Re: ZZ4 short block vs. Std 350 4bolt -?
The ZZ4 shortblock is a nice package, but I wish they'd use forged pistons. Some will also argue that the lighter weight casting is more prone to cracking, and limited as far as overboring is concerned.
The factory roller cam system is definitely slick, and if you plan on using a roller cam, you will gain some of that $1000 back, as retro roller setups are definitely spendy.
The one piece rear main seal is also a plus in my opinion. The drawback is that if the seal ever does fail, the transmission has to come out in order to replace it.
The warranty part is nice, but I've heard that GM isn't the easiest to deal with on those issues. Also, I believe the warranty period begins on the date of purchase, and if you don't plan on immediate install, the warranty could actually be expired before you crank the motor. Check on that though, as I'm not positive.
The other GM shortblock you linked to has -18cc dished pistons? I'd steer clear of that. You'd be hard pressed to make any compression even with a small chamber head. Perhaps it's a typo.
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