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I know that all '73 240Z's had engines with 9mm rod bolts. However, when I find a '73 in the junk yard, how do I know the engine is a '73 engine. What I would like to be able to do is look at the block, and determine from the serial # whether the engine had 9 mm rod bolts. Doe anyone know what range of block serial numbers I should be checking?
 

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> I know that all '73 240Z's had engines with
> 9mm rod bolts. However, when I find a '73 in
> the junk yard, how do I know the engine is a
> '73 engine. What I would like to be able to
> do is look at the block, and determine from
> the serial # whether the engine had 9 mm rod
> bolts. Doe anyone know what range of block
> serial numbers I should be checking?

Per the Nissan Motorsports catalog, L24 engines up to serial # 96180 have the 8mm bolts, engines 96181 and up have the 9mm bolts. Mine's a 72 built in 3/72 and my engine has a 1xxxxx serial # so any of them in a 73 should be the 9mm bolts. Based on the serial #s I think the last 8mm rod bolt engine probably rolled off the assembly line around december of 71. (give or take)

So basically I'd say as long as the engine you buy has a 6 digit serial # you should be fine. (If you're going to replace them, I'd recommend the ARP replacements rather than factory. They are much much stronger and don't cost a whole lot more)
 

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> Per the Nissan Motorsports catalog, L24
> engines up to serial # 96180 have the 8mm
> bolts, engines 96181 and up have the 9mm
> bolts. Mine's a 72 built in 3/72 and my
> engine has a 1xxxxx serial # so any of them
> in a 73 should be the 9mm bolts. Based on
> the serial #s I think the last 8mm rod bolt
> engine probably rolled off the assembly line
> around december of 71. (give or take)

> So basically I'd say as long as the engine
> you buy has a 6 digit serial # you should be
> fine. (If you're going to replace them, I'd
> recommend the ARP replacements rather than
> factory. They are much much stronger and
> don't cost a whole lot more)
Also the L24 on the early blocks is stamped in a scripted lettering rather than the one your used to seeing.
 
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