Zoidburg Posted August 26, 2012 Report Share Posted August 26, 2012 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 Quote Link to comment Share on other sites More sharing options...
SLO-030 Posted August 26, 2012 Report Share Posted August 26, 2012 Yes. A 5K Flat top head is the same as a 4K flat top head. Quote Link to comment Share on other sites More sharing options...
GJM85 Posted August 26, 2012 Report Share Posted August 26, 2012 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 Quote Link to comment Share on other sites More sharing options...
Zoidburg Posted August 29, 2012 Author Report Share Posted August 29, 2012 Thanks very much guys, that's a relief! I will get a recon 4K head and see what happens. Cheers Quote Link to comment Share on other sites More sharing options...
tojo2 Posted August 29, 2012 Report Share Posted August 29, 2012 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 Quote Link to comment Share on other sites More sharing options...
Zoidburg Posted September 1, 2012 Author Report Share Posted September 1, 2012 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 Quote Link to comment Share on other sites More sharing options...
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