hi was just wondering, if i put a turbo kit in a 420 motor do i have to change out the pistons or can i run stock??

You can run low boost like 8 psi on stock internals but for anything higher you would want to build the bottom end up with forged internals. If you use the search function on here you can find a ton of posts on just that subject. Also using the search will keep the board from getting cluttered with multiple posts over the same subject. Not trying to say no one will help but I have found most my questions have been answered just doing the research on it before I ask. Also will keep people from coming on and telling you to search more . The site is full of information on here and the wikki has lots of useful articles on just this subject. Hope you find the answers your looking for.

thanks for the info, i just recently join the site. not use to it yet thanks for the advice

No problem I started doing the same thing when I joined and I got lots of folks telling me to just search. The site is great and you will find a lot of information on here. Good luck with your project and happy modding.

Originally posted by armyguy1027
You can run low boost like 8 psi on stock internals but for anything higher you would want to build the bottom end up with forged internals.

That is not really the most accurate way to estimate what you can do.

8 psi on a T25 is not the same as 8 psi on a GT3076. To the original poster, the answer is low boost on a small turbo is a safe bet, however boosting a non turbo motor will inevitable result in destruction - the old saying of "not a matter of if, but when" it will blow applies here.

So do it right, build the motor with appropriate internals, then boost. Unless your goal is to see how far you can push a stock motor before it blows, in that case go ahead.

Originally posted by CODE4
however boosting a non turbo motor will inevitable result in destruction

This is also not entirely true. The subject isn't one that lends itself well to absolutes.

Most of the time, the stock motor will let go due to human intervention or mistakes. Insufficient fuel system and/or too much boost are the top causes if I had to guess.

Code Is right boost pressures will have drastic differences depending on what turbo your running. but from what I found in my build I decided to not even bother trying to build ANY boost on a stock rod. Just build it right and do it one time.