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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: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | So I decided to rebuilt a 235 for mmy 42 suburban and have a few to choose from.one of the has the stamping 04 on all the Pistons is this a virgin block that has not been honed yet? Or did they stamp 40 over backwards as usual all info is very welcomed. | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | I'd clean up the top of the pistons for a better look at the markings. You can also measure the bore and that will tell you if the block has been bored. | | | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | I did and every single one has 04 | | | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | What was the stock bore size does anyone know off hand? | | | | | Joined: Jul 2013 Posts: 200 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 200 | 3.562" is the stock bore size for a 235.
We cannot solve our problems today using the same thinking we used when we created them!
Albert Einstein
| | | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | Ok.ill me sure when I get back. So does anyone know what 04 is? | | | | | Joined: Jul 2013 Posts: 200 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 200 | It could mean .040" oversize. If so the bore would be approx. 3.600" in size.
We cannot solve our problems today using the same thinking we used when we created them!
Albert Einstein
| | | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | Ok so what rings would I get standard? , | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
Not if the bore is 0.040 over.
You, or someone, will have-to (want-to) measure the bore on every cylinder.
| | | | | Joined: Feb 2004 Posts: 29,761 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,761 | A $20.00 set of dial calipers will be accurate enough to get a ballpark guesstimate of bore size. A set of telescoping gauges and/or an inside micrometer will be more accurate. Be sure to measure about 1/4" or more below the top of the block to avoid getting an incorrect measurement due to carbon buildup above the piston ring travel, or remove the carbon with a wire wheel in a drill motor before measuring. Also check the taper of the cylinder. If it's tapered much over .005" top to bottom, the block will need to be rebored.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | Ok i will get back within a few days on the results. I'm stump on the marks. | | |
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