So I'm currently in the process of beginning my 350 build on a very tight budget. I have decided to not use the junk 20 over pistons I cant find any info about since the bores are in spec all only need to be honed. I found a set of Hypereutectic dome pistons i want to go with. My crank and rods were already balanced with the other piston. From my understanding balancing is never exact and seems to just be within a certain range. So will i need to rebalance with the new pistons?

 

Yes, it would need to be balanced.
Also, do you understand the drawbacks of dome pistons?
Given your topic question, I'd guess no. Safe to say using them would be a disaster for you.

 

"Need"? Define.

Sounds like you're taking enough shortcuts and making enough other mistakes, that one more won't matter.

Everybody likes to get on here and beat everybody else on here over the head about "tight budget". I get SO SICK of it. So I'll let you in on a little secret that some of us have known for years:

THE PARTS AREN'T LISTENING TO A BUNCH OF POOR-MOUTH.

The oil won't take pity on you and stay on the right side of the rings; combustion won't be merciful and stay on ITS side of the rings; gasoline won't cut you any slack and not detonate if you put together a motor with too much compression, a less-than-optimal combustion chamber shape, and poor "quench" distance; pistons designed for an almost interference fit, rather than clearance, won't decide to be nice to you just because you're cheeeeeep, and magically expand to fill too-large bores; and so on.

Looks to me from what little you've said about this project, like balancing (or lack of it) isn't going to affect the outcome very much one way or the other.

If you want a motor you can be proud of, that runs better than other people's that built theirs out of the same bill of materials, that lasts a long time, that causes no trouble while giving good service, then DO IT RIGHT. Otherwise, if you just slap a bunch of whatever together without any attention to detail, you'll just end up with whatever you end up with, and posting on the Internet about it and then ignoring the advice you get won't make any difference anyway.

 

Well....yeah.....looking at it that way....I guess my answer would just lead him to flushing MORE money down the toilet

I'll modify my response.
This engine: NO
Any engine worth building: YES

 

A simple yes would have been fine. You know nothing about my build. Since still shopping around and collecting parts you can't possibly know what is going on. Sorry that me being in a budget is a problem for you but I'm not going to stupidly spend my money when I cannot afford to. From my research online I found the everyone said if the weight is the new piston was less or not over by much then there was no need to waste money re-balancing but I wanted an opinion for my set up I will if I needed to, which was made very clear that I do, and I will but I'm just trying not to waste money in the wrong places or not do something and have problems

 

You sound confident in your ability. I'm surprised you wanted an opinion from anyone on here.

 

Don't take it personal, the members that have been on here for a long time see this scenario of "budget build what can I short cut" play out over and over again.. I would suggest doing research on rotating assembly balancing and find out exactly what you need to do to verify whether you can get away with re-balancing or not.

As far as using dome tops in a pump gas motor, its typically not done unless you have huge chambered heads. what are the goals for this engine? is it a street car or track car?