3k Head Mods

[snot35]

G'day everyone,

 

I'm mucking around with the head on a 3K, can anyone tell me what the normal height from head gasket face to cam cover gasket face is? How much can these heads be shaved?? It's a later type head with the normal style valve retainers, and tiny 25mm intake ports!

 

Soon to change though ;)

 

Anyone know what the seat pressure of stock springs is?

 

Cheers

 

Mike

[jamesrolla]

ive got a bigport head and it has aparently been plained down 80thou, will have to see how it goes on my 5k,

[aidaniel[RL]]

isnt the 5k a dished motor and the 3k bigport a flat top???? :D

[Robert]

Not all 5ks are dished

 

All 3ks are flat tops

[jamesrolla]

my 5k is flat top

[old corolla bloke]

G'day everyone,

 

I'm mucking around with the head on a 3K, can anyone tell me what the normal height from head gasket face to cam cover gasket face is? How much can these heads be shaved?? It's a later type head with the normal style valve retainers, and tiny 25mm intake ports!

 

Soon to change though :D

 

Anyone know what the seat pressure of stock springs is?

 

Cheers

 

Mike

 

in the past Ive shaved 100thou from one of the later 3k heads then the bastard pinged its butt off until I put a bigger cam in and twin webers........probably still pinged but i couldnt hear it. try about 70 thou as a start

 

old corolla bloke

Edited May 24, 2007 by old corolla bloke

[snot35]

Thanks all, that's pretty much what I had in mind.

 

Any ideas about the springs?

 

Cheers

 

Mike

[chrisandliz[RL]]

Thanks all, that's pretty much what I had in mind.

 

Any ideas about the springs?

 

Cheers

 

Mike

 

this is all i can do

hope this helps

Edited May 25, 2007 by chrisandliz

[Felix]

ive got a bigport head and it has aparently been plained down 80thou, will have to see how it goes on my 5k,

 

A head that gives 9:1CR on a 3k, would give around 11:1 on a flat top 5k. Even more if skimmed. :D

[snot35]

this is all i can do

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hope this helps

 

Thank you very much!!

 

That's brilliant, you have a factory manual?? Do you the head height limits??

 

Thank you again, that's great.

 

Mike