Pettis Performance 598Ci Race Engine Enlarged Lifter Bores
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Not only was the lifter bore enlarged, Pettis also moved it over 0.050-inch. This accomplishes a few things, first is that it allows room for a larger pushrod without having to ruin the heads. Secondly, the modification allows for a slightly straighter pushrod angle. Both are critical to running higher rpm levels while still maintaining valvetrain reliability. View Related Article
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