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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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#25356 03/11/2004 2:31 AM | Joined: Jul 2003 Posts: 141 Member | | Member Joined: Jul 2003 Posts: 141 | Well, the machine shop just notified me that my tired 235 is already bored .060 over and the crank has been turned .010. What is the recommended maximum bore for a 235 ... is .080 ok for a daily driver?
..... or should I just start searching for another 235 or a 261. The 848 head on my 235 is in very good shape, per the machine shop.
I have all the external parts for the 235, including flywheel, bellhousing, starter, etc.
Can those be used on a 261 if I find one? | | |
#25357 03/11/2004 6:59 AM | Joined: Mar 2001 Posts: 327 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Mar 2001 Posts: 327 | If you aren't working the truck in hot temps or real hard all the time, boring a 235 to .080 over is a good way to go. I wouldn't do it to a hard working truck though. You'll end up with cooling problems. Lots of metal in 235's and I have seen them 120 over, but I sure wouldn't go that far. If you take good care of your engine you will have no problems. The crank can go to at least .020 over.
About your second question- YES!!!
Oly in Oregon Rest in Peace1945 GMC COE Victory Truck 1953 Willys CJ3B 1955 Chevy 1st series 3/4-ton 1958 WIFE Last series Never say "Whoa" in a mud hole
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#25358 03/11/2004 3:25 PM | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | Well, back in the day when these engines were newer, the hotrodders would take them .080 to .125" over. But since these engines are so old now, rust and corrosion have eaten at the water jacket side of the cylinder wall. Its best to have any block sonic checked for wall thickness when boring above .060". Cheap insurance before you go ordering special pistons, rings, balancing, boring, etc, just to find out you've struck water or warped a cylinder.
chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
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