I'm wondering how much it usually costs to bore out a 305 to a 355, (or whatever it bores out to). Just wondering if it would be cheaper to get an RS 305 and bore it out instead of tryin to find a 350.

 

Welcome to my world! I just had my 305 bored out and by the time I got it back from the machine shop I had tallied up a good chunk of change to do it right. Check out my post on 305 build up on the boards. You will probably find it is cheaper to go with the 350, like the guys with a lot more knowledge than I have told me, but it's all in what you are trying to accomplish. Either way, as long as your havin' fun! I can keep you updated on my project, if you decide to press on with the 305.

 

You cant. I think it basically comes to about a 310 or so with standard stroke. YOu dont bore an engine for power gains, its for cylinder wall maintenance.

If you want performance, get a 350 and rebuild it. It will cost the same if not less.

 

much cheaper to find a 350 and go that route. call local machine shops, i'm sure they have them sitting on the shelf waiting to be machined already.

 

i just bought a 400 cid motor for $550 so im sure u can find a 350 for cheep

 

sweet...thanks guys. I'm gonna call about an iroc tomorrow, Ill go the 350 route and just wait to find one in good shape, hopefully this iroc is up to par! Ive been searching forever for a good third gen. They're a rare breed! haha

 

since you're local to me, I would definately call up local machine shops and ask if they have motors laying around, typically they always do for a good price. I've gotten free block, rods, and crank because they were charging for all the machine work.

 

305 engines have a bad rod to stroke ratio. in laymens terms- bad for making power. If you invested an equal amount of $$ into the 305 and repeated the same efforts to the 350, the 350 would respond much better to whatever you do. you'll have more power for the money and time you invest.

This is why most folks overlook the 305 and go to the 350. some engines are just better at making power. they have a better/ more efficient design. This is one of them.

 

That's odd,I just learned something.I always thought that 305s and 350s had the same rod/stroke ratio,but it turns out 305s have a "bad one"

 

Really doesnt have anything to do with a rod/stroke ratio. Its more a matter of bore size. Contrary to common belief, size does matter. The bigger bore has many advantages. Not only that, there is no replacement for displacement. Simply put, the bigger engine always makes more power, all things equal.

 

how bout puttin a 350 crank in a 400 and some longer rods oh yea lol 381 right? big bore short stroke thats what im talkin bout

but i guess thats alittle off topic

 

I'll take my 400.

 

cubes are still going to win.

Look in to rod and stroke ratios more if you're interested. Car craft and other magazines have done similar buildups to different rod and stroke motors and still end up with the same overall consensus, being that the rod to stroke ratio has little do to with the performence variance of your motor unless you planned on building something outragous that makes no sense...

rod to stroke ratio is a misconceived notion for the most part. Every forum i've ever been to always has arguments about it. Overall i think your rod to stroke ratio has much less to do with your buildup than the overhaul parts matchup....

just buy a 350 and check out northernautoparts.com

They sell 350 rebuild kits for next to nothing. Call up the machin shop as said above and see if they have any good 350 blocks already bored and align honed cleaned and that sorta deal. You may find that you can build you a 300hp 350 for next to nothing.