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Originally Posted by regalman4925
(Post 4666712)
That's not what the mercruiser manual says as my first post had in it. They are forged quicksilver labeled GM pistons that are the exact part number that mercruiser specs out. Am I looking at the wrong info?
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Were the factory pistons forged?
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I will get pictures of the pistons tonight.
The manual is 1997 and listed both carbed and EFI info. The rotating assemblies are a mid to late 90s when new, both are going into gen VI blocks. If I recall correctly, the date on the piston boxes is late 1996. I am not sure if any of that makes any difference but in my mind the manual was correct for when all of my parts are from. I am going to look around some more online today and see if I can find any other merc specs that may be more current. thanks for the help so far guys |
my diamonds are all .008-.0085. i dont have any piston knock ever and no blowby. these are also probably a better forged material than mercruiser and require more room to grow. not sure if this helps at all just showing that you can open them up pretty good and its ok.
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They Look like cast pistons |
If they are cast then mercruiser is passing off cast as replacement for the 454 mags, 420s and hp450s. That would surprise me
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Mercruiser where sneaky feckers in the mid 90's by branding some of their 4 barrel Carburetor engines "MAG" engines. |
That was actually back in 87-88ish if I recall correctly. I am fairly certain these are forged. The machine shop told me they were trw forged. Maybe we are all mistaken
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Your right they are forged TRW pistons from a LS6 1970 454. Sorry for the confusion but yeah they do look nasty 😷 |
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