So I haven't pulled my apart yet however I'm just trying to pre plan...motor is a stock 525 sc and I'm building it with new rods pistons bearings dart heads etc....my question is if I find the cylinder walls to be in fine shape is there any added value to boring it out anyway to say a 468 or is not going to gain me anything?? Don't want to waste the money for little gain if I don't need to

Thanks

Stewart

I should mention I guess...rods are stock length and pistons I plan to bump comp to around the 8.5:1 ratio from the stock 7.5:1

motor will also be fitted with the B&M version 256 super charger not the stock 177 also and it will have a chiller

is it going to gain you in power? not that you will notice, is it going to gain you in engine efficiency? most likely yes. unless the engine has only a few hours on it the bores will not be perfect. you will gain by boring and truing the cylinder walls for a good ring seal, etc.

I doubt I'll be able to get away with not boring honestly...its a 97 with 430ish hours so I'm sure its getting wore out for sure

Even if they look perfect they will be too big. You will have to bore and hone to the next size pistons for proper clearances

It’s also a great time to deck the block for a better seal and then you have a fresh surface to use the MLS gaskets. It’s not just the boring that happens but a good cleaning and prepping of the block will give you a longer living engine.

that's a good point...so based on that should I just go enough to clean the holes or go to a 468 or??

I'd just bore the minimum to get a round cylinder. .030 over is the norm. You could even go .010 or .020 over, and custom pistons. I wouldnt go .060 unless mandatory. Those blocks arent like a dart block, and once you start boring them, the walls get thin. Then you're back to bore distortion, ring seal, etc. If it was a max effort N/A race engine, then bore away. Marine pleasure engine with forced induction, nah. Just my opinion

you'll gain more out of bore notching the block,but you need the new pistons to see where the top ring ends up at the top of the bore.I'd also go minimum boring.