deep D shape then you're not going to have enough compression to run the 4K head unless you plan on forced induction. The problem with mixing and matching is that the push rods are shorter because the hydro lifters have a higher seat in them. You're really going to have to assemble it all and see if the followers wipe the end of the valves properly which ever setup you do. Mixing and matching is what makes swapping a pain.

 

Get a 5K head if you can, the ports are generally a little nicer and you know you'll be closer to the correct geometry. I don't think there is a lot of difference in the height of the heads, but I'm not 100% on that. You might be able to adjust clearances by getting the follower towers machined a bit, but I wouldn't go too far with that as it may mess up other things.

Just run a 5K head if you have dished pistons.

 

Look for pushrods out of a shallow dish piston 5K. These run a 4K head and hydro lifters and the pushrods will be the right length.

 

Deep dish piston heads are denoted by 2 lugs/tabs under the spark plug tubes. 1 on cyl #1 and the other on cyl #4.

..... you would have to dismantle the whole intake to adjust solid lifters.

 

Um... Remove the rocker cover to adjust the lifters!

I think he means the plenum will cover the top of the rocker cover?

 

Should all be possible, but remember that you will need to run a hydro camshaft.

so. what is the best head to run on a K motor? someone told me a 3k head.. I didnt think there was much difference in the k heads.

4AGE it appears...

 

http://www.rollaclub.com/board/topic/51097-4k-twin-cam/

so. what is the best head to run on a K motor? someone told me a 3k head.. I didnt think there was much difference in the k heads.

 

There is a huge amount of difference, mostly in height and combustion chamber size. From very small 5K big dish, to stock 4K. You have to say which K motor, or even better, measure it for yourself!