You are probably right. Do you know if the 350 flywheel will work on the V6 and what rings should I order if the cylinder measures 3.85? The number on the block is 25506397.
Buick 350
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it will not work. the buick 350 is externally balanced (i think the v6 is to), so the flexplate (flextplate is what you have, flywheel is for a manual transmission) will be nowhere near close in balance same with the harmonic damper. it's got the same tooth count and starter mount location as the v6 though, so they share starters.
Also, the factory bore for both engines is 3.800 inches on the dot, if it reads 3.85", either someone bored it .050 for some reason in the past, or you're confusing the bore size of the 350 with it's stroke, which is 3.85". Use a cheap digital caliper from harbor freight or something (around $20) and post pics of measurements. that'll be close enough to tell bore size.
Yes, my bad. I meant flex plate. There were only two bolts holding it to the torque converter. As you can see in the pics they are wallored out. The bore size measured 3.85 before and after I hit it with the 3 stone hone. The timing chain is all steel and it has stainless steel freeze plugs.
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How do I tell what rod bearings to get. Should I get a couple of different sizes and check them with the plasti gauge? I’m also having a hard time finding rings for it. I contacted Hastings but I haven’t heard back yet.
Sorry; jumping in late here. Any idea what size the old rod bearings were? If they're oversized, check for stampings on the backsides. Just make sure your crank is ready to go before you buy rod bearings. I had my crank polished before I bought bearings. My crank had already been ground .010" under stock diameter but cleaned up fine so I only needed to buy .010" rod bearings. Same with the main bearings. As for the bores, .050" over is an odd size. I've only seen .030", .040", and .060" over.
If the bore really is 3.85" (make sure the calipers are zero'd out when closed and not dirty), then it'll probably have to go another .010 to make it .060 over so you can find pistons. idk why someone would bore it .050 over, no one makes .050 over buick pistons.
Measure the pistons around the skirts, see what diameter they are.
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