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Old 05-23-2007, 10:46 AM
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Piston Identification

Is there any way to identify a piston from the back side? Did the manuafcturers cast different patterns in the back?
I pulled the pan on the '78 454 that I picked up and it is very clean. Must be a recent rebuild.
I would like to calculate the compression but would rather not pull the heads unless it is necessary.
I tried to look thru the spark plug hole with a scope. They are flat tops with small cuts to clear the valves. I can only see one side and can't identify any markings.

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Old 05-23-2007, 06:47 PM
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Some aftermkt pistons (such as SterlingandBadger) have markings cast into the inside shirt area with a number. Some in the outer pin/skirt area (KB/Silvolite) Some etch or stamp the tops (Seal Power/TRW/FED MOG). And then some ink the tops, Good luck!
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Old 05-24-2007, 06:37 AM
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I did some more digging last night. The inside of the skirt is marked with the letters DD and USA. I decided to try the scope one more time and was able to see the P1545 030 on the piston tops. There were two small reliefs for the valves and a small hole on the side. I went onto summitracing.com and found that they look like the Speed-Pro Hypereutectic Pistons. Noticed that the skirt is coated on the web and when I checked mine they were. Tried to search that number on the web but came up empty. Looks like they have several .030 over pistons some are 0cc and some +2cc.
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