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well last night i cracked my block in cyclinder 3 right down the bore after making 688hp at the wheels without the NOS on not reved out, the block was a nismo N1 block which we just fitted in after cracking the std one, so looks like the nismo ones are not as strong after all, i was told today that u can get a stronger block called the group a block does anyone have any ideas where these can be bought from?

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it was a std nismo n1 block, but we have weigh the std gtr33 block and the nismo one and there is no difference in weight thats why its got me wondered if there any different, the most i have made is just over 800hp in all four wheels and she was holding.

There is certainly a difference in price between the std (05U) and the N1(24U) blocks!

I thought that the N1 blocks had thicker wall castings (i.e. smaller water jacket galleries) - perhaps the additional metal is minimal in weight?

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He has sourced things for the USA like 1990 300Z complete front ends made new buy Nissan and for me he has some 1987 Century badges coming and Toyota Japan are doing some new ones for us which delayed the bits by 3 weeks.

If Graham cant get the bit nobody can.

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maybe on the new block if its drag race only grout fill it. On the a brand new rb30 we are building we are grout filling the block as well as running chomoly cylinder liners and a custom sump girdle, that lines the inside of the block and join the thin parts of the block to the girdle.

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usally i make around 650hp without the NOS and this time when we where tuning it we played around with cam timing and found more power so it was going for 700 with out the NOS so maybe the nismo blocks arent as strong as everyone thinks they are. im only runing 87mm pistons so there not to big, i might have to look into cyl liners or the gt block which they claim its thicker again but double the price.

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usally i make around 650hp without the NOS and this time when we where tuning it we played around with cam timing and found more power so it was going for 700 with out the NOS so maybe the nismo blocks arent as strong as everyone thinks they are. im only runing 87mm pistons so there not to big,  i might have to look into cyl liners or the gt block which they claim its thicker again but double the price.

Just a question - the new N1 (or standard for that matter) blocks have an 86mm bore. Presumably retaining this bore size would improve strength?

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a few things to clarify

NISMO DO NOT MAKE an N1 Block

NISSAN make the N1 block. It has a higher Nickel content than the Standard RB26 Block and is stronger.

NISMO just realeased their GT Block this year to co-incide(spelling??) with the release of the R34 GTR Z tune. It is the same block used in the GT500 Race Cars.

Gav, increasing the bore size helps you increase the displacement in the engine. Hence why the HKS 2.8L Kit uses 87mm Pistons.

Retaining the original bore size or only going to 86.5mm pistons aids in developing fantastic engine response (not something that is overly focused on in drag setups). Also going to an 87mm bore rasies concerns about the overall strength of the block. It's fine if you run a drag car that gets re-built often but for a street car that need to last, it's an unnecessary risk IMHO.

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