Jump to content

What Parts Are Interchangeable Between 4K And 5K Engines?


#QLDke10#
 Share

Recommended Posts

Hi Guys,

 

Trying to find prices for 5k parts to decide which direction to go on my build as have looked at a 5k Short motor but not sure what i can use off the 4k i have and what will be easy to find and what will be hard to find!

 

Without prices i am having trouble deciding which way to go, so list of what i think i would need for the 5k is below any help on what i can salvage while finding new parts and what would be easy / hard to find would be great.

 

Timing chains and gear

Oil return - Think i can use 4k

Sump - think i can use 4k?

Gasket kit - $60 ebay

Valves / Springs / Rockers - Have complete 4k head and 3k head only

Push rods - use 4k?

Timing cover - use 4k?

Rocker cover - i can use 4k

Pulleys

Thermo and thermo housing

oil filter mount (not sure correct name of this) - use 4k?

Engine mounts - have new 4k

Intake - lynx manifold and twin su's already have

Cam - regrind a 4k one or are they different?

Alternator

Distributor

Starter motor

Flywheel

Water pump

 

Anything ive missed that you know i would need please add!!

 

Also any recommendation for engine builders in Brissy would be great

 

Thanks in advance. Paul

Link to comment
Share on other sites

Members dont see this ad

By short motor, do you mean you have a block with the head and nothing else?

 

If you have the head, other bolt on's should work well. If it's missing the head I probably wouldn't bother, as there are some pretty major differences between 4K and 5K setups (generally) in that regard. e.g. push rods and rockers may not be compatible.

 

Have a decent search through this forum, there is plenty of detail in here about the differences.

Edited by snot35
Link to comment
Share on other sites

  • 2 weeks later...

why?

 

Why would you spend a bunch of money to make a 4k block take 5k pistons that wont work with the head that comes with the 4k anyway, and you've spent 3 times more than a 5k anyway...... Plus sacrificing block integrity by machining the shit out of it....

 

In an effort to actually answer this gentleman's question:

 

Timing chains and gear - Yes it will fit. 4k ones are better than 5k

Oil return - Think i can use 4k - Yes you can

Sump - think i can use 4k? - Yes. 3K ones wont fit.

Gasket kit - $60 ebay - Head gasket might not work with the bore diameter. Buy a 5K one.

Valves / Springs / Rockers - Have complete 4k head and 3k head only - Nine times out of ten your 5k is a dished piston. Which means you need the correct head and valves and springs. Best valve springs for a 5K performance setup are probably crow cams 4220s. Forget the bullshit about kingswood springs and glockenspiel retainers etc.

Push rods - use 4k? You should get a 5k head with 5k rods..

Timing cover - use 4k? Common to all

Rocker cover - i can use 4k - Common to all. Early k/2k/3k ones are the nicest looking with less mounts on the top.

Pulleys - Depends on your water pump. There are 3, possibly 4 different water pump pulleys, so you need to make sure everything matches. This is the last thing you should worry about.

Thermo and thermo housing - Interchangeable. Depends what inlets/outlets you need for the car, swap your 4k one over for EASY

oil filter mount (not sure correct name of this) - use 4k? - Same

Engine mounts - have new 4k - Same

Intake - lynx manifold and twin su's already have - Same

Cam - regrind a 4k one or are they different? - Depends on whether you are running hydraulic lifters, they have different grinds. Dumbasses will tell you that you need to go solid, so you will spend your weekends trying to match Mercer Raceabout lifters to Studebacker rocket covers. Don't.

Alternator- Interchangeable, but depending on the belts and pulleys (see water pump comment) you need to make sure your alternator bracket (top one) and the belt length is correct. Not hard though.

Distributor - Interchangeable.

Starter motor - Interchangeable, biggest issue is the headers.

Flywheel - 5K ones are different. I can't remember why.

Water pump - See above comments. All are interchangeable, best to just swap pump/pulley/crank pulley/alternator/alternator brackets off your 4K for EASYFUNS

 

in summary, most stuff will swap over but the head and valvetrain will cause you more grief than is necessary.

 

5k's are not rare. Both of mine cost me 100 each. full motors in pieces. hold out for a complete one and swap the fruit, or chase down a head to suit your short block

Edited by philbey
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...