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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,052 Posts1,055,724 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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| | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | My nephew just had his 2004 Colorado 5 cylinder rebuilt (355k miles) and the shop sent the old pistons back. I was amazed by the tiny piston skirts; probably about a half inch below the bottom of the wrist pin. I have read that they fit some new engines with such close tolerances that 5wt oil is recommended so I guess with fitment that tight piston rock is not a concern. Still scary to look at.
Evan
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