ls2 heads
 

Does anybody know what type of valves are used in this motor or better still have access to the head specs?Thanks

Are you referring to the LS2 heads on the 6.0l all aluminum GM motor used in vettes/GTOs?

yes.Know what sort of valves are in them?

Fast,
Combustion Chamber Volume: 64.45cc
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Valve Angle 15º
Solid Stem valves

Flow .200"-.600"
Intake Exhaust
136 104
195 135
237 157
260 169
260 180

Bob

If you trust this guy http://www.quicksilvertrucks.com/for...read.php?t=216

Valve Material: Stainless Steel, Hollow Stems, Na filled Exhaust

The LS1/LS6/LS3 heads have the hollow/sodium filled valves. The LS2 heads use an 8mm solid valve on both sides.

Thanks Guys and great to hear from you again Bob.Trust all is well.

Carl.

LS Series Valves
 

The LS6 & LS3 had/have the hollow stem sodiums, the LS1 did not. The LS6 & LS2 heads are extremely simular castings, the only difference being the sodium valving in the LS6 heads, with "yellow" valve springs, which simply denotes seat pressure.

if youre looking for a power upgrade better can take the L92 truck version head used on the ls 2 blocks and complet l92 truck engine they have bigger valves(stainless steel) and better flow!

2.16" Intake Valve
1.59" Exhaust Valve
70cc Combustion Chamber
260cc Intake Runner Volume
90cc Exhaust Port Volume

Flow Data:

Lift, Inches Intake Flow @ 28" Water

With 4.125" Bore
Exhaust Flow @ 28" Water

With 4.125" Bore

.100 79.2 57.8
.200 153 114.4
.300 225 147.2
.400 276 170.3
.500 309.6 183.1
.550 323.2 186
.600 332.2 189.5
.650 327.7 191.1
.700 330 192.6
.750 317 195
.800 317 195.8

lots of corvette or pontiac gto owners buy these heads as a low cost ($450 These heads are sold complete with valves, valve stem seals, keepers & retainers.) powerupgrade

I am building a ls 2 engine whit this heads in to a 21ft phantom

Very true but I believe a L92 head would be too much for a stock cube 346 LS1 with their big 260cc intake runner. The AFR 205 head with its 205cc port can support power well past
7K rpms with the right combo. I would use the L92s on larger bore motors like a 383 or 402 or bigger.

youre right the requere a minium bore of 4.000" because the have big valves and the valve angle,so you can NOT use them on a ls1

Is anyone making headers or exhaust manifolds for these LS engines? How about starters and other marine accessories?

The rumors seems to indicate this is the last year of the 496. And with these:
http://www.gm.com/explore/technology...LY6_Marine.pdf
http://www.gm.com/explore/technology...LS2_Marine.pdf
...it does not seem like the LS is going to have problems making lots of power.

Thanks for those links. I did not know GM was moving that way with the LSX engines. As for power they can make it!
My LS1 has a basic heads and cam package and makes
420rwhp @ 396rwtq which is around 475 hp at the crank out of 346 cubes. A friends 402 LS2 with AFR 225 heads and cam makes 567rwhp @ 521rwtq which is well over 600hp at the crank. He traps 130+ mph at the track to my 117.

Great info guys.I think more people will be using this setup.Thanks for all the help.

about the headers a orderd a pair of cmi headers after calling them ,the tell me the fit .
about the rest marine acc.I ll get mine engine this week and then I look but it s based on the bolt patern of a 5.7 so the bellhousing must fit ,but when I have it I will post my results here for the raw waterpump I have a serptine driven mercruiser oem maybe have to made some mods but c ant be much but I ll post it all .
by raylar the also did it but don t know what heads they used had tried to call them serveral times also send e mails but no results but that s a very nice looking engine (lsm 550)

bor