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Old 09-03-2006, 06:38 AM
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350-.060 Over???

I tore apart my "rebuilt" 350 yesterday which had been bored .040 over about 25000 miles ago. I found slight gouges and scratches in one cylinder.

Looks like I have to go .060 over.I'd like to 383 stroke the motor.Its I believe an 86 with a 1 pce. rear seal.

Will there be any issues on overheating,strength.....Its a 4 bolt main.

Thanks

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Old 09-03-2006, 08:30 AM
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I'm the type of person who believes that you shouldn'd bore anything larger than it really needs, you may need to rebuild it again. If the scrathes are minimal and only in one cylinder they could probably be honed out and you could save the cost of a rebore. Was it burning oil before you tore it down? Why did you tear it apart if it was recently rebuilt? I did a really tight budget rebuild on my 350 and it still has some gouges and scracthes in most all the cylinders and it doesn't burn a drop of oil. It's not a high performance monster either but it get's the job done for my daily driver P/U. As for the .060 over bore I think the newer one piece blocks are only recommded for .040 over. (someone on hear can tell you for sure)
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Old 09-03-2006, 08:42 AM
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It was rebuilt by a company with a bad reputation ,so I thought I'd check it out. I have the engine on a stand and no other project available ,so I thought I'd start my next project with the motor.

It was blowing oil out of the breather on the valve cover before I pulled it from my previous truck.Don't know what caused that so why not investigate while its on a stand. I was just going to check the bores,hone it and install new rings and bearings while it was apart. Also found the crank was not ground during the "rebuild".
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Old 09-03-2006, 05:22 PM
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This is a pretty obvious suggestion but before you do anything find yourself a machine shop with a GOOD reputation and have them look at the block. Hopefully the bad guys didnt screw it up to the point that you have to go .060 over. If it can just be kissed with a hone maybe you can save it. Blow-by is usually a sign of the rings not seating in a new engine. I would also show them the pistons with the rings left on to see just how REBUILT it really was. Good luck.....Dave
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Old 09-03-2006, 07:10 PM
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Thanks. I'll bring it by someone who knows what they are doing later this week.


Pugsy
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