GJM85

If you going to spend the $160 on a cam, you'll need new lifters or have the current lifters refaced. There's another $100. You'll want do your timing gear aswell if it's not fresh. There's $140. It's likely your lifters will end up in the sump when you try to get them out so there's $15 for the gasket and $30 for new oil. It's also likely that they won't go back in through the head, so it will come off and you'll spend $100 having it skimmed plus the $170 on the VRS kit to get it back on. If your cam is real big, you'll need your dizzy regraphed for around $300 You'd want to be real good to get away with a clean cam swap.

Many people belive its not worth the trouble. At higher rpm hydraulic lifters begin to pump causing misfire. Though solids will cause valve bounce if their not set up correctly. A balance of must be found.

I feel bad for going here. But.....

It get frustrating when people refer to a shallow dish piston as a flat top. It's not the case, ask Taz.

Yeah, nearly. i've done a full service, replaced the gearbox and diff oil, bled the brakes and replaced the pads. New battery terminals and clamp, dashmat, tyres, replaced the carby, rocker cover, ignition leads and boot seal. I've cut the rust out and dad is in the process of repairing it. The sump plug is now leaking badly, the front brake cylinders are poo and it still runs a little flat. Slow progress.

The twin squish head goes hand in hand with D-dished pistons. I have O dished pistons without twin squish and hydraulic lifter. A combination not on your list. And yes the pushrod length is the critical mass that makes or breaks it.

ok i'm doing some research. So far i've found we have the two different 5k engines. If the head with lugs and block you have are orginal you apparently should have a 5k, solid lifter, D dish piston and twin squish head with adjustable rocker gear. I have the 5k, hydraulic lifter, O dish piston and nominal head with non adjustable rocker gear. If i'm correct.... The combustion your 5k occurs lower in the cylinder bore. Larger piston dish with smaller combustion chamber in the head. The combustion in my 5k occurs higher in the cylinder head. Smaller piston dish with larger combustion chamber in the head. There are also differences in the lifter depth (how deep the pushrod sits in the lifter) and the length of the pushrods. My pushrods, without measuring them are 155-160mm long and have ball ends. Your pushrods should be 179mm long with ball and cup ends. I'm beginning to think you have the 5k solid motor and the previous owner has either purchased the cam or ground to suit the 5k hydraulic motor.

yeah i mean the counterweights... they contact the piston sleaves and a shorter piston may not rectify that issue.

Using a 4k crank and 3k rods it could be as simple as having the crank lobes machined down a few millimetres and use shortened pistons. You could call it a 3k stroker kit.

Yeah apparently they carry the same part number which would make them the same part. I looked into it though various parts suppliers and was unable to confirm or deny it.

It's your lucky day.... i've got the pushrods and rocker gear you need. You'll need new lifters though.

No they will not. You will need to work out what type of pushrods and lifters are in it. The 5k hydraulic set up has short pushrods with balls on both ends and the rocker gear is not adjustable. The issue comes down to the depth the pushrod sits in the lifter. There are only 2 types which fit. Holden/Chev lifters or the rarely spare 5k solid. It could also be a gutted 5k hydraulic. The pushrods could either be modified 3k/4k pushrods or Datsun pushrods. You need to convert the lifters, pushrods and rockers back to standard. Or get the cam reground. Also, with out knowing the extent of modifaction done to the engine, it is difficult to assume it will be that simple. For instance, if the rocker towers have been machined or if the block was decked that will change things.

As with most K motors the majority of combustion occurs in the cylinder head. Adding the extra 12mm to the 66mm stroke of the 3k would see your piston top leaving the cylinder bore. You would need shortened pistons or conrods or both.

Tight Engineering recommended the 104 cam for my set up as I would be running a low boost application, but would also be suitable of a NA set up.

That may have had something to do with the lift of your cam.

I do plan on blowing the 5k. Think of it as building for the future. 4k and 5k have the same crank...

my brother put silvia front end into his ke70 and has since given up on the project..... ae86 coil overs, silvia brakes, control arms and ae71 crossmember. not sure what else.

You were selling all your T motor gear... so I thought you'd quit. Never heard of the expression "getting the hell out of Dodge"? Dodge being a town in Texas, USA.

I got one out of Southport Auto Recyclers for 375 doi! So i'd say the wreckers....

I thought you were selling up and getting the hell out of Dodge....

3k/4k/5k heads don't fit on 7k blocks and i'm not sure about sumps either. It may require a crossmember/engine mount modification.

custom made shit man. always costly.

correct. though a 3kb head would be better still.

Very cool ride man, but I don't think EOI's fly around here. Your either selling or your not. If you were and I wanted it i'd offer you $3000-$4000 for it only because it would cost me $1000 to get it shipped up to QLD. I'd say imported or a prize car from the '82 Wheel Of Fortune!!!!!!!

My 5k going into my ke20. >from sump to carbs. 1988 liteace 5k block 4k sump shimmed oil pump 4k crank 5k conrods ACL bearing kit ACL shallow dish pistons Tighe 104 cam 25/65, .278 deg, .411 valve lift. Pro Torque twin timing chain Holden solid lifters A12 light weight pushrods 4k rocker assembly 5k valve springs 4k valves 4k head with port and polish wrapped Hurricane shorty 4-1 tube headers redline intake manifold twin 40mm Mikuni Solex sidedrafts, 40mm ram tubes, Redline air socks 4k fuel pump 3/8in fuel lines Racer water pump electronic dizzy GT40 coil top gun leads NGK plugs 4k flywheel Exedy Sports Tuff HD clutch ....it's built, just waiting for the car to come home to me. No idea what the output will be. I will likely bolt the sc12 up in the future....