Chaos07

Found these on ebay are the castings right?? sorry Mods if this isnt legal on forum but here is the link Help a NEWBIE out.

JohnS Z28

iTrader: (1)

yep those are them, that guy always has sets of 243s and 799's on ebay, cheapest ive seen em go is $350.

Chaos07

ok thanks, is there anything i should do to them if i get them

Bramlok

iTrader: (7)

Depends how much money you want to spend. You can send them to get ported which can cost upwards of around $1000. Or a cheaper alternative, you can just get them cleaned up, get a nice valve job and have them milled some. You don't know the true mileage on them so a new set of valve springs would be good also.

At a bare minimum, I would at least replace the valve springs before putting them on.

Chaos07

What kind of valve springs would i use, there are different springs out there and what about rockers and i know to use Ls7 lifters also. I was thinking of useing a 224R or 228R cam these heads should be a good match for them right?

baxsom

iTrader: (6)

with either one of those cams you should get at least a .600 lift spring like the comp 918s or the PAC 1218s. Stock rockers are great especially when combined with the comp upgrades.
i am going with the 228R and 243 heads on my 00C5.

Chaos07

well i dont know if these heads come with rockers, what would be a good stock replacement

redbadss

iTrader: (4)

looks like he also has another set up for $360 as well, sounds like a good deal and he has a 100% rating so he seems legit

Chaos07

What I will probably do is get the springs and rockers and put them on along with a cam

00silverGTP

iTrader: (3)

not to high jack your thread but I was also debating this. I already have a ms3 with dual springs, I can just swap everything over including the rockers correct?

baxsom

iTrader: (6)

stock rockers (ls1/ls6 are the same) with the comp cam trunion upgrade. stock rockers can be found for 25 bucks and the comp upgrade is 130.

Deviant LS1

iTrader: (4)

I bought a set of 243's from that seller. It took a couple days to get the heads shipped off to TEA. TEA went through them before they started the work and the heads checked out fine.

Jimbo1367

I recently got low milage 243s (w/valve covers/rockers/stands for $335 IIRC shipped. I am hoping its a good deal). I want to send them to TEA.... What engine & cam do you have? And numbers yet?

br408408

iTrader: (1)

I bought a set from him 2 months ago for $350.00. I am going to send them to AI or TEA, but haven't done anything with them yet. They arrived clean, well packaged, and seem to be in good shape.

Deviant LS1

iTrader: (4)

Here's the info on my setup.

https://ls1tech.com/forums/dynamomet...0hp-427tq.html

ggino85

iTrader: (1)

i purchased a set of 243's from the same seller about two months ago, machine shop checked the heads and everything was great. looks like he sells quit a few around here

garygnu

do a valve seat leak test,if they need a valve job get new springs and seals.find some low mileage stock rockers ,or get some upgraded stock rockers from TSP.

remauto1187

iTrader: (1)

There is another guy on there out of Missouri that sells "new" 799/243 heads. He is just south of Springfield, MO. He gets new engines from GM that have been kicked out of production for defects such as stripped threads on block plugs, etc. He disassembles the engines and sells the blocks, heads, etc. I got my set of heads for $400 shipped IIRC. They were brand new but the block they were on failed head gasket sealing test. Heads had some minor scrapes on the sealing surface. I will have to have them shaved but they are literally brand new heads. The valves still have the paint marks on them! He sometimes has the "make an offer' enabled. Easy guy to get along with and his desription on my heads were upfront and better than described.

Jimbo1367

I've bought from him too. Very nice parts and great customer service!

Arctic_Z

I'm wanting to start my first build here real soon, plan is to use 243s. I'm interested in the heads that this guy from ebay you all were talking about is selling, I don't want to come off as stupid ( just paranoid), but this guy says in the item info..

2 - USED CHEVY GM GEN III 5.3 5.7 6.0 CYLINDER HEADS CASTING NO. 12564243,

"THESE HEADS WERE REMOVED FROM A 5.3 ENGINE, THESE ARE THE SAME HEAD CASTINGS USED ON THE LS2 AND LS6 EXCEPT THEY DO NOT HAVE THE SAME VALVES (valves are the same size) OR SPRINGS,"

The part about.. "They do not have the same valves (valves are the same size) or springs"

I'll be getting new springs for cam but can I use the valves on the heads already?