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View Full Version : APR Valve Spring System in a 4.0T engine



GTM Bandit
01-09-2018, 06:18 PM
Does anyone have any info on APRís Valve Spring System for a 4.0t? More importantly what would be the projected rev limit with this system?


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rjabba88
01-15-2018, 08:16 AM
According to APR the valve spring kits are good for eliminating valve float well beyond OEM Redline. They dont list any sort of RPM range for it. they only list weight reduction and spring Tension. I would say Call them, and see if they can give you numbers.