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Hey what is the best block to match with a e-31 to get a lot of HP I have heard of the F54 or what is the best???

Dustin Morris
 

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It depends on what your application is. If it is all out race, stick with a 75-78 280 block. They are known for their high nickel content which is helpful for longevity in racing. But for any dual purpose or street application, it doesn't really matter. The F54 is stronger to an extent, but it really is only required in the 3.1 engine, because of the large overbore, which correspondingly weakens the block. An E-31 head is a little small for a 280 motor. If you can find a good N-42, that would be your best bet. It has larger valves, and good flow characteristics
 

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Compression w/f54 n42

What would be the compression ratio witht the f54 block and the n-42 head if both were stock and what could you do to raise the compression to between 9 and 9.5. Thanks

Sam 75 280z
 

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with flat tops you are already there

> What would be the compression ratio witht
> the f54 block and the n-42 head if both were
> stock and what could you do to raise the
> compression to between 9 and 9.5. Thanks

> Sam 75 280z

Flat top pistons and an N-42 head should give you the compression that you are looking for without any further mods. This is a common combination which will soon find it's way between the fenders of my 82 N/A.

Ken
 

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with flat tops you are already there

> What would be the compression ratio witht
> the f54 block and the n-42 head if both were
> stock and what could you do to raise the
> compression to between 9 and 9.5. Thanks

> Sam 75 280z

Flat top pistons and an N-42 head should give you the compression that you are looking for without any further mods. This is a common combination which will soon find it's way between the fenders of my 82 N/A.

Ken
 

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Take a 75-78 L28 block. Add forged flat-top pistons from the ZX. Stick with the square port N42 head from 75-76 - especially if your thinking about turbocharging later. Otherwise you could also use the N47 round port head from the 77 & 78's. Either, combined with the flat-top pisotons will give a compression ratio around 10:1. A healthy jump from the stock 8.3. Add a decent cam - 250-270° duration with .500-.520 lift. Leave stock exhaust manifold and AFM and just add K & N and a 2.5 exhaust. Will give you a real lively engine for a reasonable investment.
 
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