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[rwd-starlet]

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Edited September 19, 2019 by rwd-starlet

[camerondownunder88]

Hi,

I have done this mod my self and can say worth doing as yes a bit more oomph can be given back into your 3K. I have a 3K big port head on a 4K.

 

As for valve seals early K motor heads has shit stem seals so oil did get into the inlet ports after the guides wore down. Later KE30 upwards stuff got the better seals that actually stop the oil. So try using a later 3K head out of a KE30. But the later valve seals can be retro fitted and the newer valve guides to early heads eg you have a big port head you want better seals on so if you want to spend some $$ do this.

 

As for valve size. Yes K motors had smaller valves (K, K-B, 2K). So if you get an early head it could have smaller valves and shit valve seals so better to shave the 4K head. But if you get an early head with smaller valves you can put the larger ones in. I have a big port here machined out to run larger valves out of the later K motors like KE70 etc. There not to much bigger but every mm counts I guess.

 

Also you can think of it this way. 3K motors came out in the KE30 last. Those cars are now old. So motors and heads off them after sitting at wreckers in the open etc usually are corroded up and crap and crack etc. So in the long run shave your 4K head that would be my option. As smaller port size to a degree gives faster air velocity with increases torque of a piston motor. This is why the later heavier corollas went away from big ports as they needed more torque. So my opinion is to shave the 4K head.

 

Also post up pictures of your starlet. Is it a KP61?

 

Cameron

Edited December 7, 2007 by camerondownunder88

[Felix]

The ONLY motors to have smaller valves were the original K and K-B (1077cc) motors. Not sure about 2k's as we never saw them in australia. ALL 3k's, 4k's and 5k's share the same valve size.

 

So try using a later 3K head out of a KE30.

 

A ke30 3k head is exactly the same casting as a normal 4k head. The only difference is a 3k head is skimmed a bit more. rwd-starlet could simply skim his existing head to achieve the same effect. That is unless he has a dished piston 4k-e EFI motor in his starlet which would make all the earlier heads incompatible unless he want's to decompress his motor.

Edited December 7, 2007 by Felix

[camerondownunder88]

True Felix. I will edit my post. Just a 3K big port head I have here at home does well did have the smaller valves in them until the later larger ones were installed so must of been an odd 3K big port factory..LOL But not to worry.

 

According to a parts catalog I do have but the 2K did share the same valves as the K and K-B motor Felix so I am pretty sure 2K have smaller valves.

 

But if he does use a 3K head we did forget to mention don't mixed a dished piston cylinder head with a flat top piston bottom end results will not be pretty.

 

But 3K-H had higher compression than a 3K-C here in Aus so try also getting a 3K-H head as it will be shaved more than a normal 3K head.

 

Cameron

[rwd-starlet]

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Edited September 19, 2019 by rwd-starlet

[Redwarf]

True Felix. I will edit my post. Just a 3K big port head I have here at home does well did have the smaller valves in them until the later larger ones were installed so must of been an odd 3K big port factory..LOL But not to worry.

 

According to a parts catalog I do have but the 2K did share the same valves as the K and K-B motor Felix so I am pretty sure 2K have smaller valves.

 

But if he does use a 3K head we did forget to mention don't mixed a dished piston cylinder head with a flat top piston bottom end results will not be pretty.

 

But 3K-H had higher compression than a 3K-C here in Aus so try also getting a 3K-H head as it will be shaved more than a normal 3K head.

 

Cameron

Cameron, if it was my old head, it was a k head......

[camerondownunder88]

Red,

Actually it is another head I picked up. But it was corroded way to far :D So was the rest of the rust in the for of a car around it..LOL so it went to the scrap bin but from what I could identify and the other half of the bottom end that was on it it was a 3K head with smaller valves go figure. Now the corolla was old so straight up in 30-40 ish years yes parts can change so I wont say some 3K heads did have smaller valves I wont put money on it but that is a case I have see so just keep an eye out I guess as can't afford to lose those valuable KW in a K motor now..LOL

 

Also how cool is your car. Fav model in the starlet rang for that car. Wish we could get them easily here in Oz light economical easy on parts and with a 5K do boogie :(

 

Cameron

[rwd-starlet]

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Edited September 19, 2019 by rwd-starlet