v8Polish

I was looking into doing a rebuild kit on my 305

I just came across this kit
http://www.summitracing.com/parts/FE...-311/?rtype=10

i notices its 3.766, and correct me if im wrong, but stock 305 bore is 3.736, so will this work?

If you have any suggestions as to what kit to choose or what company to trust, please let me know.

Also, I will look more into it, but while I am here I may as well ask.
I am looking at getting another 89 rs with a 350 in it, i was curious if i could swap the 350 from this 89 rs to my 89 rs that has a 305, if this would be plug and play essentially. would a posi be a must? What do I ABSOLUTELY NEED to do. I am new at this, any information helps.


Thanks

Project 3.4 Camaro

No the rebuild kit won't work, those pistons are overbore, if you are rebuilding your bottom end the proper way to do it is to bore the cylinders .010(ie. to 3.746), you can go more if you want, but personally I would rather have thicker cylinder walls than a nominal power increase, yes the engine will swap, complexity of the swap depends on what they both are, ie. if they are both tpis, both carbs, or one each. And no, posi is not a must.

Sonix

iTrader: (1)

That rebuild kit seems like it would work, if you were to bore your 305 out .030". You generally don't have a choice if you can bore it out .010", it depends on the wear of the cylinder walls. .030" is the most common amount, I haven't heard of anyone getting away with boring out their cylinders .010". If I were you, i'd grab a 350 block that needs a rebuild (generally ~$200 or so), and buy the 350 rebuild kit from summit. Rebuild that, and drop it in. That's probably cheaper than buying another car for its engine, and gives you less downtime because your existing engine stays in your DRIVEABLE car for longer. Do a search on rebuilding a 305 on this forum, and pay special attention to posts made by sofakingdom.

If you buy another 89RS with a 350, why not just continue with that car? If the car is junk, but the engine is ok, then yes, you can swap it in pretty easily. There will be a few things to consider, but no show stoppers.

v8Polish

Thanks for the info. I thought about just keeping the 89 with the 350, but the paint is not so hot, and mine was just redone. Also mine is a 5sp, and the 350 is auto, i prefer the manual

Project 3.4 Camaro

Unless the v8s are different, I don't see the need for taking it out .030 to drop new pistons in...

v8Polish

How big of a piston should be installed without boring my 305. ?

Project 3.4 Camaro

Um, stock, but I advise against that, even if you do that you still have to hone the cylinders, so imo you may as well have it bored. Cylinders wear down over time, meaning that eventually the tolerance between the cylinder wall and the piston rings gets larger, in order to bring it back in, the block must be rebored, and oversized pistons put in to have a tight fit again.

v8Polish

Thanks for helping make sense of it to me.

Project 3.4 Camaro

Glad I could clear it up for you, size of bore determines needed size of piston, ie. if stock bore is 3.755(arbitrary number) and you didn't bore the block, you would need 3.755 pistons, if you bored the block .010, you would then need 3.765 pistons, the same applies to the piston rings, I suppose on a low enough mileage engine, or in a situation where maybe a piston broke and you were just replacing one, you might get away with stock size, but on anything close or over 100k miles I would rebore.

InfernalVortex

iTrader: (4)

In case it wasnt clear, you always overbore the smallest amount possible. A machinist with a bore gauge will measure how out of round the bore is, and determine the minimum amount necessary to get the whole bore, on every hole, back to factory roundness tolerances.

If they tell you it only needs .010 then go for it, but .030 is by far the most common. Never go more than .040. .060 over pistons are available, but I would recommend against it.

Also this kind of work is expensive and laborious - this is when you consider doing a 350 swap, but that will increase your costs heavily once you get into making it work in your car.

torque_is_good

are you catching the drift of what has been said to you? You are not going to buy a rebuild kit and just toss the parts into the engine. Can you say

machine shop

there is work to do before slapping in new parts

v8Polish

Yes, thanks to everyone dumbing it down quite a bit for me. I am understanding

I might heed prior advice and look for a350 that needs a rebuild or keep my fingers crossed for a good 350 to land in my lap.

Thanks to everyone who partook here!