Confused??

5one9

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The math works out. He has the heads too with nothing special done to them. My guess is 507. Also check out how deep the ring mark is down in the bore. Reminds me of the weird KB pistons with the second ring about an inch down. Perfectly flat pistons too....................like KB..............
 

48Austin

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No. Everything I've read about and seen on the CadCo site says that this should be a stroker.
 

Caddylackn

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https://www.ebay.com/itm/GM-1495200...Block-Bored-To-4-500-Should-Stay/362984932805. 547? Standard crank? Stock type chain? Appears to be stock rods? How did they get 547? Block bored .200?o_O $1200? Me want it!
It looks like this may have BBC overbore pistons. It sure would be nice to know the deck height. It does not show a picture with the piston at TDC on any cylinder.

I think I read somewhere that you shouldn't go more than 0.120 overbore without sonic checking and a partial block fill.

Its got blue Felpro head gasket material on it, there is no way a Felpro head gasket fire ring would have held compression with a 0.200 overbore. This would be a custom head gasket only deal.
 

5one9

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He responded to my question with the following

“ i have been building engines and a machinist by trade for 50 yr, its 4.500 bore. i checked it 3) times for another guy!”
 

48Austin

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I have talked to CadCo on the phone. And they said I could safely go .120 over on a street engine. But .200 over? Don't think so. Also 543 inches comes up to a CadCo stroker kit. And this don't look like a stroker. Cadman put the numbers up when he was still on.
 

5one9

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I'd say she's junk. He has several things like that on ebay. All used up.........................
 

48Austin

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Seems his prices are all over the spectrum. Makes me think "RIPOFF"!! Cad bare block 999, but short block 1299?? Mag hemi unfinished valve covers 349?? Covers alone are probably worth a couple of G's as garage art.
 

Caddylackn

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Well apparently whatever combo of piston and 0.200 overbored block it has didn't work or the dang thing would not be all apart now.

If, and if it had custom pistons that would work with a 0.200 overbore, a 4.304" stroke with a reasonable deck height, this could maybe be worth something as a high torque race motor, like tractor pulls, mud bogs, air boat? or something. The bores already look well used, and don't plan on another overbore to clean up any damage :rofl:. At this point all you could do was to sleeve it.

I guess we are not ever going to know.......

I am thinking there was a bored machinist somewhere that had some 502 BBC stroker pistons that they wanted to use up so they tried this experiment and it failed. A 4.5" bore head gasket would definitely be an expensive custom item. You can look at the removed gasket material left on the block and see, there could not have been a fire ring sitting on the block, it was paper gasket material all the way to the edge of the bore.

Anybody that knew what they were doing would never put a stock type timing chain back on.
 
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