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4k-c Head Mods

Featured Replies

ok what over size valves have u guys fitted & any mods to the valves to fit them & how much should i get the head shaved to give 9.8 to 1 please

  • Author
ok what over size valves have u guys fitted & any mods to the valves to fit them & how much should i get the head shaved to give 9.8 to 1 please

 

aw come on someone must kno :jamie:

no idea with oversized valves. nothing is a direct fit. not worth the effort for a street engine in my opinion. not on a 4k anyway. just get a 3 angle seat job.

 

measure your combustion chambers to work out what CR you have now (taking head gasket thickness into account). from there you should be able to work out how much you need removed.

  • Author

cheers Felix ..

have u thought about just puttin a 3k head on it..it'll up compression

  • Author

i have a 3K-H head i could swap, whats the comp ratio with the 3K/4K combo please

i thought 3k heads were weak? personally i reccomend getting a belt sander and goin over the head for a while, n try that! haha jk, what motor is it? i think 1/4 a mm mite do the trick, i have no idea tho, just thinking of what ive seen of different thickness head gaskets used on rb engines

  • Author
i thought 3k heads were weak? personally i reccomend getting a belt sander and goin over the head for a while, n try that! haha jk, what motor is it? i think 1/4 a mm mite do the trick, i have no idea tho, just thinking of what ive seen of different thickness head gaskets used on rb engines

 

:lolcry: & do the valve job with a angle grinder . its a 4k motor & i will fit the 3k head (later types are ok ), i want to keep the 4k-c head incase the superecharger thing happens as its 8'5 to 1

there was a head on ebay that had 2lt cortina valves in it i think? might be worth a look.

it was a $500 head and it had SOHC gemini walves, it was full house but it would have made a little K motor scream

 

cheers james

  • Author

ive found a worked 4k head to fit & still keep my original one for s/c later.thanks for the input :lolcry:

it was a $500 head and it had SOHC gemini walves, it was full house but it would have made a little K motor scream

 

cheers james

 

 

yeah thas the one, iwas thinkin of gettin it but lack of cash put a stop to that :lolcry:

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