Date registered: May 2013
Vehicle: 1961 190SL
Location: Northern California, USA
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
"There are also lots of folks who would say "you substituted WHAT" for the correct part? If an engine was rebuilt, I certainly would be interested to know where the parts came from and in my mind the car would not be worth as much as one that had been done using OE or OEM parts."
Because I grew up in the Southern California car culture I have a different opinion of using non-original parts. Here a just a few of examples of non-original parts being an improvement in cases where they are an upgrade in quality and/or performance:
Forged or hypereutetic pistons instead of cast pistons.
Forged instead of cast crankshaft.
Moly rings instead of cast iron.
Pocket ported heads instead of stock to remove sharp edges, protruding valve guides and other obstructions in bowl areas.
Carburetor(s) correctly jetted for optimum air:fuel ratio instead of emissions legal lean jetting.
The list can go on and on.
In the cases of pocket ported heads numerous tests and "seat of the pants" driving impressions prove beyond any doubt that this yields noticable perfromance gains in the low to mid RPM range that street engines are operated in with no adverse side effects. The cutters that are used to machine valve seats in production heads leave sharp edges and casting flaws that interfere with laminar flow. What's to not like about improved performance that is available if a guy is willing to spend some time with a die grinder doing what the factory didn't finish?
In the 1970s I raced a 250cc Suzuki motorcycle in organized off road racing on the California desert. There were problems with the OEM Suzuki piston rings damaging the cylinders. It turned out that forged Mahle pistons with dykes rings from Maico 250's fit in the Suzuki and solved the problem.
Both racing and street rod building embrace the "better mousetrap" concept that also works equally well in daily drivers.
My carbureted cars deliver both better fuel economy, cooler running and more power with properly jetted carburetors. Again, what's to not like about that?