How To Get More Torque From 540Ci Big Block Aluminum Offerings
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In terms of heads, Dart recommended their 310cc aluminum offerings (PN 19100112, $1,375 each). These rectangular-port heads came with a combustion chamber volume of 119 cc and flowed pretty good right out of the box, but Twedt saw room for improvement. As he recalled, “The Dart heads have a nice heart-shaped combustion chamber that provides good swirl and helps generate good low-mid lift flow numbers. In my experience, the 540 street engines like anywhere from 10.2-10.5:1 compression. With our combination we fell a little short of that, so we milled approximately 0.020-inch off the heads to net us our desired ratio. I also hand-massaged the piston domes and flame-notched them to remove any sharp edges to get us the best flame travel across the piston tops as possible. With this minimal machine work, we ended up with a little better runner/chamber combination, and the 10.5:1 compression we wanted.” View Related Article
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