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Discussion Starter · #1 ·
I've got a 1974 260Z with the 260Z head on a 280Z engine block. what I can' figure out is why it won't run right. I can't get it to stop bakfiring and it has lost all low end power. I got the car with this enigine configuration and it ran fine for about 2 months. Could swapping the carbs help. Any help that you guys coul give me would be greatly appreciated. Thanks.
 

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What kind of carbs are you running it sounds like they are in need of cleaning and tuning. Also if they are stock SU's or Hitachi or whatever else Nissan used they might be setup for the 260 or even 240 displacement blocks and could need to be rejetted for the larger displacement 280 block

Later
Matt
 

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Discussion Starter · #3 ·
Sounds like you should do a compression check. Could be your valves were adjusted too tight and eventually burnt a valve.
 
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