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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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!
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| | | | Joined: Apr 2012 Posts: 135 Shop Shark | | Shop Shark Joined: Apr 2012 Posts: 135 | I have changed the links.
| | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Why not measure them. even an inexpensive digital 6" caliper will give you the answer. | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Even a 6" scale will give you an idea. | | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | I think those are stock, they would have a . and an extra 0, like this .090, at least thats how they are on all of them I have seen, the ones I have in the garage are like that. (well .040, but you get the idea.) But the really best way would be to measure them. | | | | | Joined: Apr 2012 Posts: 135 Shop Shark | | Shop Shark Joined: Apr 2012 Posts: 135 | Thanks brokenhead. I agree with what you say. I have never claimed to know everything, but all the oversize pistons I have seen are usually marked as you stated. I would measure them myself, however my friend is on the other side of the state, over 3 hours drive time away
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | I'm curious as to why you need a friend to measure pistons? If you don't have micrometers look at Shars tool company, I got a set of 1-4" for an incredibly cheap price. I realize it is probably chinese, but for as much as I use them it is fine, and as far as I can tell they are dead accurate. you can spend a $1000 on a set of starret if you would rather, but if you are going to be fiddling with these engines you should have a set of precision measuring tools of some sort. | | | | | Joined: Apr 2012 Posts: 135 Shop Shark | | Shop Shark Joined: Apr 2012 Posts: 135 | I don't need anyone to measure pistons for me. The guy popped the head off a 261 he bought, curious as to what the cylinder walls looked like. He does not have the tools, equipment, or knowledge to rebuild an engine. When he saw the 90 on top of the pistons, he assumed it was .090 over. He emailed me photos because I told him .090 over seemed like a rather oddball oversize. I posted the pics to see if there was anyone familiar with the markings on top of the pistons, thats all.
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | | | |
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