Jake Prater

So here's the skinny, I have an 05 rcsb 4x4 Silverado. It has a 4.8 in it now 3.42 gears 4l60e. I got my hands on a 5.3 l59 as a candidate for my build. The plan is this.
Reuse crank and rods
New flat top pistons
243 heads
Tsp220r
Ls7 lifters
High volume oil pump
Ls2 timing chain
Reuse rockers with comp trunions
ARP head studs, rod bolts
Tsp hardened push rods
Double valve springs with titanium retainers
Lt headers
Tsp ory
Tsp by yank 3000 stall with lock up
Transgo hd2 shift kit
Vette servo

Questions I have are what cr would I be looking at with heads and flat tops? Should I port and polish the heads possibly mill them down? Oversize valves? Floating or pressed wrist pins. What are pros and con's of each? What head gaskets should I run? I've heard of people using ls6 for there lower crushed thickness. Any other upgrades I should consider? Tuning will be done by Justune Here in kc. For those of you who don't know who that is he is the owner of "reddragon" I would love to hit 400rwhp but I think that's a little out of reach n/a and no spray. Thanks everyone!!

batboy

iTrader: (6)

With uncut 243 heads and flattop piston with -1cc valve reliefs and a overbore of .010" would be around 10:1 CR. Milling the heads .020" would give you almost 10.5 (with GM MLS head gaskets which I recommend). If you used a 6cc dome pistons and uncut heads that would net you around 11:1 CR. Sorry to break it to you, but you won't even be close to 400 hp.

Jake Prater

The flat tops i was looking at didn't have valve releifs iirc. I'm considering porting and polishing the heads. I have heard milling the heads .030 would bring the chamber size down to 63cc (I think, factory 862 size) correct me if I'm wrong. That would bring me up to roughly 10.7:1 right? What intake would u recommend I run? Nothing is set in stone yet and my goal is 375-400 HP/tq. I have the engine but parts have not yet been purchased. What would y'all reccomend I do for n/a 400?

batboy

iTrader: (6)

You need more displacement and a bigger cam and ported heads for your hp goal. You are talking hp to the wheel, right?

243 heads have 64cc chambers. 862 have 61cc chambers. Milling .030 subtracts about 5cc. 243 heads milled to 59cc would give you about 10.7 CR with flattop pistons. How much are you boring the cylinders out and what pistons. Bore size affects compression to some degree.

Jake Prater

Sounds to me like I need to re evaluate my build a bit. I went with the tsp220r cuz its a low mid range cam. I've thought about boring or stroking but haven't got that far in my research yet. I'm not opposed to it by any means.