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Location:
Brisbane
Registered:
July 2004
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3K head to 4K block, wher from here
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Tue, 24 August 2004 10:44
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I finallyl picked up a 3K head today i think its the bigport its a 3K-H engine from a KE36 wagon, is this a bigport the numbers on the head are 12416, 66 between middle sparks and compliance plate says 3K-H, i called around from some prices of recos and porting and got $210 reco, $520 street port and reco, is these prices respectable?, the head has cleaned up quite well, basically i need to know what is neeeded to fit this head to a 4K block , do i need to change the 4K rocker arms and pushrods fro the 4K block,? i was speacking to a guy today bout the compresssion ratio gonig up and he said to get a stronger bottom end to deal with it so i mgiht pick up a 4K at the wreckers but i think its seized, is there any technical documents that i can get to find about exchanging heads from 4K to 3K and would a manual give a description,? if no one is able to help me out on here could you pm me with mobile numbers and ill be happy to call you, if not, could anyone suggest a shop to do a quality reco in brisbane? thansk everyone
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Location:
adelaide
Registered:
April 2003
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 01:58
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510 for a recon head and big port job is about right
use the 3k rocker gear thats already on the head and the 4k pushrods from the bottom end and everything will work fine
might as well pull the cam out while the engine isnt in a car and the head is off and get repco or somewhere to do a 'performace street' type regrind - will cost about $90
you dont need to use a stronger block, the standard 4k bottom end is bulletproof already. just put a new head gasket on and away you go.
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Location:
Brisbane
Registered:
July 2004
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 02:17
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when i change the head, if i getthe cam done can a 3K camshaft do the same job as a 4K or is it differnet?? what do i look for on the head to see if it needs the reco and portjob?, is a 3K-H a bigport head or is all the 3K heads big port?, once the head is done should i getthe cam from a 3K and get it ground 25/65, once i put a set of extractors, will the car be ready for a bit more performance or what else can i do?, any suitable carbys for the 4K?
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Location:
adelaide
Registered:
April 2003
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 02:28
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whatever cam is in th4k, just use that for your regrind
if the head's come off a running car it probably doesnt need a reco. it doesnt 'need' to be ported either but it will help, its up to you really.
call up camtech or go to your local repco and tell them what you want to do with the cam and they will point you in the right direction.
you can use a DGV type weber or twin aisan carbs or if you feel the need you can put twin webers on, again its up to you. the mottoe here is how fast do you want to spend?
you can build a fun 4k for only a few hundred dollars :
4k $100
big port head $50
cam grind $90
twin carbs or dgv weber $100
head gasket + manifold gaskets $100
oil + filter $20
coolant $10
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Location:
Brisbane
Registered:
July 2004
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 02:52
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How can i tell if the head is a bigport or not? so all i basically need is the 3k head, rockergear, and use the 4k pushrods, 4k ground cam roughly 25/65, nice set of extracors and a 2" exhaust how much HP would i be looking at at the fly?, wheels?, ill get the head reco so i can run it on PULP, isthere anypoint in porting a big port or not?, should i port the inlet and exhaust ports on the side of the head aswell? when you say the block is virtually bulletproof, should i do a re-ring to it just to be safe, or is ther anyway to test the block without knowing if it needs it or not, setting up all this cam work, head work should i look atvgettting electric ignition or a GT40R blaster coil or anything to improve spark?
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Location:
adelaide
Registered:
April 2003
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 04:08
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the bigport heads have physically larger ports but i dont know the measurements... i think you are a bit confused regarding head porting, have a bit of a read on stewart's 'oldcorollas' page to get an understanding of what he has done (google oldcorollas - his page is stewie.uninsw.edu or somethng). you can run PULP through a 4k with no modifications.
i wouldnt bother with a re ring as it will cost twice as much as the motor is worth, and yes get an electronic dizzy if you can it will make things run a lot smoother.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 04:17
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Is it possible to clean up a 3k head at home? We have a 3K head laying around but it needs a clean up (bit of sludge, bit of dirt and grime). Just spray degreaser on it and attack it with a toothbrush?
That'd be a really cheap and easy performance mod for more torque!
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Location:
adelaide
Registered:
April 2003
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 04:20
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scano - i just remembered something about big port heads : the big port head will have a welsh plug at the rear of the head where a small port head has a plate that is bolted on.
hydra - might be worth taking to a head place to get the face machined and tested when you have cleaned it all up (cheap) - give it a shot!
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 3K head to 4K block, wher from here
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Wed, 25 August 2004 04:24
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I think I might since it's so cheap 
It needs new spark plugs though... the ones on there are pretty damn f*&#ed!
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Location:
Brisbane
Registered:
July 2004
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Re: 3K head to 4K block, wher from here
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Sat, 28 August 2004 02:16
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ifound i dont have the bigport head beacuse i have the plate on the end of it not a welsh plug, anyway will it stil be an improvement to put that head on anyway for any increase in HP? torque?, i can get a cheap reco, port, but what shold i look for, if i want to get a reco done, is there anyway to see the valve seats? what carby can i put on the engine like what size weber could i put on there 32/36 to large?
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 3K head to 4K block, wher from here
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Sat, 28 August 2004 02:24
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From what I remember, it's all covered in the FAQ... you can use a 32/36 webber but you'll have to jet it down.
http://superjamie.net/oldcorollas/
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: 3K head to 4K block, wher from here
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Sat, 28 August 2004 11:08
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Yup yup have a look at SuperJamie's site and Stewart's is
http://www.materials.unsw.edu.au/~sford/
From whats been found the bigport heads have a number 010. That is eg 24010 154.
Quote ".....It's all in the numbers cast inbetween the third and fourth sparkplug holes. The first line is the one to realy look at, more specificly, the last three numbers of the top line should be 010 if youre looking at a bigport. As for the smallports I've checked, none of them had 010...." Unquote.
Quote "Other ways to identify bigport heads is the (welsh)plug on the back, o ring valve stem seals, & they are always from motors produced before 1974 & these can be identified by the engine No. being in front of the dizzy." Unquote
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 3K head to 4K block, wher from here
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Mon, 06 September 2004 04:50
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further to that
22010 is K bigport
24010 is 3K bigport.
the main difference is 30mm diameter intake ports vs 27mm ones (or 25mm on some motors!!)
bigports also have o-ring valve seals (and a corresponding dual groove valve) and are not suitable for higher lift cams. change over to normal single groove valves and their corresponding retainers and all good. might want to change guides to accept stem seals if you are getting reco'd..
my local does reco for about $130. (sydney clutch and brake)
Cya, Stewart
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