armintheman

iTrader: (31)

need some oppinions on which is the best performing out of those. im going to stay NA with a 100 shot of nitrous. dont know which would give me the most power gain. the 863 have a valve job done and runners are ported, 241 have ported runners stock valves, 243 are all stock but new

armintheman

iTrader: (31)

bump...

ss.slp.ls1

iTrader: (36)

I would buy the 243's and have them ported.

Omega Doom

iTrader: (2)

another vote for the 243's but the 241's aint that bad!

1CAMWNDR

iTrader: (21)

It will not matter once they are ported.

Bad Blue WS6

iTrader: (41)

((putting on giant flame suit now))

i have seen many folks on this board that have ported 241's that out flowed 243's ...not sure about if the 243's are ported or not, BUT if your on a budget,,,,,,,its food for thought

Also mentioned in the LS1/LS6 performance book by Chris Endres, a good read

it all comes down to the port work, and who's doing it.

((ducking now))

ss.slp.ls1

iTrader: (36)

Yeah, that would be my main concern.

96lt1m6

iTrader: (31)

sure does...
take a closer look at the ports stock,the gain of the 243 head is not a bunch but still much better than the 241.stock or ported.

armintheman

iTrader: (31)

well guys i purchased the 863s. i didnt get meny responces and those heads felt like a good deal. they were the cheapest ones and i heard alot about 5.3s. these are ported 5.3 and have a 3 stage valve job on them. fully assymbled and i purchased for 350. the guy said on his ls1 he gained 25rwhp over stock 241s. so im swaping the ls6 valve springs off it them, and putting my titanium retainers, new comp springs, and new valve seals and call it a day. hope i get some power out of them!! what do you guys think??

ss.slp.ls1

iTrader: (36)

Sounds like you will see a nice gain. Are you only doing heads? I ask because you said LS6 springs, so either you have a stock cam or a baby cam. A cam is where the real power is.

armintheman

iTrader: (31)

oh no i ment im swaping the ls6 springs that are on the heads now with some comp springs. ya the cam i have now is a little bigger then a z06 cam. im getting a custom grind one though. im swaping heads, my stock ls1 intake off, and swaping cam. i should see night and day difference!!

ss.slp.ls1

iTrader: (36)

LS6 intake? Hell yeah you'll feel a night and day difference!

armintheman

iTrader: (31)

no not ls6 intake maybe bbk ported or victor jr

ss.slp.ls1

iTrader: (36)

I have heard of heat soaking issues with the BBK. With your build plans, your best bet is to just buy a LS6 intake. It's a very impressive piece and it will support a good amount of hp. I wouldn't upgrade from a LS6 intake until I was trying to make over 450 rwhp, or if I just had an extra 1k lying around to spend on a FAST 90/90.

armintheman

iTrader: (31)

idk man i heard alot of pluses on the ls6 also but i need an intake to hold up against nitrous

ss.slp.ls1

iTrader: (36)

Oh, then go with the BBK. I didn't know you were going to run nitrous. Do yourself a favor and have th bottom plate welded on. I have seen more than one situation where the screws backed out, even when they were thread locked.

johnLs1camaro

iTrader: (28)

id still say go with the ls6 intake manifold, its a good gain and your only running a 100 shot that isnt that much.

1CAMWNDR

iTrader: (21)

Once you port a cylinder head the factory cast flow numbers are irrelevant. If he has access to a ported 863 with a valve job that is a lot better than a stock 243. If it flows less than a stock 243 someone doesn't know how to work a flowbench; or the porter doesn't know what he/she is doing.

Take a 241, 243, and 863 head and send them off to have the same valve job and stage 2 CNC work done. Then tell me which one is a better casting.

Once ported the casting doesn't matter.

382ssz28

iTrader: (24)

I sent Carry @ ETP my stock 241 heads for a Stage 2 CNC. 316 I-241 E, @ .600". $1400.00 to the door with valves, springs, tit retainers. I had the LS-6 intake, (02 SS) and 85MM TB. Carry said 243's made a smidge more CNC to CNC. Keep 241's. Matched beautifully with Comp 595-598, 232*-234*, 112 and stock bottom end at time. Your Stage 3, 863's should flow better, I would think. I would try to find a deal on a FAST intake and 90MM TB. There was a difference. I ran 150HP of N20 and it loved it. Good Luck!

Bad Blue WS6

iTrader: (41)

i would also say go with the LS6 with your list of mods,,the fast looks to be to much intake for the setup your currently running,,,great intake for big cubes and lots of mods,,,,not so great for those of us that are not.
here is a LS6 intake for sale right now...post #27...

https://ls1tech.com/forums/generatio...ls-6-me-2.html