Straight 8 need overbore or just hone?

[Jyrki]

I just opened up my 46 Roadie engine, and measured the cylinders. It appears that it is in STD size (only 90 kmiles). The cylinders look fine, but showed 0.003" to 0.004" of wear at the top of cylinder when compared to middle of cylinder. Also, the cylinders were out of round some 0.0012", and strangely, they were larger in the crankshaft direction, so either the rods are bent or the block has relieved some tension!<BR>Anyway, I'm asking you guys if you would recommend an overbore, or just honing and new rings? Also, do you know if the STD size rings are file-fit, or should I get oversize rings to begin with? Also, what would be the recommended source for the rings, that is, any good or bad experiences<BR>Thanks,<BR>Jyrki [img]images/icons/confused.gif" border="0[/img]

[Bill Stoneberg]

Hi,<BR>I am a firm believer in doing something once and not having to worry about it. Therefore I would bore the engine. I also replaced every part except the crank and the block and head. Those old engines have lots of metal in them and you can go oversize quite a bit.<BR>I went 30 over in my 50 and got everything needed for Buick Specialists in Washington State. Talk to Jim at RivieraJim248@gateway.net . He is a big help. The parts cost me about 2K American Dollars.<BR>Good luck <BR>Bill<p>[ 05-19-2001: Message edited by: Bill Stoneberg ]