<< 30 years experience in performance cars worked as a fabricator on a few major race teams here in Australia and actually took the time to fill and measure 7M pans to arrive at the 1qt safe overfill suggestion instead of just pulling information out of my arse like most of the "net mechanics"....
The spiral groove thing was something I suggested on SF a few years back to drag some lubricant into the Thrust ;)
I have a 3 axis Bridgeport Clone CNC here at home but as I don't use the 154 I've never given it more than a passing thought just figured I'd jump in and head off your post...
It makes for a very responsive snappy motor but leaves NO ROOM for error 1 tank of crap gas WILL ruin your day if you don't have a strategy in place to deal with detonation.
Just not worth the risk for me.
Really well constructed and thought out post that totally misses the issue at hand due to incorrect base information....
The Thrust Washer is Sintered material and this is THE only reason they fail when subjected to impact loads.
For anyone that's wondering Sintering is taking Metallic...
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