383 Stroker

[KingNeptune]

So, I've been tossing around the idea of building a 383 Stroker for the Jimmy. It has a spun rod or main bearing. So, I need a new crank and bearings anyway. I know that it's basically just swapping in a 400 crank for the 350 crank. But is that really all there is to it? I would think I would need to also replace rods and/or pistons. I know there are people on here that have built them. Any advice?
Thanks.

[lilkiduno]

there is a lot more than just throwing in a new crank. depending on the route you want to take, the old school way, 400 crank turned down to 350 journals, boring 0.030 over bore, new rods, new pistons I am sure there is more but I am at work with limited access to my notes. Or there is the GM version, stock 4.000 bores and a GM 383 crankshaft which fits in your 350 journals that you spun a bearing in. you can get it line honed and oversize your bearings.

[KingNeptune]

Thanks Lilkiduno. I didn't think it would be as easy as that. Just didn't quite add up in my mind. But I saw somewhere that somebody said that the 383 was just swapping the 400 crank in place of the 350 crank. And didn't seem like it would be that simple. If I go with the GM 383 stroker crank, or one of the other brands I see online, can I use my current rods and pistons?

[jaredts]

You have to clearance the block and use a modified 400 crank.  With the longer stroke and existing pistons and rods it won't work.  The pistons will hit the heads and stick out of the block.  Do some homework on the kits available.  I believe this would be the way to go for you.

[KingNeptune]

Thanks Jaredts. That's exactly what I thought would happen. I'm starting my research on this.

[78BIG-TEN]

There is all kinds of options here.Balance internal or external,5.7 rods will work but some clearancing needs to be done.Check around on internet as there is tons of info on this