What Rb head will fit?

[lovenismo]

Hey guys! Out of the rb series blocks are any of the heads intercahngeable like the rb26 head on the rb25 block, Ive seen it done on maggela but no info. What about the rb26 or rb25 head on a rb20 block. Any useful info is greatly appreciated! Thanks in advance

[574-240sx]

There is a RB section in the skyline forum. You will get a better response there.

It can be found here http://nicoclub.com/zeroforum?id=135

[Joe]

they are not interchangable. (at least the rb26 and 25. machine work is required to make it work)

[Yellow4g63]

Fito said his buddy put a RB25 head on a RB20. You never know what can be done with time and some money.

[lovenismo]

Today I just seen a R32 gts-t at Fred Meyers. Check out my other post in the 240/Silvia general chat! I need someone knowledgeable in this area and any input will help.

[themadscientist]

RB20 bore =78mm, RB25/26 =86mm. Putting a head with an 86mm combustion chamber on a block with a 78mm bore sounds like a bad idea unless you plan on welding up and reshaping the chambers.

[BoostFab]

Hey guys! Out of the rb series blocks are any of the heads intercahngeable like the rb26 head on the rb25 block, Ive seen it done on maggela but no info. What about the rb26 or rb25 head on a rb20 block. Any useful info is greatly appreciated! Thanks in advance

what are you trying to really accomplish by doing this? it's not worth the effort, IMO.

[lovenismo]

Im WAY far from being a mechanic, but from what I understand a better flowing head (like the 26) will increase the potencial of the motor. About the bore, Im tracking themadscientist, thanks for lacing my boots on that. What I really was trying to accomplish or see really could I put the 2.6 head on the 2.0 block. ( yeah I know, smells like a ****ty noob ?) But the aftermarket would be incredable and those rice dudes would think I really have a GTR engine. (YEAAAHH!)

[Joe]

Im WAY far from being a mechanic, but from what I understand a better flowing head (like the 26) will increase the potencial of the motor. About the bore, Im tracking themadscientist, thanks for lacing my boots on that. What I really was trying to accomplish or see really could I put the 2.6 head on the 2.0 block. ( yeah I know, smells like a ****ty noob ?) But the aftermarket would be incredable and those rice dudes would think I really have a GTR engine. (YEAAAHH!)

wait wait wait

"those rice dudes"? yet you want to put a RB26 head on to make people think its a GTR? uhh pot, meet kettle. "hi kettle, im black too"

the amout of money you will spend to make a 26 head work it would be easier to have the RB20 head ported.

[themadscientist]

Kamin makes a valid point but I won't hate. I will tell you a much easier route to what you want. First, the RB20 head is good enough to get you 400hp before it is resrictive enough to be a problem. If you want the RB26 LOOK the valve covers, timing cover and coil pack cover drop on. Paint them red and it just became an R34 engine! Put on a nice turbo kit and Greddy intake, restamp the block and yoy better have the RB20 pushing at least 350hp or the first time you run it the charade is up and guys in automatic hondas with shift light tachs clowning on you. IMO it's better to keep it real and have a worked RB20 than a fakie RB26. It's like screwing an ugly chick out of desperation, you get a nut but you lose your self respect.

[lovenismo]

Well Id hate to have the look without the go, thats where the rb26 heads aftermarket support comes into play. Thanks for you guys input. Im going with the rb20 for sure. Im sure yall have seen Megalla's website right?(very informative and part of my motivation for this question) Check out the sedan with the 26 head on it. (R34 gtst)

[BoostFab]

Well Id hate to have the look without the go, thats where the rb26 heads aftermarket support comes into play. Thanks for you guys input. Im going with the rb20 for sure. Im sure yall have seen Megalla's website right?(very informative and part of my motivation for this question) Check out the sedan with the 26 head on it. (R34 gtst)

honestly, you can do whatever you want with lots of money. you need to set your budget : goal proportionally---unrealistic ideas will never get anywhere.

if i were you, why the h-ll waste a good r26 block to use the head only, as who would sell you only the head w/o the block nowadays. you said you want the go and the look.....here's a better suggestion, find someone with an rb30 block, mount an rb26 head on that and you will be among the very few to have that setup....oooh maybe make it to the magazines lol....

[lovenismo]

The rb30 block however its built would destroy the balance of the s13. Who knows the weight of a completely built block say with a dohc on it. The ls1 would be a better choice if you didnt mind another type of powerplant. Now supercharge that... Uh Oh rb30

[BoostFab]

The rb30 block however its built would destroy the balance of the s13. Who knows the weight of a completely built block say with a dohc on it. The ls1 would be a better choice if you didnt mind another type of powerplant. Now supercharge that... Uh Oh rb30

the rb30det isn't significantly weight more than the rb25...once you reach the certain power level, those miniscule weight difference isn't the main concern, your traction will.