1968 HEMI Stroker Drops Valve - Can It Be Saved?

all right I got a 426 Hemi with a mechanical damage but it's stroked out to a 572 cubic inch so we're here tonight to remove a cylinder head to see what went wrong can it be saved [Music] Nick's garage is supported by Atlas equipment and K tool International hi I'm Nick and welcome to my shop well what do I have here one of my favorites the 426 Hemi yeah it came in because of course it needs some help but anyways I just wanted to say this engine came in while we're at the barbecue party here at the shop uh a while back and this engine belongs to Jim in Ontario but Bruce is the man who brought it into my shop during the party and this is a bunch of 1964 Plymouth Fury it is a 1968 Hemi but it's stroked out to a 572 cubic inch Bruce brought it in from Ontario and asked me Nick you want to take a look at this engine because apparently still the number one dropped a valve all it took was a quick look with the borescope to confirm the bad news if we look here I don't see no valve all I'm seeing is evolve guide but I don't see the valve so apparently it dropped an exhaust file and some people want to know what happens when you drop a valve it means that part of the valve broke off so it fell in the cylinder while it was running now did it break because of mechanical deference over revving bad valve I do not know so we're here tonight to take apart this take off the cylinder head and take a look and see what kind of damage it's done all right [Music] here we go everybody it's time to tear open a Hemi [Music] you know if you guys want to know what a draw valve damage can do I'm going to tell you what I've done with my brother and ice at one time we took an engine again at 426 semi and we took a risk at revving at 8 000 RPM and you know not everything goes good and this is what happened if you guys take a look here this is a 426 semi here's the intake valve two and a quarter inch in diameter yes we rev that high now it was the bits of the valve Too Close was the valve screen too weak we took it to 8000 RPM and we took a risk at it and this was the result you know by the way when we dropped the valve on the 426 semi that blown to my brother he broke on the dynamometer we were just doing some r d reaches and development and you know we took a risk you know we said maybe it's a 50 50 chance so we worked on something with piston to valve clearance and of course RPM versus the cam versus the wall spring pressure and the result was this catastrophic at 8 000 RPM anyways now we've been at 8 000 again years later and we had no issues at all but you know you know you learn as you go along so in this case this one just came in with the same problem dropped an exhaust valve so uh let's take off the cylinder head to where we've got foreign came in without the intake manifold it was on the side I just wanted to show you guys that apparently this is a roller cam as you guys can see this is a solid lifter roller camshaft so with this intake manifold on it this is a cross ram intake manifold for 426 semi equipped with two Holley carburetors this is the way it came on on a race time it came with a cross ramp two Holley carburetors and from what I see this is not a street Cruiser this is an engine that's been raised so I'm sure there's a big cam I'm sure the valves are maybe close to the Piston or the Springs are weak or it was over revved or whatever so we're going to do a research and see what went wrong with this you know after all you know you don't want to build it and then the guy takes it and puts it in the car and then revs it up again and then he drops another valve so our job is to take a good look strip it down do some research and see what went wrong [Music] I have to thank one of our viewers I don't remember his name he made the stool and sent it to us and we opened it up at mail time and it's pretty cool you know when you unscrew the spark plug you put the tool down here like this and then you just pull it to the spark plug like which I just did here let me show you let me take out another one first of all we have to loosen it let me see this look there you go cool but silver number one there's no spark plug I guess it got damaged or for some reason they took it out but let's get started you know I've taken apart a lot of hemis in my in my lifetime quite a few quite a few and uh very rare I find a Hemi with a drop valve or any engine matter of fact okay I'm going to start by removing the valve covers now [Music] you're probably saying why am I using a power tool there's 10 nuts removed on each valve cover and it's an easy job you don't need to use Muscle and that's all for that reason I'll use this uh electric impact and we'll have them removed [Music] you know when you have a mechanical damage sometimes you can have a bad push rod or any kind of Damages you know walk around ship Bend to Walker Shaft or whatever so we gotta look at everything you know mechanical damage and I'm sure this happened at a higher RPM range so like I was telling earlier when I did my brother's engine we took a risk at it and we said it's a 50 50 and we expect it maybe to go good or not well we knew what happens we took him didn't go well that was a while back [Music] you know ever since we bought that Hemi cooler in 1974 my brother and I have always owned hemis since then so we're going back 52 years and uh we're still playing around with tennis [Music] you know on a 426 semi you've got to remove the spark plugs and then of course the 10 volts cover screws because if you don't remove the spark plugs both cars aren't going to come off even though you move the 10 nuts around the valve cover okay here we go okay did they use silicone on this too it doesn't want to budge oh my God all right [Music] for some reason it's really uh it's really tight [Music] I noticed that these valve covers do not have a ridge over here in the top I guess for the reasons the crossroad may take manifold I'm not sure but we're gonna find out [Music] now imagine this being on the car you're erasing it it's a weekend you're racing and you want to check a valve adjustment you got to go through hell to open up the valve cover there we go finally okay what have we got here [Music] part of the exhaust valve is right here still there okay let's take off the dipstick here we go let's take off a few Locker shafts or should I say uh take off a few walkers you know what now that we know that the head of the exhaust valve dropped into the cylinder but the valve stem is still in the cylinder head so now you're going to be very careful when you remove this that uh that the spring doesn't push out the valve stem and it goes into you it could be dangerous so you got to be careful so let's uh remove it slowly and most likely it's probably jammed in the valve guide but we don't take any chances let me turn the engine around I got a car behind me so I'm going to just turn around the engine so if anywhere it's going to go it's going to go towards the open area of my shop so let me turn this engine around and here we go okay let's be careful here the intake valve is not a problem I'm going to remove the push rod on this one here we go [Music] and the intake push rods are much shorter than the exhaust spot about an inch on a Hemi it's okay let's put this here now let's work on the exhaust [Music] you know I'm gonna have to turn the engine over so I could get the lifter to go down on the uh on the lobe see this so now can I turn the engine over I'm not so sure it doesn't matter you know what else like all the lockers for safety reasons I don't want to take a chance and remove it by itself let's take it slowly or crack them all loose [Music] we're going to remove as many as we can yeah and I notice they have a double spring on this yes Double Springs okay and we know this is uh racing purposes [Music] I can't wait to remove the cylinder to see what kind of damage this thing has I'm sure our viewer or should I say the owner of this engine it's probably watching to see what kind of damage he's got in it and I told him we're going to make a video on it and show it to him on camera so uh let's take it apart [Music] [Music] it's nice K2 setting me up with the tools here makes my job a lot easier [Music] and crack the inside a little bit [Music] okay so we have like I said it is a 4267 it's got 17 bolts that hold this cylinder head you got eight on the lower five on the center and four inner studs on the inside okay so what I'm gonna do here now is if I were to turn the engine over I doubt it very much if it turns overpass I'm sure that the valve the head of the valve on the exhaust valve is stuck somewhere in the chamber between the head and the piston let me see if I turn the clock away see what happens so I could bring my cam down so I can remove the push rod no no way so let me see if I can back it up nope the ball gets loose so you know what we're going to try to remove the cylinder head slowly we're going to take off the shaft now that I slacked the head off I'm going to move the shaft slowly so I want to make sure that this spring does not fly into our uh face so we've got to be very careful [Music] I'm gonna just crack it loose [Music] [Applause] [Music] and it's like this one I forgot one [Music] no it's tight so I gotta take it off you know I wanted to rotate the engine so I could bring the valves closed so I can remove the push rod so much easier but since we cannot rotate the engine and jam because of the drop valve we have to remove it in this way okay here we go [Music] [Music] foreign [Music] so far the guide is stuck there okay so far so good just be careful it doesn't fly out better walk around the other side here we go okay now take out the push rods this is The Pusher that should be bent in case it's not bent you know you want to see was it a mechanical difference was it a weak ball spring was it not enough clearance we don't know it depends if we're going back with the same cam are we building it as a street Cruiser I don't know but I'm just curious to see what caused it whatever you do don't stand in front of the uh this one here I'm gonna start removing bolts on the inside or should I save the studs and these are Factory on 9 16s for some reason these are 5 8 why I don't know it doesn't matter like I said this has been modified fixed up upgraded whatever you want to call it here we go [Music] I'm sure from the looks of this engine this was a race engine before sure did you cruise with it I don't think so it doesn't matter we're gonna build it from scratch they want to build it for racing not a bomb do they want to build a full cruising not a problem you know with these same as you never know sometimes they've been there when they were sold from the factory there were Cruisers and then they became street cars then it became Dragsters on the drag strip race cars some of them went back on the road someone cruising someone into restoration hard to say but anyways it doesn't matter I haven't met the customer yet I will meet him let me take it apart and then we'll take it from there [Applause] did you guys noticed if you take a look look at this one two three and this one's further out it's ready to pop up but it won't because I guess the valve stem is stuck on the valve guide it won't allow it to come out if you take a look it's about a quarter inch further out than the other three exhaust valves so I'm going to remove the cylinder head right now [Music] gotta be very careful because if that pops without spring pressure that thing is going to go flying I'm prepared just in case believe me [Applause] I'm going to stand in front of it but got to be careful but what we're going to do is we're going to tap it here just for safety shoe for security reasons I'm going to turn the engine away from my car like so now [Music] I'm just going to remove the Lash cap I guess it's stuck there nope this is what's called A Lash Gap you guys this is like a little cup that's between the valve stem and the Walker so this runs last caps okay so I'm going to put this over here and now watch out in case this goes flying I guess it's stuck there okay so I think we're pretty safe okay let's take off the cylinder head and see what we got under there the moment of truth it is under pressure slightly but it seems like it's stuck there so I'll take my chances and pull off the cylinder head right now don't stand in front of the uh okay here we go okay here I go thank you now what have you got wow where's the valve where's the vault well there's a valve guy [Music] where's the vault that's strange oh my God we have another issue there look at this so this thing went bouncing around for one this is strange very strange where is that exhaust valve the head of the valve or is it not here something went bouncing around here [Music] where'd it go now it's a big piece come on there's a ball stem [Music] Okay so there's a mystery here it probably went out the results no I can't maybe it did it's probably stuck in the headers all I know is it's not here it could be in another cylinder maybe I don't know you think it bounced around look something happened here the damage occurred in cylinder number one and cylinder number seven has damage and if you could take a good look that was being hit with a piece of chunk of metal now it was that part of the exhaust valve head from cylinder number one that went over here did it go through the intake manifold and it is possible if you take a good look right here look there's mechanical damage here in that chamber you know this if you're going to use this cylinder head again it's made out of cast iron we're gonna have to mind the flex the head make sure there's no cracks the head which is 1.94 in diameter it's a humongous piece did it get chewed up chopped up I think it went out the exhaust on the header did it go through the intake manifold through another cylinder which it did in this case look at number seven there's a mechanical deference if you take a good look cylinder number seven did not lose any valve so something went in that cylinder strange from one end to the other you know what can it be possible it's in another side I'm going to remove the cylinder head just in case I'm curious I'm very curious I know that something fell in that cylinder and this cylinder did not drop any valves whatsoever but look at the damage on the piston something was severely in that cylinder okay I'm taking off this is cylinder head also [Music] you know uh the wind effect or the turbulence or the vacuum that's caused inside the intake manifold is enormous so it's possible that it may probably one on this side also caused them damage so for that reason I'm taking off the cylinder seat take a look the reason the Vodka was being difficult to remove it's because he's got the tube seals inside to prevent oil from going down the spark plug into the cylinder when you are removing or installing spark plugs on a Hemi which very commonly known which are I'll show right now let me just remove the buff cover see the tubes are stuck in their four sleeves [Music] foreign [Music] there we go these are sleeves right here this is not original these are aftermarket and you can see there's a rubber o-ring inside and this makes it a snug fit so whenever you want to do a tune-up or change the plugs you know on a street Hemi without the tube seals when you remove a plug oil goes down the cylinder then you put the new plugs in then the moment you start it up within a minute or so you can have a lot of boost smoke coming out of the exhaust which is normal so this is the reason what these things were invented for you know yes of all the years I've been working with Amy's with my brother for a long long time we only damaged one Hemi after so many years it's a pretty good record well you know what if you're not trying hard enough you'll never break anything but sometimes you got to know your limits and you know you have to know what you're doing you get a close tolerance and you risk it you try it it's trial and error nothing wrong with that and you know sometimes you expect it and it is what it is you know if you don't try things you don't know your uh your limits so this is what I do yeah it's a big Mudder 572. okay one two three this one I can get out this one is jammed okay I can't turn the engine over oh maybe I could let's try it now let's see if it turns over oh it's jam oh okay something's wrong there got jammed again look I'll bring it up there it's jammed what happened there's nothing here to jam it so you know what maybe maybe there is something loose on this side [Music] [Music] I just wanted to let you guys know if you're wondering if you guys take a good look here that this is a roller cam and when you have a roller cam you have a bar that goes in between it because the roller lifter has to stay in place go up and down on wheels on a flat tap in a hydraulic or it's all a lifter that lifts has to turn so it doesn't wear out so you don't use a bar on a hydraulic lifter because you want the flat topper to turn as the cam turns you want the lifter to turn on the loop on the roller cam it's the opposite you got a bar you got wheels they'll roll off the cam lobes and of course you have a bar to hold it from turning around so this is the purpose of the bar and here's how you can tell this is a roller camshaft I'm ready to move this cylinder head and it doesn't matter here we go oh wow check it out that valve was falling around everywhere check it out yeah we need some oh my God look at the scratches on this cylinder oh yeah it's got some damage that valve just went around everywhere so you see it went from that cylinder to this cylinder to that cylinder and if you guys take a good look look at the damage we're going to turn the crank over look at the damage it did to this piston and as you can see this did not drop any violence whatsoever look at the chamber this one this one and this one slightly [Music] I'm gonna see if the crank turns over now the owner that doesn't have damage is cylinder number eight look at that cylinder number eight has no damage whatsoever this one has damage I'll bring them up one by one all of them here's another one check it out it was just banging around in every cylinder and then it'd be pick up number six this is the one that took the severe damage they're gonna [Music] then we go on this side which originally the valve broke off on cylinder number one entangled anywhere between the intake manifold from one cylinder to another and there's another one here with no damage so two pieces are great cylinder number five cylinder number eight are in perfect shape meanwhile all other six Pistons were hit by the floating valve wow this is what a diamond check this out over here that's still the number seven and let's check number three just got nicked here on the corner all right and here this is the one where it fell wouldn't need sleeves yes I guess it would so we need new business we might need a few cylinders or sleeves for cylinders we need eight new Pistons and of course now what we've got to do is of course we need to do a valve job but first of all we got to check all these chambers that don't have any cracks because this was a metal to metal contact and you want to make sure that that the uh Chambers are not cracked but you know before you know you can have coolant inside the chamber so we got a lot of work ahead of us here I'm gonna have to strip everything down take a look at everything and then of course we're going to check everything piece by piece and this is the second time I've seen a heavy drop a valve in all my life my brother had a chamber of damage and one piston why because when this valve dropped it got stuck in the Piston it stayed there and then it traveled through the engine like this one did this one went for a ride anyways there you have it you guys we've got a 572 Cuban chain here that belongs to Jim from Ontario so Jim if you're watching there you have it this is your engine this is your Hemi so we're gonna tear down all the way go through it and we'll get back to you and you guys thanks for watching it's zero Nick's garage hope you enjoyed our teardown on the Hemi you know this is what comes into my shop you know and my job is to get them fixed and put it back in the cars and make sure they run great and you guys if you look down below the video we have a whole bunch of merchandise that you guys can buy so whatever you like buy it love it wear it and enjoy it and help spread the word of Nick's garage and if you have some time check out our patreon page we have extra content and you guys can watch it and take it from there and we'll see you next time oh [Music]

Channel: Nick's Garage

Views: 290,024

Keywords: Hemi, Nick Panaritis, Nick's Garage, Indy Auto, Engine Builder, Dynamometer, 440, six pack, mopar, Chrysler, plymouth, dodge, classic car, muscle car, charger, Carburetor, Dyno room, hemi, MOPAR, Big Block, Road Runner, 1969, Drag Racing, Chevy, Bow tie, Classic, Antique, Big three, Father, Son, 426, heads, valves, valve job, horsepower, Chevrolet, Dual Quad, Tune, Dream Car, Long ram, 300J, Letter series, torque monster, Shaker, Rocker noise, Plymouth, K Tool, Atlas Equipment, 572

Id: LBtWyC2Yxuk

Length: 31min 38sec (1898 seconds)

Published: Mon Jun 19 2023