Has Anyone Seen This?
In reality, there is nothing wrong with the stock rods when being used for what they were designed for. The powdered metal rods are better than cast rods of the day, but in no means are suitable for sustained high rpm use.
Stock rods can and will last in a mild street strip vehicle, but once it's pushed harder, you're playing with fire.
It's generally accepted that stock rods are good for 450-500 rwhp because most applications with that power are not being held at 6k rpm for any great length of time. Even in a road race vehicle, the rpm's come down enough to give them a break.
In your case, I would go with a good quality I beam forged rod because although the rpm's are sustained, they are not overly high. (6500+).
When I say quality, I mean a set of callies or similar.
Stock rods can and will last in a mild street strip vehicle, but once it's pushed harder, you're playing with fire.
It's generally accepted that stock rods are good for 450-500 rwhp because most applications with that power are not being held at 6k rpm for any great length of time. Even in a road race vehicle, the rpm's come down enough to give them a break.
In your case, I would go with a good quality I beam forged rod because although the rpm's are sustained, they are not overly high. (6500+).
When I say quality, I mean a set of callies or similar.
You find deals and parts change. Found some late floating pin flat tops for the 5.3. Tore the 5.3 down and found it was junk. Scored a complete LQ4 core for $400. Was gonno build that then found a set of Gen IV floating pin flat tops (GTO type) for $180 and got em in the block with new rings and bearings. So here's what I'm maybe looking at.
A 6.0 with LS2 flatties, my ported 5.3 heads, and a custom ground LS3 spec cam with 226/229 .575/.578 112 on a lsa. I cools with lake water so it NEVER sees temps over 120.
Think the compression will be too high with 93 octane? Should be around 11:1 right?
A 6.0 with LS2 flatties, my ported 5.3 heads, and a custom ground LS3 spec cam with 226/229 .575/.578 112 on a lsa. I cools with lake water so it NEVER sees temps over 120.
Think the compression will be too high with 93 octane? Should be around 11:1 right?
Good luck with the boat!
You find deals and parts change. Found some late floating pin flat tops for the 5.3. Tore the 5.3 down and found it was junk. Scored a complete LQ4 core for $400. Was gonno build that then found a set of Gen IV floating pin flat tops (GTO type) for $180 and got em in the block with new rings and bearings. So here's what I'm maybe looking at.
A 6.0 with LS2 flatties, my ported 5.3 heads, and a custom ground LS3 spec cam with 226/229 .575/.578 112 on a lsa. I cools with lake water so it NEVER sees temps over 120.
Think the compression will be too high with 93 octane? Should be around 11:1 right?
A 6.0 with LS2 flatties, my ported 5.3 heads, and a custom ground LS3 spec cam with 226/229 .575/.578 112 on a lsa. I cools with lake water so it NEVER sees temps over 120.
Think the compression will be too high with 93 octane? Should be around 11:1 right?
If the 5.3L castings are still around 61cc, you're looking at about 11.5:1 with the flat tops. That should be fine for 93 octane fuel, and the cooler water temps will help, but you may want to back off timing a degree or two just to be safe.
I hear you. This is jet boat, not a prop boat. These things run two speeds. Idle and WOT. A lot of guys actually open up clearances by .002 because while the cooling system keeps temps down, in the bearings and cylinder wall A LOT of heat is being generated. Lake motors are really good at getting that heat out, but at the points of contact, the heat is high. That's what they say anyway. I really think it was an oiling problem that caused this whole fiasco to begin with. Can't complain too much. With a 5.3 (325 inch) it pulled 2mph faster than it did with a 466 inch big block Ford.
I'm just debating if I should look for some stock 342 heads or run with my ported 5.3 heads.
I'm just debating if I should look for some stock 342 heads or run with my ported 5.3 heads.
HOUSTON, WE HAVE A PROBLEM.... Maybe..
Got the rotating assemble together with the parts described above. The piston top comes just barely above the deck. With the head on, no gasket, and not bolted down the piston picks up the head maybe .030 or less.
Is this normal and will the head gasket take this space up or do I have a parts mismatch somewhere?
Oh, powder coated the various cover with chrome powder and added LS2 decals to the valve covers.
Got the rotating assemble together with the parts described above. The piston top comes just barely above the deck. With the head on, no gasket, and not bolted down the piston picks up the head maybe .030 or less.
Is this normal and will the head gasket take this space up or do I have a parts mismatch somewhere?
Oh, powder coated the various cover with chrome powder and added LS2 decals to the valve covers.
HOUSTON... I believe this is common among LS engines. The top of piston does indeed come just slightly above the deck surface. In the past I have heard this to be normal. I noticed this exact situation in my LS1 when I replaced the topend.
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Verdad Gallardo Ok, just checking. Maybe I'll torque a head down with one of the old head gaskets and verify. I need to check PTV clearance anyway.
Thanks for the info. Didn't have this issue with the 5.3.
Thanks for the info. Didn't have this issue with the 5.3.