5.3 L33 cam specs...marine use????

garys 68 · 09-25-2009, 02:51 PM

Does anyone have the specs for an 05 5.3 L33 truck motor.
I just want to make sure there's not too much overlap for marine use.

garys 68 · 09-28-2009, 09:26 AM

TTT, anyone????

ramdaspadhye · 09-28-2009, 02:11 PM

What would overlap have to do with it being a marine application or not? Not being a smartass, just asking.

garys 68 · 09-28-2009, 02:21 PM

Inboard boat motors run a wet exhaust. Water is mixed with the exhaust just past the manifold to cool the pipes and muffle the noise.
Cams with a lot of overlap tend to pull water back into the cylinders (reversion).
You can run dry pipes (water jacketed exhaust manifold and pipe), but the tend to be VERY LOUD.

Quote:

Originally Posted by ramdaspadhye

What would overlap have to do with it being a marine application or not? Not being a smartass, just asking.

abot316 · 09-28-2009, 02:28 PM

I would imagine its 114' or larger considering its designed for smooth idle and emissions

here are other thoughts
http://ls1tech.com/forums/generation...cam-specs.html

garys 68 · 09-28-2009, 02:57 PM

Yeah, I found the specs on the LQ motors (below), but not on the L33, I'm betting it's about the same as the LQ4. Most marine cams are in the 114-116 LSA range with about 200 duration, so it should work fine.
I was just worried that the L33 with the LS6 heads might have a hotter cam.

'99-'00 LQ4, Int. 191 0.457 114
PN 12560967, Exh. 190 0.466
'01-'06 LQ4, Int. 196 0.467 116
PN 12561721, Exh. 207 0.479

Quote:

Originally Posted by abot316

I would imagine its 114' or larger considering its designed for smooth idle and emissions

here are other thoughts
http://ls1tech.com/forums/generation...cam-specs.html

modracer33 · 09-28-2009, 03:18 PM

Quote:

Originally Posted by garys 68

Yeah, I found the specs on the LQ motors (below), but not on the L33, I'm betting it's about the same as the LQ4. Most marine cams are in the 114-116 LSA range with about 200 duration, so it should work fine.
I was just worried that the L33 with the LS6 heads might have a hotter cam.

'99-'00 LQ4, Int. 191 0.457 114
PN 12560967, Exh. 190 0.466
'01-'06 LQ4, Int. 196 0.467 116
PN 12561721, Exh. 207 0.479

Found this on another thread in the forum: