The 6g7 is not a 4g6, they make power very differently and different blocks take the machining differently. The 6g7 series motors are very sensitive to geometry and use a different alloy in the sleeves, they're put together with great factory quality and that it why they last for a long time but when you start messing with it they go south in a hurry. I myself have pulled apart a pair of 6g7's that were built with hand honed cylinders and drop in forged pistons that both ending up going up in smoke. You're dealing with 2 cylinder planes here, any amount you are off is going to cost you exponentially more.
Now, if the OP had the correct bore micrometer in hand I would have hesitated to say anything. I personlly don't believe in hand honing anything other then a daily motor you're reringing but with the right mindset and knowledge I also believe that to each his own. However, when going after large amounts of performance and spending lots of money to do it going about it properly is worth a whole lot more then the difference in price. The vibe I get here is an engine that goes from stock to built without leaving the garage and that just doesn't lead to success. The ARP mains don't typically tweak the girdle (though it's always a must to check) but the rods ALWAYS need resizing and while the pins may look like they fit the rods well they may need rebushing anyway.
I'm not calling anyone stupid but I've spent a lot of time and money in these motors and would like to see success for anyone else who chooses to do the same because contrary to popular believe there is a lot of payoff to be had.
