Now considering what to do, if anything, my Challenger engine. It's a low mileage 76 440 with factory measurements and rods, pistons etc. so untouched. It runs fine, I won't do many miles (700/year) and won't overstress it with high revs, burnouts etc. I'll be keeping the car for a long time. I've had the oil pan off and the bearings and bores look in excellent condition. Calcs show about 7.7:1 CR with stock 1.912 compression height pistons. I don't NEED any more power but........I'm only human!. I've found some stock bore pistons that will give me around 10:1 CR with 2.067 compression height (almost flush) so a lot more power - back to real muscle car days. Heads are 452's so hardened seats and 88cc capacity. I would check the bores from the top before making a decision. So - is it realistic to only change the pistons or should I leave well alone? Advice welcome.