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Old 04-03-2007, 09:09 AM   #11
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Keep in mind the S1 and S2 pistons are not the same. The topic author has a S1. Those vendors may or may not support the S1 (which has two different pistons depending on year).
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Old 04-03-2007, 02:30 PM   #12
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Quote:
Originally Posted by clm2112
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Originally Posted by TrueWildMan
Another option you might consider is hypereutectic pistons. They're quite a bit lighter, but are also quite a bit more expensive. I would suggest only using these pistons with lighter rods, H-type erhaps.
The OEM pistons are "Hypereutectic"..High Silicon cast aluminum alloy. Only upgrade would be going to forged pistons. Diamond being the only one off-the-shelf maker of forged 3800 pistons. JE and others will do them as a custom order, but at a very expensive price.

The least expensive pistons are Sealed Power (Dana) replacement pistons, available in overbores, and they are coated like the GM stock pistons.
That'* strange, then. There are some that have gotten them, and they were noticeably lighter than OEM... Hmm. Oh well.
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Old 04-03-2007, 02:43 PM   #13
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Sorry to go off topic but are you rebuilding it with the cam from seriesoneperformance.com?
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Old 04-04-2007, 08:17 AM   #14
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Quote:
Originally Posted by willwren
Keep in mind the S1 and S2 pistons are not the same. The topic author has a S1. Those vendors may or may not support the S1 (which has two different pistons depending on year).
My mistake, I went back and looked at their 2007 catalog. Diamond only has L67 and Buick T-Type pistons listed, nothing in the middle.

So, in the forged catagory, nobody is making a S1 as a catalog item. Based on the quotes I received for custom pistons, the price on a set of forged S1'* would be in the $800 range.
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Old 04-04-2007, 08:38 AM   #15
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Quote:
Originally Posted by TrueWildMan
That'* strange, then. There are some that have gotten them, and they were noticeably lighter than OEM... Hmm. Oh well.
You can't tell if it'* Hypereutectic by it'* weight. The difference in silicon content is only a few percentage points. (from about 12% for a standard cast aluminum alloy piston to about 16% for a hypereutectic alloy piston.) IIRC GM switched to high silicon pistons in new motors in the mid 1980'*...about the same time as the compression ratios on stock motors started to creep back up.
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Old 04-04-2007, 02:45 PM   #16
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Quote:
Originally Posted by clm2112
Quote:
Originally Posted by TrueWildMan
That'* strange, then. There are some that have gotten them, and they were noticeably lighter than OEM... Hmm. Oh well.
You can't tell if it'* Hypereutectic by it'* weight. The difference in silicon content is only a few percentage points. (from about 12% for a standard cast aluminum alloy piston to about 16% for a hypereutectic alloy piston.) IIRC GM switched to high silicon pistons in new motors in the mid 1980'*...about the same time as the compression ratios on stock motors started to creep back up.
I see! Thank you very much for the explanation! I really do appreciate it.
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