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30 block are cheap as.

but i would like to know the ans to this question also

is it due to the longer stroke which can smash the piston into the valves???

and how high would the head need to be raised to prevent this?

the tomie rb30 uses the 26 block with 3.0L crank so why isnt this possible to do yourself???

Edited by humz
hhmmm, interesting. Keeping an eye on this thread.

Have a look about 6 months ago.

Guy did it, wouldnt go into much detail so its safe to assume one of two things

1. He was talking shit

2. Is cost a lot of time, and money and probably isnt worth the effort

Plus, when a 26 crank works just fine, not sure why you would bother

As you know I want to but RB30 Crank because it has longer Stroke is more than RB26 Stroke, I mean if I can use RB26 Conrods because it's short and I think it will give me more renovation.

Edited by Supra2000

I think these forums need to be IQ means tested.

Lets look at the stroke of the following

rb26 86 x 73.7

rb30 86 x 85

Now thats the stroke - thats the distance the piston travels from the bottom of the bore to the top of the bore.

So the Rb30 travels 11.3mm overall more - divide that by 2, as half is at the bottom and the other half is at the top - so from basic maths the rb30 stroke is 5.65mm more than the rb26 at the bottom and at the top of the stroke.

So if you were to install a RB30 crank into a RB26 block, you would end up with a stroke that sticks the psiton 5.65mm higher than the RB26 crank - now this couldnt be good for your piston to head clearance.

So you would either have to use a custom piston or a custom conrod to make this work.

It would be a lot cheaper and easier to buy a RB30 4wd adaptor plate and bolt that in your GTR

As you know I want to but RB30 Crank because it has longer Stroke is more than RB26 Stroke, I mean if I can use RB26 Conrods because it's short and I think it will give me more renovation.

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