blowed it up yesterday |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Posted: April-02-2018 at 9:10am |
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Pretty sure I dropped a valve or jumped the chain last night putting her away. Gave it one little blup running on the flusher to clear the risers and all motion ceased. it actually acts like its way over advanced, not a mechanical clunk type locked up. Im gonna go pull the plugs out today and Ill let you know the prognoses when I return.
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Jesus was a bare-footer.............
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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dropped #5 intake.
Crap. |
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Jesus was a bare-footer.............
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Bummer. Did it drop a keeper or break the head off?? What engine??
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Keep it as original as YOU want it
1978 Mustang (modified) |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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5.7 GM. left handed so no biggie.
Not sure whet happened yet. water in 5 and 7. Electrode is burned right off #5. All others look perfect. Im thinking the head cracked and dropped the seat. Still pondering tearing the heads off or just ordering a long block. Not really sure yet. Too bad Im not ready to build that stroker. |
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Jesus was a bare-footer.............
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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I would be shopping the wreckers for a relatively low mileage vortec runner out of a Tahoe or something of the like. It would cost you an intake and the need to run an electric fuel pump but they make nice ski boat motors with the roller cam and modern head design. Anything under a 100k miles is likely to rust out before it wears out, and I trust the used factory motors more than most of the aftermarket long blocks...
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Thats an idea. I have to run the cast iron intake and I can get the factory pump easy enough. That gets me 298 vs 280 horses as well. I would have to tear it down and change the head gaskets and casting plugs though. Think there is difference in cams?
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Jesus was a bare-footer.............
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shierh
Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
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Thought vortec was a ford engine
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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I have helped swap a couple used 5.7 vortecs into open bow malibus on the lake in place of blown up factory 260hp mercs. Pulled the plugs and replaced with brass (although I am not sure but I think we ended up pulling brass plugs out of at least one of them. We didn't mess with the cam and both boats picked up 3-4 mph on the top end and are hotter on the pull than before the swap. I am sure there is likely a better cam option out there but I don't think I would bother. The first one has a solid 400 hours on it now and acts like a new motor. Definitely would have rather run a mechanical fuel pump over the not super reliable aftermarket electric options but it was a reasonable trade off – spending a little time to mount/wire and plumb up a carter electric with an easily replaceable relay and oil pressure switch that would last a few years and swap out relatively cheaply would probably be worth the effort. Everything seems to be getting a bit harder to find these days, but one of the two was a 90k engine for 500 on craigslist, the other guy went the salvage yard route and it was more money but they did knock off a few hundred bucks because he was going to tear it down far enough that the salvage yard didn't have to offer a warranty.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Correct but GM makes them for Ford!!! |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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I've done the same as Joe
New intake manifold for the Vortec head bolt pattern, same exhaust, electric pump and brass "plugs" whatever you want to call them. Your carburetor and distributor and the rest of the bolt on parts and you have a good running engine with plenty of power. Edit...........it may not be too easy to find a cast iron intake to fit since you run in that salty ocean water |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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DVskier
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Yeah Pete, Vortec is definitely GM.
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8122pbrainard
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Tim, You actually thought I was serious? |
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shierh
Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
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what is the ford pu gas engine called, Damn things all sound alike . Etech vortech, v tech, bluetech whatevertech
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3734 |
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Electrode burned away and gasket blown between 5 and 7 classic detonation damage.
Sorry. Detonation is usually caused by lean burn which makes the cylinder burn hotter. Common cause on a carbureted engine would be an intake leak letting extra air in to the damaged cylinder. Excessive timing can certainly cause this also. A dropped valve is also an indication you had excess heat in that cylinder. Find the cause before repairing so the same problem does not hit your next engine. If your pistons and cylinders are good you could just install new heads. A Vortec head upgrade is a great option but a Vortec manifold would be needed also. For the cost of both these you are close to cost for some new aluminum performance heads or Dart cast iron performance heads. From 0 to 5,500 RPM on a 350 the Vortecs are really good. |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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*
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Jesus was a bare-footer.............
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Jesus was a bare-footer.............
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shierh
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pretty ugly.
wonder how long it had been leaking? what is the composition of the build up above the valve? is that rust ? if so its been leaking for a while id say. also is that the exhaust or intake, I cant tell from photo, if exhaust then do you have exhaust manifold crack or riser issue? If this is vacuum leak induced it makes me want to do test on mine with wd40 to rule out leaks. |
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TRBenj
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exhaust valve is usually smaller than intake valve, no? |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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How about the steam engine in Pete's Paddlewheel Nautique ? Was great for shallow water but the rope kept getting tangled....
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6150 |
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Yep much smaller. |
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shierh
Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
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Likely, it looks like water had been pooling from above, note the build up of rust where the top of the valve would have been? Think she sat for a period of time with water sitting in the port. I would Say there is a riser and or manifold issue there. |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Agreed, or possibly cylinder or head water jacket |
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Donald80SN
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I have 281 000 miles on my 2004 Tahoe with the Vortec (326-328, not 327) motor. Those Vortec's are great. I know Joe gets over 300K before any of his stuff is broken in.
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1980 Ski Nautique SOLD Back to Cypress Gardens
2002 Sport Nautique, GT-40, FCT2, Cover Sports, Tower Bimini, Inc., Wet Sounds Audio System, Star Gazer Wake Edition S. 1968 Ski Nautique, Project. |
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3734 |
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Don, your Vortec is the LS design engine. No parts are compatable with the early Small Block GM design. The LS family of engines is a ground up new design.
You are correct, they are very good. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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That is a lot of trips to the Sugar Shack! |
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bwinn
Senior Member Joined: July-13-2009 Location: ct Status: Offline Points: 396 |
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They will definitely go 300k. Might need a lifter or two at some point. |
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Gary S
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Maybe you can hook up the AFM on it too so that when you don't need all 8 you can save some gas
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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The lumpy rust is from a past riser failure or two years ago. Its gray and sooty over old rust. Except for the new rust from the blow up of course. Manifolds and risers are dry-port< 1 year old and pressure tested OK.
This is the head I never touched. I was told when I bought the engine that it was freshly reconditioned. I think it was done on the cheep, that corrosion was always under the seat and three years later the seat cracked and fell out. Knocked a nice big hole in the water jacket too. yes, #5 exhaust. I just picked up a good running 6.2 (383) that will be going in soon. |
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Jesus was a bare-footer.............
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3734 |
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The 383 will really wake up your boat. " Can you say, Multiple deep water barefoot starts no problem"
It is hard to believe till you drive a 383 how much difference there is between a 350 and a 383. Horsepower is not that big a difference but the torque a 383 makes as low as 2,000 RPM's make them feel much larger. than 383 cubic inches. I hope yours has the longer 350 5.7 inch connecting rods, it makes the engine much more reliable. |
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