PS. Thanks for reminding me to call those guys... I promised them a ride couple years back, but now thinking maybe offer them a new project. This boat be a good fit for that $$$$ crew..
Twins with Twins, Anyone?
- Thread starter kidturbo
- Start date
I've wondered about how well that would work for a while now. It's a shame they didn't take more time to do a good job. Bit that would have probably required removing the engine and stripping it downGarret AKA Cleetus McFarland did JB Weld on an LS engine...
Source: https://www.youtube.com/watch?v=OkMlsitbGIc&ab_channel=CleetusMcFarland
I wonder if you could cast a block with integrated heads. Pistons and valves would have to go in through the bottom. Would never have a leaking head gasket and no head bolts required. But a pain to assemble and service
Picked up the head that let go, and inspected the ones I dropped off. My replacements, are both out by 0.015 or so. Those heads been laying under a workbench for 4yrs, and came off a running engine Yet are out that far.
The other head off this boat engine cleaned up good at 0.020 and valves are now even with the face. The finish is smooth as any examples, and bolt hokes are still round. But the first head, needs another 0.010+ to maybe get rid of the divit.. So calling it scrap because it's so warped, the outer lying valves will be over 0.015 outa the head when all done. Centers will just be even...
If piston clearances aren't a problem, are there any issues having them above deck? The milling machine seems happy to cut them flush..
Ouside Valves
Center Valves
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The other head off this boat engine cleaned up good at 0.020 and valves are now even with the face. The finish is smooth as any examples, and bolt hokes are still round. But the first head, needs another 0.010+ to maybe get rid of the divit.. So calling it scrap because it's so warped, the outer lying valves will be over 0.015 outa the head when all done. Centers will just be even...
If piston clearances aren't a problem, are there any issues having them above deck? The milling machine seems happy to cut them flush..
Ouside Valves
Center Valves
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Oh yeah, my machine buddy taught me something new today.
Seems someone invented these neat little temperature sensing freeze plugs, that have a pop out dot in the middle to alert the machine shop if engine parts were overheated. And last shop stuck some in these heads..
Winner Winner
But they don't tell ya the set value.. What fun is that...
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Seems someone invented these neat little temperature sensing freeze plugs, that have a pop out dot in the middle to alert the machine shop if engine parts were overheated. And last shop stuck some in these heads..
Winner Winner
But they don't tell ya the set value.. What fun is that...
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Well, it's not actually a temperature sensing freeze plug,, but a temperature sensitive tab that is pretty common in the used or reman engine market. They melt when the temp gets above a certain value, so if you go back to where you got the engine and say it failed, if the tab is melted, warranty void. Was that one actually melted? Doesn't really look like it ..Oh yeah, my machine buddy taught me something new today.
Seems someone invented these neat little temperature sensing freeze plugs, that have a pop out dot in the middle to alert the machine shop if engine parts were overheated. And last shop stuck some in these heads..
Winner Winner
But they don't tell ya the set value.. What fun is that...
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According to some example pics I found, these are melted.
gowesty.com
Guessing these were 225F tabs, as I did see hit 235+ when I shut it down for the last time. Also ran that engine at in gear idle for 30 minutes in 220's when that turbo exploded on the other engine a month before. We bumped a sand bar while looking at the turbo carnage, and plugged the seastrainer on this one. A major storm blew up, and didn't have much choice but to keep one running, or get blown out to sea.. And then she started acting up shortly after..
Engine Overheat Indicating Melt Tabs – GoWesty
The melt tabs we put on all the cylinder heads and rebuilt engine long blocks are just the messengers reporting the truth: If they are melted, the engine was overheated. They are just the GoWesty messengers, and should not be shot! Hopefully, this article will shed some light on how these melt...
gowesty.com
Guessing these were 225F tabs, as I did see hit 235+ when I shut it down for the last time. Also ran that engine at in gear idle for 30 minutes in 220's when that turbo exploded on the other engine a month before. We bumped a sand bar while looking at the turbo carnage, and plugged the seastrainer on this one. A major storm blew up, and didn't have much choice but to keep one running, or get blown out to sea.. And then she started acting up shortly after..
Found this not to old thread on head milling.
www.duramaxdiesels.com
Since not interested in reseating all the valves and shimming springs, thinking I'll search around for a better pair. Also not sure how much milling each will effect the Banks charge cooler intake, or the very rigid jacketed crossover exhaust pipes. Seeing in thread above how cutting 22thou impacts the factory Y bridge fit, that could be the deal breaker. Everything is so tight on specs right now, don't know if I want to risk stressing some big $$$ bolt on parts to save a couple bucks on the heads. Gonna have to go digging in the old scraps box again..
Head milling
Ok I’m getting conflicting info on resurfacing heads lbz. Machine shop said they took off .022 thousandths. But cut the valve seats and moved the valves with it. Running a grade C mahle gasket. Anyone have an issue with this?
www.duramaxdiesels.com
Since not interested in reseating all the valves and shimming springs, thinking I'll search around for a better pair. Also not sure how much milling each will effect the Banks charge cooler intake, or the very rigid jacketed crossover exhaust pipes. Seeing in thread above how cutting 22thou impacts the factory Y bridge fit, that could be the deal breaker. Everything is so tight on specs right now, don't know if I want to risk stressing some big $$$ bolt on parts to save a couple bucks on the heads. Gonna have to go digging in the old scraps box again..
Ok, I traced the history of these overtemp dotted heads. And as you suspected, they came from a major engine reman. My GM tech buddy reminded me, I bought an engine from local guys shed who was moving same day. He purchased an LMM reman long block, installed it, but claimed it had a bottom end noise. They sent him a replacement, and he tossed this one under a tarp behind the garage. It had like zero hours, but had gotten rained in. We pulled those heads, and had them clean and trued again when it acted up first time in the boat. So it's likely the've had around 0.015+ milled off before this last cutting. So am going to guestimate that's about the max ya wanta take before cutting valve seats. Makeing my spare castings within specs to cut, if truely stock.
Some straight ones.. lol
Know in a few days. I'm going to mil these spares first and check valve height. Have another possible LBZ set in our spare engines collection, but no idea of condition.
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New heads not in the budget this time around. Fuel getting turned down to sub 800hp range, where I know it lives happily with 40psi boost. The next player can put some cast iron heads on both engines, and likely resolve all the gasket issue. Or this next head set might be fine for decade, if someone doesn't overheat em like I did.
After considering all head gasket experience gained by my friends at Innovation, who invested thousands of hours working with Curitis H back in the early days trying build a LB7-LBZ Navy version, ya gotta respect the data. Their data all says OEM aluminum heads won't stay torqued when run at over 800 hp in continuous high RPM environments. Simply a difference in expansion rate. They could never get them to hold and pass the 24hr at 80% to WOT test.. Yet at 700hp they stick fine.
Boat runs 80mph plus with em limited to 800hp. Anything above that, milage remains questioable.
After considering all head gasket experience gained by my friends at Innovation, who invested thousands of hours working with Curitis H back in the early days trying build a LB7-LBZ Navy version, ya gotta respect the data. Their data all says OEM aluminum heads won't stay torqued when run at over 800 hp in continuous high RPM environments. Simply a difference in expansion rate. They could never get them to hold and pass the 24hr at 80% to WOT test.. Yet at 700hp they stick fine.
Boat runs 80mph plus with em limited to 800hp. Anything above that, milage remains questioable.
Sounds like an aluminum block would help with that different expansion ratio problem 
Ask PPE to Sponsor you... show them how it would be good marketing for them.
Was actually just getting ready to call em.. ARP ya mean??
Looking for the biz card of the rep who checked these engines out at UCC.
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Looking for the biz card of the rep who checked these engines out at UCC.
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Ah, I thought about that after hitting reply..
Guess I could ask. Couple of my OG PPE boat videos, are touching the 100k views mark last I checked.. What's that equal out to per click??
Guess I could ask. Couple of my OG PPE boat videos, are touching the 100k views mark last I checked.. What's that equal out to per click??