3K Bigport Head Or Just Shave And Port The 5K Head

[ke20rota]

hey guys just another quick question,

the 5k i just bought has a 5k head but was once running a 3k bigport head and running a 10.9:1 compression ratio.

the 4age pistons have the valve rececces in them so I'm just wondering weather its worth trying to find a 3k bigport head or just shave the 5k head and do a big port on it.

what are your thoughts??

 

cheers again guys

 

 

 

 

 

Not gunna lie, ill probabaly be putting a few topics up but should be right with most things :)

 

do build 600hp diesel motors for a living :)

[coln72]

Stick with the 5k head and mod that.

[altezzaclub]

What are you going to do with the car?? daily to work? Race it? Weekend warrior?

 

Bigger ports mean more top end and worse lower down, so a well-ported 5K will be better unless you're spending a lot of time over 5500rpm.

 

While you're there, how does a car or ute's diesel stop when you turn the key off?? They have no ignition to kill, so do they have a decompression valve like a truck??

[philbey]

Just port the 5k for 150 I had my ports matched to my sidedraft mani and head planed. They ended up bigger than a 3kbp anyway.

[ke20rota]

thanks heaps guys. makes sence i guess haha.

 

yea its gunna be a weekend worrior. my daily is a slammed mx73 on bbs rs' :)

 

I'm not to sure to be honest with u altezzaclub. all i do is the truck motors and they also use a fuel shut off solonoid on the fuel pump.

 

not.quite sure how 4 wheel drives and cars do it.

 

thanks guys :)