Thanks for the following comments: "BUT back then the rebuild kits came thru with FORGED pistons . Now a new rebuild kit comes with a CAST Aluminum piston and a cast piston will not transfer heat from the top to the skirt as fast as a Forged piston will and it will swell more above the top ring due to heat . The difference between the skirt and where the rings set runs about .019 -.021 smaller then the skirt , and when these engines are working the heat from this new gas burns way hotter then the old gas did thus the cast piston can and will swell over .025 -.027 . and this will lead to a seized engine and this happens above the top ring." end quote.. ------------------------------------------- I had one of the 1700 or so new 1965 Corvettes sold to the public with the highest performance 396 ever built. One big reason advertized was that it had Forged pistons when the lower rated 396 in Camero had cast as well as other lower cost parts. Mine was factory Redlined at 6,400 and most took it much higher and for long periods of time. Now I know more why my 396 was considered one of best built high HP/high RPM engines GM sold to the public back in '65 thanks to your comments of heat transfer in cast vs forged pistons. It would be interesting to hear more on other designs in that '65-'66-'67 series of Corvette highest HP engines. ag
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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