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You are here: Home / The Daily Pose / GMC Motorhome: What makes up a good motor core, part 2

March 1, 2018

GMC Motorhome: What makes up a good motor core, part 2

Sorry Cedric, I’d like to talk a little bout all the motors we are getting in to build.  Actually we got in a hi dollar device that will make our texture coating that much more finished …and that starts for you buddy so enjoy me talking about a motor that has nothing to do with your coach….see guys Ruby is spoting one of the 6.5 AM General military Hum V turbo diesel motors ….so don’t go to sleep Cedric….Ruby will be back in the news soon.

So now, for all of you 403 & 455 Olds motor enthusiasts I’d like to show you some things while we break down this recent 455 core purchase.  See I feel strongly, especially with old motors like this that the core provenance is something to look at.  After so many extreme heat cycles, a motor out of a GMC has to be carefully inspected for stress cracks, warped surfaces and if the motor had the trauma of failure these issue could multiply.  This is why I seek low trauma (running motor when it was taken out) and if we can find a “J” head (low compression) motor with minimal wear….THAT’s what makes up a good core.  So lets look deeper into this motor I started describing yesterday…if you didn’t read yesterday….go do that….we’ll all wait for you…………………………………………… hey, now that you see the motor lets talk a little bout what we found when we went in the block:  Motor breakdown 12  Remember yesterday when I was trying to draw some pretty far conclusions…erase that all….I was wrong, this is an ORIGINAL, non rebuilt motor!  The loose timing chain we could feel had good reason…….it was sitting on an original plastic cam gear!!!!  Motor breakdown 18  This is what you want to see…….. no ridge on the cylinder wall  Motor breakdown 7 and an original plastic timing chain gear.  The timing cover plate where the water pump was mounted is pitted a bit at the bottom but clean up top….. It’s been sitting for some time with water in the pump..no oil got in or the corrosion would be less.  Motor breakdown 15 and the crank is smooth with little wear at standard……..Youweeee we have an original core!  Motor breakdown 19  The oil pan revieled some sludge but no metal…the oil pump and pickup was original…….we’ll fix that but overall the pan hasn’t said anything bad yet.  Motor breakdown 13  All the valve train components are nice and the lifter had to be pried out of their holes….. Motor breakdown 14 Showing our :newbee” Cameron how easy it is to break hardened steel, drop your cam shaft and see what happens  Motor breakdown 10 Then you say, “how could you DROP such an important part?”  While it’s true they look pretty cool and is very unique there really isn’t anything you can do with it.  The new cam will be a billet roller cam so this “motor program” is in “DOS” and needs to be turned off!  

This core was found and brought to us by Drew Koba…thanks brother for this fine original, little wear no trauma core!  So we have Drew’s moving stand which he cherishes and maybe soon we’ll find another core motor like this oneMotor breakdown 20  This is exactly why I want to build YOUR motor before it fails.  You know your motor, you know what it’s been subjected to.  Takes longer because the motor has to come out on the lift…pulled off the lift then re mounted on the lift…the lift can’t be down for 30-45 days but hey, we’re not looking to spend your money fast, I want quality work!  This motor will be built to our roller cam set up, “Kryptonite” cam….line bores, balance and made to pull 12,000 pound even better.  THIS is what you want to see.  This morot will replace one that failed under load, heated up and locked up….that motor needs to be relegated to some trailer queen somewhere is not a door stop for an aircraft hanger.  It’s no good for us!  This one is

So this motor will go to the machine shop now that WE know it’s what we want,  his work will be done, drew Koba will pick it up directly from the machinist where is will be professionally sized, cam degreed in and the motor built to a quality we want.  It will them come over like John I. motor did a few weeks ago, set up on our 1966 Toro front clip run in stand… fire that puppy up like John’s    Eidson motor 11  then that block….not this one, it will go into an awesome 1973, 23′ #214 I think that has that original Bargman latch I showed you last week  Eidson-ext.-6  JD is coming off the lift maybe today with his new FiTech fuel injection  JD finals 3  NOW he has FiTech and more….John’s motor, trans and FiTech is next….stay tuned……Eidson-awning-2

Hey, got it all out…8:07, gotta get out there….see ya tomorrow.

..

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Article by jimbounds / The Daily Pose

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