December 20, 200916 yr comment_399538 hey all just wondering what the difference is between a 4k head and a 5k head? any info would be appreciated cheers brandon Report
December 20, 200916 yr comment_399601 the 4k head is outa a 4k engine and 5k heads outa a 5k engine :) Report
December 20, 200916 yr Author comment_399634 the 4k head is outa a 4k engine and 5k heads outa a 5k engine :) lol i mean do they have bigger ports or anything? Report
December 20, 200916 yr Author comment_399635 About $1000!! :) *sigh* I crack myself up....... hahaha yeah thats hell funny aint it Report
December 20, 200916 yr comment_399661 well a 4k head is off a 1.3L and a 5K is off a 1.5L god i feel even more stupid explaining that Report
December 20, 200916 yr comment_399684 Port size I don't know, but you can be sure the 5K has a bigger combustion chamber. So a 4k onto a 5K block should raise the compression and a 5k onto a 4K block will lower it... Report
December 20, 200916 yr comment_399688 Love the answers you've got so far :) The 5K head does not have a blast chamber in the bottom, the blast chamber is in the top of the pistons. The 4K head has the blast chamber in the head, pistons are flat on the top :P I'm sure there are other differences, but this is the biggest. You can pick a 5K head because it has a rib below one of the spark plugs. Report
December 20, 200916 yr comment_399700 Love the answers you've got so far :) The 5K head does not have a blast chamber in the bottom, the blast chamber is in the top of the pistons. The 4K head has the blast chamber in the head, pistons are flat on the top :P I'm sure there are other differences, but this is the biggest. You can pick a 5K head because it has a rib below one of the spark plugs. Pretty sure I've read that a 4K head on a 5K LOWERS compression, which is what some people have done when boosting a K engine. If I remember correctly, 3/4/5k port sizes are the same. A 5k has hydraulic lifters too, whereas all other K-series engines have solid lifters! Report
December 20, 200916 yr comment_399704 Forgot about the lifters :P I've had mine converted to solid so I could run a lumpy cam :) Report
December 20, 200916 yr Author comment_399706 ok thanks guys. So if i was to put one on a 3k motor it would lower the CR? Report
December 20, 200916 yr comment_399712 NO! 5k head onto a 4k or 3K especially would bring the compression up to something crazy. 5K head > 3K High to VERY HIGH comp 5k head > 4K Even Higher comp 5k Head > 4K-U Stock Comression 3K head > 5k Low comp 4k head > 5K Lower comp 4K-U head > 5K Stock Compression Report
December 20, 200916 yr Author comment_399717 NO! 5k head onto a 4k or 3K especially would bring the compression up to something crazy. 5K head > 3K High to VERY HIGH comp 5k head > 4K Even Higher comp 5k Head > 4K-U Stock Comression 3K head > 5k Low comp 4k head > 5K Lower comp 4K-U head > 5K Stock Compression thanks for the info mate Report
December 20, 200916 yr comment_399724 yes, there`s 2 different 4k heads and 2 different 5k heads Twin squish 4k head (as in 4k-u amongst others) are the same as most 5k heads. These have slightly larger ports than the regular "flat top piston" 4K heads, way smaler combustion chambers, and use shorter pushrods Report
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