TwinTurbo.NET: Nissan 300ZX forum - 4140 cost is almost 2x 1045 with marginally better specs...
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Subject 4140 cost is almost 2x 1045 with marginally better specs...
     
Posted by LitlElvis on August 31, 2017 at 4:06 PM
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In Reply To Why 1045 instead of 4140? If you have a factor of safety of posted by Red Hawk (CO) on August 31, 2017 at 02:31 PM
     
Message I considered going with 7075 aluminum but that's tough to sell to customers who worry about dissimilar metals and their differing thermal expansion rates. Also, many machine shops get squirmy when asked to line bore or hone an iron block/aluminum main cap setup.

Ultimately all of this work is laying the foundation to do a billet or cast aluminum VG block.

     
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