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Is it suggested to build a motor with ARP main studs. One item of consideration is whether the machine shop can do line boring. How many have done ARP main studs and line boring?


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It is good practice but only needed if you plan to increase the torque spec above stock.

Im running arp mains with stock spec
 

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Its a good idea because of the way that studs torque down verses bolts, but for MOST it isnt completely necessary. However considering the cost of building an engine and all the parts, I dont see a reason not too.
 

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I think it is completely unnecessary on a Miata motor. Pretty much nobody does it - just check with all the most popular Miata engine builders.
 
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