5K O Dish Head

[Zoidburg]

Hi everyone,

 

Recently rebuilt a 5K bottom end with the flat top (O dish) pistons, but don't have the right head to suit. I tried scooping out the shallow chambered 5K head for the D dish pistons, but keep blowing head gaskets as the comp ratio is 13:1. I need to get hold of the O dish 5K head, or put a 4K or 3K head on.

 

Does anyone know if a 4K head is the same height as the O dish 5K head, in other words so the pushrods will be the right length (I have the O dish pushrods). If so, what will the compression ratio be? I'm using hydraulic rocker gear.

 

Needless to say, if anyone is selling one...

 

Thanks

[SLO-030]

Yes. A 5K Flat top head is the same as a 4K flat top head.

[GJM85]

4k head is the same dude. Your running my old rods, lifters and rockers. Ive got a shallow 5k, solid lifters and a 4kc head. Running about 170-180psi on each cylinder. I worked it out to about 8.7:1

[Zoidburg]

Thanks very much guys, that's a relief!

 

I will get a recon 4K head and see what happens.

 

Cheers

[tojo2]

suggest you get the inlet manifold that goes with it as from what

Ive seen 4k flat top heads have smaler ports than D dish heads

 

 

[Zoidburg]

Yeah I might just have to port the 4K head out.

 

I'm running a brand new 45 DCOE, so I'm guessing the runners on the manifold will be bigger.

 

Thanks