Jm 25/28h

Old May 9th, 2018, 06:26 PM
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Jm 25/28h

I have one of these sitting around. Which lifters and springs should be a good match? 1.800 installed height for the springs.
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Old May 11th, 2018, 10:43 AM
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Spring pressure psi
110-140 @seat
290-340 open

Lifters - your pick - good hdy.
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Old May 13th, 2018, 08:18 AM
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You do know that all of this info is on the Mondello website

JM-25-28 Hydraulic Camshaft

  • Bracket/Jet Boat Racing Cam, 2000-6500 RPM Range
  • 0.523 Intake lift / 0.544 Exhaust Lift
  • 280 Advertised Intake Duration /292 Advertised Exhaust Duration
  • 236 Intake Duration @ .050 / 248 Exhaust Duration @ .050
  • 108 Lobe Separation
Technical Note: Recommended for use with 555-HCR Lifters, SK-240-S (shallow seats) or SK-240-D (deep seats) Valve Spring Kit, TR-499 Timing Chain.
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Old May 13th, 2018, 05:09 PM
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Thanks guys. If I could avoid double springs like Mondellos it would be nice. I called Engle and the rep said he was all out of springs. He suggested single springs with a damper.
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