building a 4.8
Thread Starter
Teching In
Joined: Mar 2011
Posts: 2
Likes: 0
From: Coldwater Ontario
building a 4.8 so straight up I'm a newb. I've never really got into engine work but I recently picked up a gm 4.8 for $300 with everything minus a trans with the sole purpose of learning engine work. while doing some looking around and research I'm getting confused with all the overload of information out there and what needs to be done/what should be done/and what I would llike to do. I came accross a vid http://www.powernationtv.com/episode...ls-tech-part-1 that kind of follows the same lines of a build I want to do. My thing is I'm buget minded but i don't like doing things twice so I want it to be reliable. in the vid they pretty much don't replace anything except for using an upgraded valve spring kit http://www.summitracing.com/int/parts/sme-k-14300 . what some of my questions are is if you're going to open the engine right up why not replace the rings, maybe rod bearings, push rods ect. my goals are 300whp and to live at high rpms. how much would it add to my budget replacing those things and even going as far as centre boring the block and honing out the cylinders or for my hp goals is that really nesecary? I want to keep the truck intake cause I hear they flow pretty good and hood clearnece isn't an issue. they also just reserficed the valves but consitering how much a valve set is why not just get new lighter one? sorry if I'm all over the place just everything is a little over whelming
Teching In
Joined: Jan 2014
Posts: 30
Likes: 1
To give you a base idea on what a "stock" rebuild of the bottom end costs. I did my 5.3 myself. Bore, hone, and tanked cost me $350. Rings were $110, about $50 for replacement bearings. I did replace my dished pistons for flattops but your 4.8 comes with them. Between the parts and replacing things like gaskets, oil plugs, oil pump, and timing set the bottom end cost me about $1000 w/o the cam.
If the motor is in good shape you can hone it at home and rering and do the whole job for under $400 and have the piece of mind of a truly fresh bottom end.
All you need to hit 300rwhp is to throw a dart at any half decent cam shaft and just let the motor breath...
If the motor is in good shape you can hone it at home and rering and do the whole job for under $400 and have the piece of mind of a truly fresh bottom end.
All you need to hit 300rwhp is to throw a dart at any half decent cam shaft and just let the motor breath...
