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Too much overlap makes the engine run poorly at 1800 rpm even if it has a 4.25 stroke.


Truer words have never been spoken. Add EFI to the mix if you really want to add insult to injury.

Mine has an MP509 with a 4.15 stroke. It did have 1.7 rockers. It seriously swung the torque needle at 1500 and was at 500 ft/lbs by 2000 but was seriously not happy at part throttle anywhere in that range with TBI.

When I find something else to put it in I think I'm going to look at something similar to the MP528 but with a tight lash or hydraulic lifter. It has a fairly wide LSA, 114? Andy can testify to what it can do compared to "modern" grinds. Seems like a decent choice for a mostly street application if you have a full quiet exhaust system and need some manifold vacuum.

Kevin