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Lot more work and money for a modest gain

August 27 2012 at 7:35 AM

Barry R  (Login Barry_R)

Response to why arent 4.375 stroke cranks more popular?

The 4.375 are only available from RPM in steel and they do need some touch grinding before installation - ends up costing around $400 more than a cast 4.25 once finished.

The pistons are customs and they end up costing an extra $300 to 400 depending on what you started out with

The balancing is no big deal - similar

They do punch the pin through the oil ring - not a train wreck but not the greatest deal on a street car.

They get a lot closer to hitting the cam and they can touch the underside on some blocks - takes more attention during assembly mock-up.

The 4.25 is just a sweetheart of a package in an FE - clean, simple, and effective.

Barry Rabotnick

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